All SmartTools India Tool Guides

Calculators & maths

Percentage Calculator

Calculate a percentage of a number.

How to use it

1. Decide which amount is the base, which value is the rate, and whether you need a tax-inclusive total, a difference or a percentage change; Percentage Calculator can answer only the calculation represented by its inputs.
2. Enter values in the units shown and check whether the rate is entered as a percent (for example, 18) or a decimal (0.18). Do not mix the two formats.
3. Verify the output with the worked example and recompute the result using the displayed rate. For tax or payroll decisions, confirm the applicable current rules separately.

Example and verification

Example: Enter 15 as the percentage and 800 as the base amount. The result should be 120 because 0.15 × 800 = 120.

Check whether the question asks for a percentage of an amount, a percentage change or one value as a percentage of another; these use different calculations.

Open the detailed worked guide for Percentage Calculator →

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Calculators & maths

Ratio Calculator

Simplify ratios and find proportional values.

How to use it

1. Enter the exact numbers or symbols required by Ratio Calculator and check the operation or convention selected before calculating.
2. Use the worked example to verify the arithmetic, signs, order of operations and whether the result is simplified, rounded or expressed in a different representation.
3. Try a second small test case, including zero, negative or boundary values only where the tool supports them, and compare with an independent calculation.

Example and verification

Example: Enter 12 and 18. A simplified ratio is 2:3 because both values divide by 6.

Ratios describe relative quantities; keep the order of the two values consistent with the real problem.

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Calculators & maths

Fraction Calculator

Add, subtract, multiply and divide fractions.

How to use it

1. Enter the exact numbers or symbols required by Fraction Calculator and check the operation or convention selected before calculating.
2. Use the worked example to verify the arithmetic, signs, order of operations and whether the result is simplified, rounded or expressed in a different representation.
3. Try a second small test case, including zero, negative or boundary values only where the tool supports them, and compare with an independent calculation.

Example and verification

Example: Add 1/2 and 1/3. The expected result is 5/6 because 3/6 + 2/6 = 5/6.

Check signs and denominators carefully. A fraction result may be simplified or displayed as a decimal depending on the tool.

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Calculators & maths

Average Calculator

Find mean, median and range of numbers.

How to use it

1. Enter the complete date/time values requested by Average Calculator and confirm the displayed date format, timezone and whether the end date is included.
2. Check edge cases such as month ends, leap years, daylight-saving changes or weekends where relevant; these can change calendar-based results.
3. Test the result with a known date pair and compare the displayed units (days, weeks, months or years) with the question you need to answer.

Example and verification

Example: For 4, 6 and 8, the mean is 6, the median is 6 and the range is 4.

Mean, median and range describe different things; check which statistic the task requires and whether all values were included.

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Calculators & maths

Number to Words

Convert numbers into English words.

How to use it

1. Paste a small, non-sensitive sample into Number to Words first and check what the tool treats as a word, line, character or encoded value.
2. Compare the output with a manual check on the sample, especially for spaces, line breaks, punctuation, Unicode characters and empty lines.
3. Only process text you are allowed to use; avoid pasting passwords, private keys, personal records or confidential documents. Copy or download the result and check it before using it elsewhere.

Example and verification

Example: Enter 125. The English words should read “one hundred twenty-five” (wording may vary by locale).

For cheque, invoice or legal use, check local number-word conventions and punctuation before copying the result.

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Calculators & maths

GPA Calculator

Calculate weighted GPA from grades and credits.

How to use it

1. Enter the exact numbers or symbols required by GPA Calculator and check the operation or convention selected before calculating.
2. Use the worked example to verify the arithmetic, signs, order of operations and whether the result is simplified, rounded or expressed in a different representation.
3. Try a second small test case, including zero, negative or boundary values only where the tool supports them, and compare with an independent calculation.

Example and verification

Example: For a weighted example, 4 grade points over 3 credits and 3 grade points over 1 credit gives (4×3 + 3×1) ÷ 4 = 3.75.

Grade scales and weighting rules differ between schools. Use the scale and credit rules supplied by your institution.

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Money & finance

Discount Calculator

Find savings and final sale price.

How to use it

1. Decide which amount is the base, which value is the rate, and whether you need a tax-inclusive total, a difference or a percentage change; Discount Calculator can answer only the calculation represented by its inputs.
2. Enter values in the units shown and check whether the rate is entered as a percent (for example, 18) or a decimal (0.18). Do not mix the two formats.
3. Verify the output with the worked example and recompute the result using the displayed rate. For tax or payroll decisions, confirm the applicable current rules separately.

Example and verification

Example: For an original price of ₹1,000 and a 20% discount, the saving is ₹200 and the price before any additional taxes or fees is ₹800.

Confirm whether the entered price already includes tax, delivery or other charges.

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Money & finance

GST Calculator

Add or remove GST from an amount.

How to use it

1. Decide which amount is the base, which value is the rate, and whether you need a tax-inclusive total, a difference or a percentage change; GST Calculator can answer only the calculation represented by its inputs.
2. Enter values in the units shown and check whether the rate is entered as a percent (for example, 18) or a decimal (0.18). Do not mix the two formats.
3. Verify the output with the worked example and recompute the result using the displayed rate. For tax or payroll decisions, confirm the applicable current rules separately.

Example and verification

Example: At an illustrative 18% rate, GST on ₹1,000 before tax is ₹180 and the tax-inclusive total is ₹1,180. Removing 18% from an inclusive amount is a different calculation.

Use the rate and treatment that apply to the actual goods, service and transaction; this example is not tax advice.

Open the detailed worked guide for GST Calculator →

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Money & finance

EMI Calculator

Estimate monthly loan payment and interest.

How to use it

1. Enter the amount, rate and time period requested by EMI Calculator; make sure the rate period matches the calculator's period (for example, annual rate versus monthly payments).
2. Check whether the result is an estimate and whether fees, taxes, deposits, compounding or changing rates are excluded.
3. Compare the displayed result with the worked example and a separate calculation. For borrowing or investing, verify assumptions against the lender/provider and remember that projections are not guarantees.

Example and verification

Example: For ₹1,00,000 borrowed for 12 months at a nominal 12% annual rate, a monthly-rate estimate is about ₹8,884.88 before fees.

Actual lender schedules may include fees, insurance, different compounding conventions or rate changes. Verify with the lender.

Open the detailed worked guide for EMI Calculator →

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Money & finance

Simple Interest

Calculate simple interest and maturity amount.

How to use it

1. Enter the amount, rate and time period requested by Simple Interest; make sure the rate period matches the calculator's period (for example, annual rate versus monthly payments).
2. Check whether the result is an estimate and whether fees, taxes, deposits, compounding or changing rates are excluded.
3. Compare the displayed result with the worked example and a separate calculation. For borrowing or investing, verify assumptions against the lender/provider and remember that projections are not guarantees.

Example and verification

Example: For principal ₹10,000 at 5% simple annual interest for 2 years, interest is ₹1,000 and the total is ₹11,000.

Simple interest does not add earned interest back to the principal; do not use it when the agreement specifies compounding.

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Money & finance

Compound Interest

Calculate compound growth over time.

How to use it

1. Enter the amount, rate and time period requested by Compound Interest; make sure the rate period matches the calculator's period (for example, annual rate versus monthly payments).
2. Check whether the result is an estimate and whether fees, taxes, deposits, compounding or changing rates are excluded.
3. Compare the displayed result with the worked example and a separate calculation. For borrowing or investing, verify assumptions against the lender/provider and remember that projections are not guarantees.

Example and verification

Example: ₹10,000 compounded annually at 5% for 2 years becomes ₹11,025 before taxes or fees: 10,000 × 1.05².

The outcome depends on compounding frequency, deposits, withdrawals, fees and taxes; an estimate is not a guaranteed return.

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Money & finance

Salary Calculator

Convert monthly salary into annual income.

How to use it

1. Decide which amount is the base, which value is the rate, and whether you need a tax-inclusive total, a difference or a percentage change; Salary Calculator can answer only the calculation represented by its inputs.
2. Enter values in the units shown and check whether the rate is entered as a percent (for example, 18) or a decimal (0.18). Do not mix the two formats.
3. Verify the output with the worked example and recompute the result using the displayed rate. For tax or payroll decisions, confirm the applicable current rules separately.

Example and verification

Example: If gross monthly salary is ₹25,000 and it stays constant for 12 months, gross annual salary is ₹3,00,000 before deductions and variable pay.

Gross salary is not take-home pay. Check deductions, bonuses, benefits and payroll rules separately.

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Money & finance

Tip Calculator

Split a bill and calculate tip per person.

How to use it

1. Decide which amount is the base, which value is the rate, and whether you need a tax-inclusive total, a difference or a percentage change; Tip Calculator can answer only the calculation represented by its inputs.
2. Enter values in the units shown and check whether the rate is entered as a percent (for example, 18) or a decimal (0.18). Do not mix the two formats.
3. Verify the output with the worked example and recompute the result using the displayed rate. For tax or payroll decisions, confirm the applicable current rules separately.

Example and verification

Example: On a ₹1,200 bill, a 10% tip is ₹120. If three people split the ₹1,320 total equally, each pays ₹440.

Confirm whether the service charge is already included and how the group wants to split the bill.

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Money & finance

Profit & Loss Calculator

Calculate profit, loss and percentages.

How to use it

1. Decide which amount is the base, which value is the rate, and whether you need a tax-inclusive total, a difference or a percentage change; Profit & Loss Calculator can answer only the calculation represented by its inputs.
2. Enter values in the units shown and check whether the rate is entered as a percent (for example, 18) or a decimal (0.18). Do not mix the two formats.
3. Verify the output with the worked example and recompute the result using the displayed rate. For tax or payroll decisions, confirm the applicable current rules separately.

Example and verification

Example: If an item costs ₹800 and sells for ₹1,000, profit is ₹200. That is 25% of cost, or a 20% margin on the selling price.

Profit percentage on cost and profit margin on selling price are not the same measure.

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Money & finance

SIP Calculator

Estimate SIP maturity and invested amount.

How to use it

1. Enter the amount, rate and time period requested by SIP Calculator; make sure the rate period matches the calculator's period (for example, annual rate versus monthly payments).
2. Check whether the result is an estimate and whether fees, taxes, deposits, compounding or changing rates are excluded.
3. Compare the displayed result with the worked example and a separate calculation. For borrowing or investing, verify assumptions against the lender/provider and remember that projections are not guarantees.

Example and verification

Example: A contribution of ₹1,000 each month for 12 months totals ₹12,000 invested before returns, charges or taxes.

Any projected maturity value depends on the assumed return and is not guaranteed. Market-linked investments can lose value.

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Money & finance

Currency Converter

Convert common currencies with editable rates.

How to use it

1. Enter the amount, rate and time period requested by Currency Converter; make sure the rate period matches the calculator's period (for example, annual rate versus monthly payments).
2. Check whether the result is an estimate and whether fees, taxes, deposits, compounding or changing rates are excluded.
3. Compare the displayed result with the worked example and a separate calculation. For borrowing or investing, verify assumptions against the lender/provider and remember that projections are not guarantees.

Example and verification

Example: If you enter an illustrative rate of ₹83 for US$1, then US$10 converts to ₹830. Use the rate displayed or entered in the tool.

This example rate is only for arithmetic. Exchange rates change and providers may add spreads or fees; confirm the rate source and date.

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Converters

Unit Converter

Convert common units in one place.

How to use it

1. Select the source and destination units that describe the same physical quantity in Unit Converter; check prefixes such as milli-, kilo- and mega- before converting.
2. Enter the value without changing its unit label, then check the result's unit as well as its number. Temperature conversions use offsets, unlike simple scale-factor conversions.
3. Convert the result back to the original unit as a quick check and compare rounding with the precision required by your task.

Example and verification

Example: Convert 2.5 kilometres to metres: 2.5 × 1,000 = 2,500 metres.

Check that source and destination units measure the same quantity and that the correct unit prefix is selected.

Open the detailed worked guide for Unit Converter →

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Converters

Temperature Converter

Convert Celsius, Fahrenheit and Kelvin.

How to use it

1. Select the source and destination units that describe the same physical quantity in Temperature Converter; check prefixes such as milli-, kilo- and mega- before converting.
2. Enter the value without changing its unit label, then check the result's unit as well as its number. Temperature conversions use offsets, unlike simple scale-factor conversions.
3. Convert the result back to the original unit as a quick check and compare rounding with the precision required by your task.

Example and verification

Example: 0°C equals 32°F and 273.15 K. Convert back to Celsius to check the unit selection.

Temperature conversions use offsets as well as scale factors; do not treat them like ordinary length conversions.

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Converters

Length Converter

Convert km, m, cm, mm, miles and more.

How to use it

1. Select the source and destination units that describe the same physical quantity in Length Converter; check prefixes such as milli-, kilo- and mega- before converting.
2. Enter the value without changing its unit label, then check the result's unit as well as its number. Temperature conversions use offsets, unlike simple scale-factor conversions.
3. Convert the result back to the original unit as a quick check and compare rounding with the precision required by your task.

Example and verification

Example: 5 kilometres equals 5,000 metres. For miles, 5 km is approximately 3.11 miles.

Keep enough decimal places for the task and check whether the requested unit is metric or customary.

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Converters

Weight Converter

Convert kg, g, lb and oz.

How to use it

1. Select the source and destination units that describe the same physical quantity in Weight Converter; check prefixes such as milli-, kilo- and mega- before converting.
2. Enter the value without changing its unit label, then check the result's unit as well as its number. Temperature conversions use offsets, unlike simple scale-factor conversions.
3. Convert the result back to the original unit as a quick check and compare rounding with the precision required by your task.

Example and verification

Example: 2 kilograms equals 2,000 grams, or approximately 4.409 pounds.

Mass and force are different physical quantities; confirm what the source label means in the context you are using.

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Converters

Area Converter

Convert square meters, feet, acres and more.

How to use it

1. Select the source and destination units that describe the same physical quantity in Area Converter; check prefixes such as milli-, kilo- and mega- before converting.
2. Enter the value without changing its unit label, then check the result's unit as well as its number. Temperature conversions use offsets, unlike simple scale-factor conversions.
3. Convert the result back to the original unit as a quick check and compare rounding with the precision required by your task.

Example and verification

Example: A rectangle 5 metres long and 4 metres wide has an area of 20 square metres. One square metre is about 10.764 square feet.

Area units are squared units; do not convert metres to feet and forget to square the conversion factor.

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Converters

Volume Converter

Convert liters, ml, gallons and more.

How to use it

1. Select the source and destination units that describe the same physical quantity in Volume Converter; check prefixes such as milli-, kilo- and mega- before converting.
2. Enter the value without changing its unit label, then check the result's unit as well as its number. Temperature conversions use offsets, unlike simple scale-factor conversions.
3. Convert the result back to the original unit as a quick check and compare rounding with the precision required by your task.

Example and verification

Example: 1 litre equals 1,000 millilitres. A 2.5-litre container therefore holds 2,500 millilitres.

US and imperial gallons are different sizes. Check which gallon standard the tool uses.

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Converters

Speed Converter

Convert km/h, mph and m/s.

How to use it

1. Select the source and destination units that describe the same physical quantity in Speed Converter; check prefixes such as milli-, kilo- and mega- before converting.
2. Enter the value without changing its unit label, then check the result's unit as well as its number. Temperature conversions use offsets, unlike simple scale-factor conversions.
3. Convert the result back to the original unit as a quick check and compare rounding with the precision required by your task.

Example and verification

Example: 60 km/h is approximately 16.67 m/s. Convert back to check the selected units.

A speed conversion does not account for travel conditions, safety or legal speed limits.

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Converters

Time Converter

Convert seconds, minutes, hours and days.

How to use it

1. Select the source and destination units that describe the same physical quantity in Time Converter; check prefixes such as milli-, kilo- and mega- before converting.
2. Enter the value without changing its unit label, then check the result's unit as well as its number. Temperature conversions use offsets, unlike simple scale-factor conversions.
3. Convert the result back to the original unit as a quick check and compare rounding with the precision required by your task.

Example and verification

Example: 2.5 hours equals 150 minutes or 9,000 seconds.

Confirm whether the input is a duration or a clock time; they are not interchangeable.

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Converters

Data Storage Converter

Convert bytes, KB, MB, GB and TB.

How to use it

1. Select the source and destination units that describe the same physical quantity in Data Storage Converter; check prefixes such as milli-, kilo- and mega- before converting.
2. Enter the value without changing its unit label, then check the result's unit as well as its number. Temperature conversions use offsets, unlike simple scale-factor conversions.
3. Convert the result back to the original unit as a quick check and compare rounding with the precision required by your task.

Example and verification

Example: Using decimal units, 1 MB = 1,000 KB; using binary units, 1 MiB = 1,024 KiB.

Storage manufacturers and operating systems may use different unit conventions. Check whether the tool uses decimal or binary units.

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Text tools

Word Counter

Count words, characters, lines and sentences.

How to use it

1. Paste a small, non-sensitive sample into Word Counter first and check what the tool treats as a word, line, character or encoded value.
2. Compare the output with a manual check on the sample, especially for spaces, line breaks, punctuation, Unicode characters and empty lines.
3. Only process text you are allowed to use; avoid pasting passwords, private keys, personal records or confidential documents. Copy or download the result and check it before using it elsewhere.

Example and verification

Example: The text “Smart tools help.” contains 3 words. Character counts depend on whether spaces and punctuation are included.

Different platforms define words, lines and characters differently, especially for emojis, hyphenated terms and multiple spaces.

Open the detailed worked guide for Word Counter →

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Text tools

Case Converter

Change text to upper, lower, title or sentence case.

How to use it

1. Paste a small, non-sensitive sample into Case Converter first and check what the tool treats as a word, line, character or encoded value.
2. Compare the output with a manual check on the sample, especially for spaces, line breaks, punctuation, Unicode characters and empty lines.
3. Only process text you are allowed to use; avoid pasting passwords, private keys, personal records or confidential documents. Copy or download the result and check it before using it elsewhere.

Example and verification

Example: Convert “smart tools india” to uppercase to get “SMART TOOLS INDIA”; use title case only if that is the style you need.

Automatic case conversion may not preserve every proper noun or language-specific capitalization rule.

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Text tools

Remove Extra Spaces

Clean repeated whitespace from text.

How to use it

1. Enter the measurements and units requested by Remove Extra Spaces; check that height, mass, age, activity level and other inputs use the intended units and categories.
2. Treat the output as a general estimate, not a diagnosis or a personal medical prescription. Individual needs can differ from formula assumptions.
3. Repeat the calculation with the inputs checked for typing errors and discuss health decisions with a qualified clinician or dietitian when appropriate.

Example and verification

Example: Input “ hello world ” and check whether the result is “hello world” with outer and repeated spaces removed.

If spacing is meaningful in code, poetry or fixed-width text, keep a copy of the original before cleaning.

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Text tools

URL Slug Generator

Create clean URL slugs from titles.

How to use it

1. Paste a small, non-sensitive sample into URL Slug Generator first and check what the tool treats as a word, line, character or encoded value.
2. Compare the output with a manual check on the sample, especially for spaces, line breaks, punctuation, Unicode characters and empty lines.
3. Only process text you are allowed to use; avoid pasting passwords, private keys, personal records or confidential documents. Copy or download the result and check it before using it elsewhere.

Example and verification

Example: A title such as “How to Use a GST Calculator” can become “how-to-use-a-gst-calculator”.

Before publishing a replacement URL, check existing links and redirects; changing a live slug can break links.

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Text tools

Reverse Text

Reverse text instantly.

How to use it

1. Paste a small, non-sensitive sample into Reverse Text first and check what the tool treats as a word, line, character or encoded value.
2. Compare the output with a manual check on the sample, especially for spaces, line breaks, punctuation, Unicode characters and empty lines.
3. Only process text you are allowed to use; avoid pasting passwords, private keys, personal records or confidential documents. Copy or download the result and check it before using it elsewhere.

Example and verification

Example: Reversing “tools” should produce “sloot” when characters are reversed.

Character reversal is not the same as reversing words or sentence order.

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Text tools

Sort Lines

Sort text lines alphabetically.

How to use it

1. Paste a small, non-sensitive sample into Sort Lines first and check what the tool treats as a word, line, character or encoded value.
2. Compare the output with a manual check on the sample, especially for spaces, line breaks, punctuation, Unicode characters and empty lines.
3. Only process text you are allowed to use; avoid pasting passwords, private keys, personal records or confidential documents. Copy or download the result and check it before using it elsewhere.

Example and verification

Example: Input three lines: “pear”, “apple”, “banana”. Alphabetical ascending order should be apple, banana, pear.

Check whether sorting is case-sensitive and whether blank lines should be kept.

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Text tools

Find & Replace

Replace text across a pasted block.

How to use it

1. Paste a small, non-sensitive sample into Find & Replace first and check what the tool treats as a word, line, character or encoded value.
2. Compare the output with a manual check on the sample, especially for spaces, line breaks, punctuation, Unicode characters and empty lines.
3. Only process text you are allowed to use; avoid pasting passwords, private keys, personal records or confidential documents. Copy or download the result and check it before using it elsewhere.

Example and verification

Example: In “red blue red”, find “red” and replace it with “green”; review whether both matches were changed.

Review every replacement before using it in a document; broad matches can alter words you did not intend to change.

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Text tools

Duplicate Line Remover

Remove duplicate lines from text.

How to use it

1. Paste a small, non-sensitive sample into Duplicate Line Remover first and check what the tool treats as a word, line, character or encoded value.
2. Compare the output with a manual check on the sample, especially for spaces, line breaks, punctuation, Unicode characters and empty lines.
3. Only process text you are allowed to use; avoid pasting passwords, private keys, personal records or confidential documents. Copy or download the result and check it before using it elsewhere.

Example and verification

Example: For lines “apple”, “pear”, “apple”, the unique-line output should contain apple and pear once each.

Check whether duplicate matching is case-sensitive and whether the first occurrence or original order is preserved.

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Text tools

Lorem Ipsum Generator

Generate placeholder text quickly.

How to use it

1. Paste a small, non-sensitive sample into Lorem Ipsum Generator first and check what the tool treats as a word, line, character or encoded value.
2. Compare the output with a manual check on the sample, especially for spaces, line breaks, punctuation, Unicode characters and empty lines.
3. Only process text you are allowed to use; avoid pasting passwords, private keys, personal records or confidential documents. Copy or download the result and check it before using it elsewhere.

Example and verification

Example: Generate placeholder text for a draft layout, then replace it with real copy before publishing.

Placeholder text is not finished content and should not be left on a live page.

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Date & time

Age Calculator

Find age in years, months and days.

How to use it

1. Enter the complete date/time values requested by Age Calculator and confirm the displayed date format, timezone and whether the end date is included.
2. Check edge cases such as month ends, leap years, daylight-saving changes or weekends where relevant; these can change calendar-based results.
3. Test the result with a known date pair and compare the displayed units (days, weeks, months or years) with the question you need to answer.

Example and verification

Example: Enter a birth date and a reference date to calculate the elapsed years, months and days. Check that the reference date is the one you intended.

Date results depend on the reference date, time zone and calendar rules. Use this as a date calculation, not as an identity or eligibility check.

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Date & time

Date Difference

Count days between two dates.

How to use it

1. Enter the complete date/time values requested by Date Difference and confirm the displayed date format, timezone and whether the end date is included.
2. Check edge cases such as month ends, leap years, daylight-saving changes or weekends where relevant; these can change calendar-based results.
3. Test the result with a known date pair and compare the displayed units (days, weeks, months or years) with the question you need to answer.

Example and verification

Example: The difference between 1 October and 8 October is 7 elapsed days; inclusive counting may give a different answer.

Check whether the task needs elapsed days or inclusive counting, and whether the end date should be included.

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Date & time

Add/Subtract Days

Move forward or backward from a date.

How to use it

1. Enter the complete date/time values requested by Add/Subtract Days and confirm the displayed date format, timezone and whether the end date is included.
2. Check edge cases such as month ends, leap years, daylight-saving changes or weekends where relevant; these can change calendar-based results.
3. Test the result with a known date pair and compare the displayed units (days, weeks, months or years) with the question you need to answer.

Example and verification

Example: Starting from 15 January 2026, adding 10 days gives 25 January 2026.

Month boundaries and leap years matter; check the displayed resulting date rather than estimating mentally.

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Date & time

Time Difference

Calculate duration between two times.

How to use it

1. Enter the complete date/time values requested by Time Difference and confirm the displayed date format, timezone and whether the end date is included.
2. Check edge cases such as month ends, leap years, daylight-saving changes or weekends where relevant; these can change calendar-based results.
3. Test the result with a known date pair and compare the displayed units (days, weeks, months or years) with the question you need to answer.

Example and verification

Example: From 09:15 to 10:45 is 1 hour 30 minutes when both times are on the same day.

For overnight shifts, confirm that the tool supports crossing midnight and that the correct date or AM/PM is selected.

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Date & time

Day of Week

Find the weekday for any date.

How to use it

1. Enter the complete date/time values requested by Day of Week and confirm the displayed date format, timezone and whether the end date is included.
2. Check edge cases such as month ends, leap years, daylight-saving changes or weekends where relevant; these can change calendar-based results.
3. Test the result with a known date pair and compare the displayed units (days, weeks, months or years) with the question you need to answer.

Example and verification

Example: 1 January 2026 falls on a Thursday. Check the displayed calendar date and weekday together.

Date formats such as DD/MM and MM/DD can be ambiguous; enter the date in the format shown by the tool.

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Date & time

Week Number

Find ISO week number for a date.

How to use it

1. Enter the complete date/time values requested by Week Number and confirm the displayed date format, timezone and whether the end date is included.
2. Check edge cases such as month ends, leap years, daylight-saving changes or weekends where relevant; these can change calendar-based results.
3. Test the result with a known date pair and compare the displayed units (days, weeks, months or years) with the question you need to answer.

Example and verification

Example: The ISO week number can differ from a simple count of weeks since 1 January, especially around New Year.

Check that you need ISO week numbering; some organisations use different week-start and week-one rules.

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Date & time

Countdown Calculator

Calculate time remaining to a target date.

How to use it

1. Enter the complete date/time values requested by Countdown Calculator and confirm the displayed date format, timezone and whether the end date is included.
2. Check edge cases such as month ends, leap years, daylight-saving changes or weekends where relevant; these can change calendar-based results.
3. Test the result with a known date pair and compare the displayed units (days, weeks, months or years) with the question you need to answer.

Example and verification

Example: Choose a future date and time and compare the remaining days and hours with your calendar.

Countdowns depend on the selected time zone and target time. Recheck the target before relying on a deadline.

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Health & fitness estimates

BMI Calculator

Calculate body mass index from height and weight.

How to use it

1. Enter the measurements and units requested by BMI Calculator; check that height, mass, age, activity level and other inputs use the intended units and categories.
2. Treat the output as a general estimate, not a diagnosis or a personal medical prescription. Individual needs can differ from formula assumptions.
3. Repeat the calculation with the inputs checked for typing errors and discuss health decisions with a qualified clinician or dietitian when appropriate.

Example and verification

Example: For a mathematical check only, 70 kg and 1.75 m gives BMI = 70 ÷ (1.75²) ≈ 22.9.

BMI is a limited screening measure, not a diagnosis or a complete assessment of health; interpretation differs by age and context.

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Health & fitness estimates

BMR Calculator

Estimate basal metabolic rate.

How to use it

1. Enter the measurements and units requested by BMR Calculator; check that height, mass, age, activity level and other inputs use the intended units and categories.
2. Treat the output as a general estimate, not a diagnosis or a personal medical prescription. Individual needs can differ from formula assumptions.
3. Repeat the calculation with the inputs checked for typing errors and discuss health decisions with a qualified clinician or dietitian when appropriate.

Example and verification

Example: Enter the required age, height, weight and other requested details, then compare the estimate with the formula or source stated by the tool.

BMR equations are estimates and may not reflect an individual’s needs. Do not use this number alone to make health decisions.

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Health & fitness estimates

Calorie Needs

Estimate daily calorie needs from activity.

How to use it

1. Enter the measurements and units requested by Calorie Needs; check that height, mass, age, activity level and other inputs use the intended units and categories.
2. Treat the output as a general estimate, not a diagnosis or a personal medical prescription. Individual needs can differ from formula assumptions.
3. Repeat the calculation with the inputs checked for typing errors and discuss health decisions with a qualified clinician or dietitian when appropriate.

Example and verification

Example: Try the same sample inputs with two different activity settings and observe how the estimate changes.

Energy needs vary by person, age, health and activity. Treat the result as a rough estimate, not a strict eating target.

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Health & fitness estimates

Running Pace Calculator

Calculate pace from distance and time.

How to use it

1. Enter the measurements and units requested by Running Pace Calculator; check that height, mass, age, activity level and other inputs use the intended units and categories.
2. Treat the output as a general estimate, not a diagnosis or a personal medical prescription. Individual needs can differ from formula assumptions.
3. Repeat the calculation with the inputs checked for typing errors and discuss health decisions with a qualified clinician or dietitian when appropriate.

Example and verification

Example: If a run covers 5 km in 30 minutes, average pace is 6 minutes per kilometre.

Check that distance and time use compatible units and treat pace as a calculation, not a medical or training prescription.

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Developer & data tools

Password Generator

Generate strong passwords locally.

How to use it

1. Paste a small, non-sensitive sample into Password Generator first and check what the tool treats as a word, line, character or encoded value.
2. Compare the output with a manual check on the sample, especially for spaces, line breaks, punctuation, Unicode characters and empty lines.
3. Only process text you are allowed to use; avoid pasting passwords, private keys, personal records or confidential documents. Copy or download the result and check it before using it elsewhere.

Example and verification

Example: Choose a length and character options, generate a password, and save it directly in a trusted password manager rather than sharing it.

Do not post generated passwords in screenshots or messages. A password generator does not replace unique passwords and multi-factor authentication.

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Developer & data tools

UUID Generator

Generate UUID v4 identifiers.

How to use it

1. Choose the options that match your intended output in UUID Generator, then use a small test input before processing a larger file or generating a final result.
2. Check the output format, file extension, dimensions or selection rules. If randomness is involved, a new output may differ each time.
3. Open or validate the generated output before sharing it. Do not treat a QR code as trustworthy until its destination has been checked, and do not upload confidential files unless you understand how they are processed.

Example and verification

Example: Generate a UUID and check that it follows the familiar 8-4-4-4-12 hexadecimal group format for UUID v4.

A UUID is an identifier, not an access credential. Check whether your system needs a particular UUID version.

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Developer & data tools

Base64 Encoder / Decoder

Encode or decode Base64 text.

How to use it

1. Paste a small, non-sensitive sample into Base64 Encoder / Decoder first and check what the tool treats as a word, line, character or encoded value.
2. Compare the output with a manual check on the sample, especially for spaces, line breaks, punctuation, Unicode characters and empty lines.
3. Only process text you are allowed to use; avoid pasting passwords, private keys, personal records or confidential documents. Copy or download the result and check it before using it elsewhere.

Example and verification

Example: The text “Hello” encodes to “SGVsbG8=” in Base64. Decoding that value should return “Hello”.

Base64 is an encoding format, not encryption; never treat encoded data as secret.

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Developer & data tools

JSON Formatter

Format and validate JSON.

How to use it

1. Paste a small, non-sensitive sample into JSON Formatter first and check what the tool treats as a word, line, character or encoded value.
2. Compare the output with a manual check on the sample, especially for spaces, line breaks, punctuation, Unicode characters and empty lines.
3. Only process text you are allowed to use; avoid pasting passwords, private keys, personal records or confidential documents. Copy or download the result and check it before using it elsewhere.

Example and verification

Example: Format {"name":"Asha","age":20} and confirm that the output is valid JSON with quoted property names and balanced braces.

Formatting does not make data correct or safe. Validate the structure and avoid pasting private tokens or personal records.

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Developer & data tools

Text ↔ Binary

Convert text to binary and back.

How to use it

1. Paste a small, non-sensitive sample into Text ↔ Binary first and check what the tool treats as a word, line, character or encoded value.
2. Compare the output with a manual check on the sample, especially for spaces, line breaks, punctuation, Unicode characters and empty lines.
3. Only process text you are allowed to use; avoid pasting passwords, private keys, personal records or confidential documents. Copy or download the result and check it before using it elsewhere.

Example and verification

Example: The text “A” is represented by the 8-bit ASCII/UTF-8 byte 01000001. Check whether the tool expects text or a numeric value.

Text encodings and byte widths matter for non-ASCII characters; confirm the format before exchanging data.

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Developer & data tools

URL Encoder / Decoder

Encode or decode URL components.

How to use it

1. Paste a small, non-sensitive sample into URL Encoder / Decoder first and check what the tool treats as a word, line, character or encoded value.
2. Compare the output with a manual check on the sample, especially for spaces, line breaks, punctuation, Unicode characters and empty lines.
3. Only process text you are allowed to use; avoid pasting passwords, private keys, personal records or confidential documents. Copy or download the result and check it before using it elsewhere.

Example and verification

Example: Encoding “hello world” as a URL component commonly produces “hello%20world”. Decode it to verify the original text.

Encode URL components rather than blindly encoding an entire URL; reserved characters may have structural meaning.

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Developer & data tools

HTML Entity Encoder

Escape HTML special characters.

How to use it

1. Paste a small, non-sensitive sample into HTML Entity Encoder first and check what the tool treats as a word, line, character or encoded value.
2. Compare the output with a manual check on the sample, especially for spaces, line breaks, punctuation, Unicode characters and empty lines.
3. Only process text you are allowed to use; avoid pasting passwords, private keys, personal records or confidential documents. Copy or download the result and check it before using it elsewhere.

Example and verification

Example: Escaping “<b>Hello</b>” should represent the angle brackets as entities when the goal is to display the markup as text.

HTML escaping is context-dependent. It does not replace a full security review when inserting untrusted content into a webpage.

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Developer & data tools

Unix Timestamp

Convert Unix timestamps and dates.

How to use it

1. Use a small test value in Unix Timestamp and check the expected input format before processing real data.
2. Inspect the result for escaping, parsing, precision or formatting changes; valid output for one format may not be valid for another.
3. Test a normal case and a malformed or boundary case, and validate the result with the destination application or a trusted parser before relying on it.

Example and verification

Example: Unix timestamp 0 corresponds to 1 January 1970 at 00:00:00 UTC. Confirm whether the tool expects seconds or milliseconds.

Time zones and seconds-versus-milliseconds are common sources of errors; check the unit and UTC/local display.

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Developer & data tools

Color Converter

Convert HEX, RGB and HSL basics.

How to use it

1. Choose the options that match your intended output in Color Converter, then use a small test input before processing a larger file or generating a final result.
2. Check the output format, file extension, dimensions or selection rules. If randomness is involved, a new output may differ each time.
3. Open or validate the generated output before sharing it. Do not treat a QR code as trustworthy until its destination has been checked, and do not upload confidential files unless you understand how they are processed.

Example and verification

Example: HEX #FFFFFF corresponds to RGB(255, 255, 255), which is white. Convert back to check rounding.

Screen appearance can vary by display and color profile; check contrast and accessibility separately.

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Developer & data tools

Text Hash

Create SHA-256 hashes in the browser.

How to use it

1. Paste a small, non-sensitive sample into Text Hash first and check what the tool treats as a word, line, character or encoded value.
2. Compare the output with a manual check on the sample, especially for spaces, line breaks, punctuation, Unicode characters and empty lines.
3. Only process text you are allowed to use; avoid pasting passwords, private keys, personal records or confidential documents. Copy or download the result and check it before using it elsewhere.

Example and verification

Example: Hash the sample text “hello” twice using SHA-256 and confirm that the same exact input gives the same digest.

A hash is not encryption and does not prove who created a file. Do not use a plain hash as a password-storage system.

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Developer & data tools

JSON Minifier

Minify valid JSON into one line.

How to use it

1. Paste a small, non-sensitive sample into JSON Minifier first and check what the tool treats as a word, line, character or encoded value.
2. Compare the output with a manual check on the sample, especially for spaces, line breaks, punctuation, Unicode characters and empty lines.
3. Only process text you are allowed to use; avoid pasting passwords, private keys, personal records or confidential documents. Copy or download the result and check it before using it elsewhere.

Example and verification

Example: Minify { "active": true, "count": 2 } and check that the result is still valid JSON with the same values.

Minification should remove unnecessary whitespace, not change the data. Keep a readable copy for editing.

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Developer & data tools

Regex Tester

Test a regular expression against text.

How to use it

1. Use a small test value in Regex Tester and check the expected input format before processing real data.
2. Inspect the result for escaping, parsing, precision or formatting changes; valid output for one format may not be valid for another.
3. Test a normal case and a malformed or boundary case, and validate the result with the destination application or a trusted parser before relying on it.

Example and verification

Example: Test a simple pattern such as ^cat$ against “cat” and “catalog”; only the exact “cat” string should match.

Regular-expression syntax varies by engine. Test expected matches and non-matches before using a pattern on important data.

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Developer & data tools

Markdown Preview

Preview basic Markdown-style text.

How to use it

1. Use a small test value in Markdown Preview and check the expected input format before processing real data.
2. Inspect the result for escaping, parsing, precision or formatting changes; valid output for one format may not be valid for another.
3. Test a normal case and a malformed or boundary case, and validate the result with the destination application or a trusted parser before relying on it.

Example and verification

Example: Enter “**Hello**” and check that the preview displays Hello in bold.

Markdown dialects differ; check the rendered preview and do not assume every platform supports the same syntax.

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Calculators & maths

Percent Change

Calculate percentage increase or decrease.

How to use it

1. Decide which amount is the base, which value is the rate, and whether you need a tax-inclusive total, a difference or a percentage change; Percent Change can answer only the calculation represented by its inputs.
2. Enter values in the units shown and check whether the rate is entered as a percent (for example, 18) or a decimal (0.18). Do not mix the two formats.
3. Verify the output with the worked example and recompute the result using the displayed rate. For tax or payroll decisions, confirm the applicable current rules separately.

Example and verification

Example: A value rising from 80 to 100 has a 25% increase: (100−80) ÷ 80 × 100.

The starting value is the denominator. Percentage change is undefined when the starting value is zero.

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Calculators & maths

GCD & LCM

Find greatest common divisor and least common multiple.

How to use it

1. Enter the exact numbers or symbols required by GCD & LCM and check the operation or convention selected before calculating.
2. Use the worked example to verify the arithmetic, signs, order of operations and whether the result is simplified, rounded or expressed in a different representation.
3. Try a second small test case, including zero, negative or boundary values only where the tool supports them, and compare with an independent calculation.

Example and verification

Example: For 12 and 18, the greatest common divisor is 6 and the least common multiple is 36.

Check that both inputs are valid integers if the tool expects whole numbers.

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Calculators & maths

Decimal ↔ Binary

Convert decimal and binary numbers.

How to use it

1. Paste a small, non-sensitive sample into Decimal ↔ Binary first and check what the tool treats as a word, line, character or encoded value.
2. Compare the output with a manual check on the sample, especially for spaces, line breaks, punctuation, Unicode characters and empty lines.
3. Only process text you are allowed to use; avoid pasting passwords, private keys, personal records or confidential documents. Copy or download the result and check it before using it elsewhere.

Example and verification

Example: Decimal 13 converts to binary 1101; converting 1101 back should return 13.

Leading zeroes may be removed during conversion. Signed numbers and fixed-width binary formats require separate rules.

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Calculators & maths

Roman Numeral Converter

Convert numbers to Roman numerals.

How to use it

1. Choose the options that match your intended output in Roman Numeral Converter, then use a small test input before processing a larger file or generating a final result.
2. Check the output format, file extension, dimensions or selection rules. If randomness is involved, a new output may differ each time.
3. Open or validate the generated output before sharing it. Do not treat a QR code as trustworthy until its destination has been checked, and do not upload confidential files unless you understand how they are processed.

Example and verification

Example: The number 2024 is written as MMXXIV in standard Roman numerals.

Roman numerals have conventional range and notation limits; verify unusual or very large values.

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Calculators & maths

Random Number

Generate a random number in a chosen range.

How to use it

1. Choose the options that match your intended output in Random Number, then use a small test input before processing a larger file or generating a final result.
2. Check the output format, file extension, dimensions or selection rules. If randomness is involved, a new output may differ each time.
3. Open or validate the generated output before sharing it. Do not treat a QR code as trustworthy until its destination has been checked, and do not upload confidential files unless you understand how they are processed.

Example and verification

Example: Set the range from 1 to 6 and generate several values; each result should stay within the selected inclusive range.

Random output is not a guarantee of fairness for security-critical, scientific or high-stakes uses.

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Calculators & maths

Prime Number Checker

Check whether an integer is prime.

How to use it

1. Enter the exact numbers or symbols required by Prime Number Checker and check the operation or convention selected before calculating.
2. Use the worked example to verify the arithmetic, signs, order of operations and whether the result is simplified, rounded or expressed in a different representation.
3. Try a second small test case, including zero, negative or boundary values only where the tool supports them, and compare with an independent calculation.

Example and verification

Example: 29 is prime because its only positive divisors are 1 and 29; 21 is not prime because 3 × 7 = 21.

Zero, one and negative integers are not prime numbers under the standard definition.

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Calculators & maths

Factorial Calculator

Calculate factorials for whole numbers.

How to use it

1. Enter the exact numbers or symbols required by Factorial Calculator and check the operation or convention selected before calculating.
2. Use the worked example to verify the arithmetic, signs, order of operations and whether the result is simplified, rounded or expressed in a different representation.
3. Try a second small test case, including zero, negative or boundary values only where the tool supports them, and compare with an independent calculation.

Example and verification

Example: 5! = 5 × 4 × 3 × 2 × 1 = 120.

Factorials grow quickly; very large inputs may exceed the precision or limits of a browser calculator.

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Calculators & maths

LCM Calculator

Find the least common multiple of two numbers.

How to use it

1. Enter the exact numbers or symbols required by LCM Calculator and check the operation or convention selected before calculating.
2. Use the worked example to verify the arithmetic, signs, order of operations and whether the result is simplified, rounded or expressed in a different representation.
3. Try a second small test case, including zero, negative or boundary values only where the tool supports them, and compare with an independent calculation.

Example and verification

Example: The least common multiple of 4 and 6 is 12, the smallest positive number divisible by both.

Check that the inputs are integers and that the result is interpreted as the smallest positive common multiple.

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Calculators & maths

Square Root Calculator

Calculate a square root.

How to use it

1. Enter the exact numbers or symbols required by Square Root Calculator and check the operation or convention selected before calculating.
2. Use the worked example to verify the arithmetic, signs, order of operations and whether the result is simplified, rounded or expressed in a different representation.
3. Try a second small test case, including zero, negative or boundary values only where the tool supports them, and compare with an independent calculation.

Example and verification

Example: The principal square root of 144 is 12 because 12 × 12 = 144.

For negative inputs, real-number square roots are not defined; check whether the tool supports complex values.

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Calculators & maths

Power Calculator

Calculate x raised to a power.

How to use it

1. Enter the exact numbers or symbols required by Power Calculator and check the operation or convention selected before calculating.
2. Use the worked example to verify the arithmetic, signs, order of operations and whether the result is simplified, rounded or expressed in a different representation.
3. Try a second small test case, including zero, negative or boundary values only where the tool supports them, and compare with an independent calculation.

Example and verification

Example: 2 raised to the power 5 is 32. Check the base and exponent order before calculating.

Large exponents can produce very large values or precision limits.

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Calculators & maths

Modulo Calculator

Find a division remainder.

How to use it

1. Enter the exact numbers or symbols required by Modulo Calculator and check the operation or convention selected before calculating.
2. Use the worked example to verify the arithmetic, signs, order of operations and whether the result is simplified, rounded or expressed in a different representation.
3. Try a second small test case, including zero, negative or boundary values only where the tool supports them, and compare with an independent calculation.

Example and verification

Example: 17 modulo 5 is 2 because 17 = 3 × 5 + 2.

Programming languages can treat negative remainders differently; check the convention if working with code.

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Calculators & maths

Permutation Calculator

Calculate nPr.

How to use it

1. Enter the exact numbers or symbols required by Permutation Calculator and check the operation or convention selected before calculating.
2. Use the worked example to verify the arithmetic, signs, order of operations and whether the result is simplified, rounded or expressed in a different representation.
3. Try a second small test case, including zero, negative or boundary values only where the tool supports them, and compare with an independent calculation.

Example and verification

Example: The number of ordered ways to choose 2 items from 5 is 5P2 = 5 × 4 = 20.

Permutations treat order as important; use combinations when order does not matter.

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Calculators & maths

Combination Calculator

Calculate nCr.

How to use it

1. Enter the exact numbers or symbols required by Combination Calculator and check the operation or convention selected before calculating.
2. Use the worked example to verify the arithmetic, signs, order of operations and whether the result is simplified, rounded or expressed in a different representation.
3. Try a second small test case, including zero, negative or boundary values only where the tool supports them, and compare with an independent calculation.

Example and verification

Example: The number of ways to choose 2 items from 5 without regard to order is 5C2 = 10.

Combinations treat selections with different order as the same group.

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Calculators & maths

Random List Picker

Pick a random item from a list.

How to use it

1. Choose the options that match your intended output in Random List Picker, then use a small test input before processing a larger file or generating a final result.
2. Check the output format, file extension, dimensions or selection rules. If randomness is involved, a new output may differ each time.
3. Open or validate the generated output before sharing it. Do not treat a QR code as trustworthy until its destination has been checked, and do not upload confidential files unless you understand how they are processed.

Example and verification

Example: Enter three non-sensitive options—apple, pear and mango—and confirm the tool returns one of the listed items.

A random picker is for casual selection, not a secure lottery, contest or high-stakes decision.

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Calculators & maths

Scientific Calculator

Evaluate basic math expressions.

How to use it

1. Enter the exact numbers or symbols required by Scientific Calculator and check the operation or convention selected before calculating.
2. Use the worked example to verify the arithmetic, signs, order of operations and whether the result is simplified, rounded or expressed in a different representation.
3. Try a second small test case, including zero, negative or boundary values only where the tool supports them, and compare with an independent calculation.

Example and verification

Example: In degree mode, sin(30°) equals 0.5. Switch to radians only when the problem uses radians.

Angle mode, parentheses and order of operations can change the answer; check them before trusting a result.

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Money & finance

Markup Calculator

Calculate markup and selling price.

How to use it

1. Decide which amount is the base, which value is the rate, and whether you need a tax-inclusive total, a difference or a percentage change; Markup Calculator can answer only the calculation represented by its inputs.
2. Enter values in the units shown and check whether the rate is entered as a percent (for example, 18) or a decimal (0.18). Do not mix the two formats.
3. Verify the output with the worked example and recompute the result using the displayed rate. For tax or payroll decisions, confirm the applicable current rules separately.

Example and verification

Example: If cost is ₹100 and markup is 25% of cost, the selling price before tax is ₹125.

Markup on cost and margin on selling price use different denominators; select the intended definition.

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Money & finance

Break-even Calculator

Find units needed to cover fixed costs.

How to use it

1. Enter the amount, rate and time period requested by Break-even Calculator; make sure the rate period matches the calculator's period (for example, annual rate versus monthly payments).
2. Check whether the result is an estimate and whether fees, taxes, deposits, compounding or changing rates are excluded.
3. Compare the displayed result with the worked example and a separate calculation. For borrowing or investing, verify assumptions against the lender/provider and remember that projections are not guarantees.

Example and verification

Example: With fixed costs of ₹10,000 and contribution of ₹50 per unit, break-even volume is 200 units (10,000 ÷ 50).

Use contribution per unit after variable costs, not the selling price alone. Real businesses may have changing costs.

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Money & finance

Commission Calculator

Calculate sales commission.

How to use it

1. Decide which amount is the base, which value is the rate, and whether you need a tax-inclusive total, a difference or a percentage change; Commission Calculator can answer only the calculation represented by its inputs.
2. Enter values in the units shown and check whether the rate is entered as a percent (for example, 18) or a decimal (0.18). Do not mix the two formats.
3. Verify the output with the worked example and recompute the result using the displayed rate. For tax or payroll decisions, confirm the applicable current rules separately.

Example and verification

Example: A 5% commission on ₹50,000 in eligible sales is ₹2,500 before deductions.

Check which sales qualify, whether returns are excluded and how the commission agreement defines the rate.

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Money & finance

Tax Percentage Calculator

Add percentage tax to a price.

How to use it

1. Decide which amount is the base, which value is the rate, and whether you need a tax-inclusive total, a difference or a percentage change; Tax Percentage Calculator can answer only the calculation represented by its inputs.
2. Enter values in the units shown and check whether the rate is entered as a percent (for example, 18) or a decimal (0.18). Do not mix the two formats.
3. Verify the output with the worked example and recompute the result using the displayed rate. For tax or payroll decisions, confirm the applicable current rules separately.

Example and verification

Example: If a taxable base is ₹1,000 and the illustrative tax rate is 10%, the tax amount is ₹100.

Actual tax rates and taxable bases depend on jurisdiction and transaction type; verify official rules.

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Money & finance

Hourly Rate Calculator

Estimate hourly pay from salary.

How to use it

1. Decide which amount is the base, which value is the rate, and whether you need a tax-inclusive total, a difference or a percentage change; Hourly Rate Calculator can answer only the calculation represented by its inputs.
2. Enter values in the units shown and check whether the rate is entered as a percent (for example, 18) or a decimal (0.18). Do not mix the two formats.
3. Verify the output with the worked example and recompute the result using the displayed rate. For tax or payroll decisions, confirm the applicable current rules separately.

Example and verification

Example: If gross monthly pay is ₹40,000 for 160 working hours, the simple average is ₹250 per hour before deductions.

This simple estimate excludes unpaid time, benefits, overtime and deductions; it may not equal a legal wage calculation.

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Converters

Miles to Kilometers

Convert miles to kilometers.

How to use it

1. Select the source and destination units that describe the same physical quantity in Miles to Kilometers; check prefixes such as milli-, kilo- and mega- before converting.
2. Enter the value without changing its unit label, then check the result's unit as well as its number. Temperature conversions use offsets, unlike simple scale-factor conversions.
3. Convert the result back to the original unit as a quick check and compare rounding with the precision required by your task.

Example and verification

Example: 10 miles is approximately 16.09 kilometres.

Rounding may cause a small difference when converting back; retain more decimal places when precision matters.

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Converters

Kilometers to Miles

Convert kilometers to miles.

How to use it

1. Select the source and destination units that describe the same physical quantity in Kilometers to Miles; check prefixes such as milli-, kilo- and mega- before converting.
2. Enter the value without changing its unit label, then check the result's unit as well as its number. Temperature conversions use offsets, unlike simple scale-factor conversions.
3. Convert the result back to the original unit as a quick check and compare rounding with the precision required by your task.

Example and verification

Example: 10 kilometres is approximately 6.21 miles.

Check whether the input is kilometres, not metres, before converting.

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Converters

Feet to Meters

Convert feet to meters.

How to use it

1. Select the source and destination units that describe the same physical quantity in Feet to Meters; check prefixes such as milli-, kilo- and mega- before converting.
2. Enter the value without changing its unit label, then check the result's unit as well as its number. Temperature conversions use offsets, unlike simple scale-factor conversions.
3. Convert the result back to the original unit as a quick check and compare rounding with the precision required by your task.

Example and verification

Example: 6 feet is approximately 1.829 metres.

Feet and square feet measure different quantities; select the length converter for a length value.

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Converters

Meters to Feet

Convert meters to feet.

How to use it

1. Select the source and destination units that describe the same physical quantity in Meters to Feet; check prefixes such as milli-, kilo- and mega- before converting.
2. Enter the value without changing its unit label, then check the result's unit as well as its number. Temperature conversions use offsets, unlike simple scale-factor conversions.
3. Convert the result back to the original unit as a quick check and compare rounding with the precision required by your task.

Example and verification

Example: 2 metres is approximately 6.56 feet.

Check whether the target asks for decimal feet or feet-and-inches notation.

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Converters

Inches to Centimeters

Convert inches to centimeters.

How to use it

1. Select the source and destination units that describe the same physical quantity in Inches to Centimeters; check prefixes such as milli-, kilo- and mega- before converting.
2. Enter the value without changing its unit label, then check the result's unit as well as its number. Temperature conversions use offsets, unlike simple scale-factor conversions.
3. Convert the result back to the original unit as a quick check and compare rounding with the precision required by your task.

Example and verification

Example: 12 inches equals 30.48 centimetres.

Keep the units visible when copying the result into a plan or specification.

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Converters

Centimeters to Inches

Convert centimeters to inches.

How to use it

1. Select the source and destination units that describe the same physical quantity in Centimeters to Inches; check prefixes such as milli-, kilo- and mega- before converting.
2. Enter the value without changing its unit label, then check the result's unit as well as its number. Temperature conversions use offsets, unlike simple scale-factor conversions.
3. Convert the result back to the original unit as a quick check and compare rounding with the precision required by your task.

Example and verification

Example: 30 centimetres is approximately 11.81 inches.

Do not round too early if the measurement will be used for a close fit.

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Text tools

Character Frequency

Count character occurrences.

How to use it

1. Paste a small, non-sensitive sample into Character Frequency first and check what the tool treats as a word, line, character or encoded value.
2. Compare the output with a manual check on the sample, especially for spaces, line breaks, punctuation, Unicode characters and empty lines.
3. Only process text you are allowed to use; avoid pasting passwords, private keys, personal records or confidential documents. Copy or download the result and check it before using it elsewhere.

Example and verification

Example: In “banana”, the letter “a” appears 3 times, “n” appears 2 times and “b” appears once.

Check whether spaces, punctuation and letter case are counted as separate characters.

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Text tools

Line Counter

Count total and non-empty lines.

How to use it

1. Paste a small, non-sensitive sample into Line Counter first and check what the tool treats as a word, line, character or encoded value.
2. Compare the output with a manual check on the sample, especially for spaces, line breaks, punctuation, Unicode characters and empty lines.
3. Only process text you are allowed to use; avoid pasting passwords, private keys, personal records or confidential documents. Copy or download the result and check it before using it elsewhere.

Example and verification

Example: The text “red green blue” contains 3 non-empty lines. Blank-line handling may change the count.

Confirm whether blank lines and a final newline are included in the displayed total.

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Text tools

Email Extractor

Extract email addresses from text.

How to use it

1. Paste a small, non-sensitive sample into Email Extractor first and check what the tool treats as a word, line, character or encoded value.
2. Compare the output with a manual check on the sample, especially for spaces, line breaks, punctuation, Unicode characters and empty lines.
3. Only process text you are allowed to use; avoid pasting passwords, private keys, personal records or confidential documents. Copy or download the result and check it before using it elsewhere.

Example and verification

Example: Paste a test sentence containing contact@example.com and check that the address is detected.

Review extracted addresses before sending messages and avoid collecting or sharing personal information without permission.

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Text tools

Number Extractor

Extract numbers from text.

How to use it

1. Paste a small, non-sensitive sample into Number Extractor first and check what the tool treats as a word, line, character or encoded value.
2. Compare the output with a manual check on the sample, especially for spaces, line breaks, punctuation, Unicode characters and empty lines.
3. Only process text you are allowed to use; avoid pasting passwords, private keys, personal records or confidential documents. Copy or download the result and check it before using it elsewhere.

Example and verification

Example: From “Order 42, box 7”, a number extractor should identify 42 and 7.

Check whether the tool includes decimals, signs or digits inside dates and IDs; extraction is not semantic validation.

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Text tools

Text Trimmer

Trim lines and remove blank lines.

How to use it

1. Paste a small, non-sensitive sample into Text Trimmer first and check what the tool treats as a word, line, character or encoded value.
2. Compare the output with a manual check on the sample, especially for spaces, line breaks, punctuation, Unicode characters and empty lines.
3. Only process text you are allowed to use; avoid pasting passwords, private keys, personal records or confidential documents. Copy or download the result and check it before using it elsewhere.

Example and verification

Example: Input “ hello world ” and confirm the leading and trailing whitespace is removed.

Trimming outer whitespace differs from removing spaces between words.

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Text tools

Text Line Joiner

Join lines with a separator.

How to use it

1. Paste a small, non-sensitive sample into Text Line Joiner first and check what the tool treats as a word, line, character or encoded value.
2. Compare the output with a manual check on the sample, especially for spaces, line breaks, punctuation, Unicode characters and empty lines.
3. Only process text you are allowed to use; avoid pasting passwords, private keys, personal records or confidential documents. Copy or download the result and check it before using it elsewhere.

Example and verification

Example: Join the lines “red” and “green” and inspect the separator used in the output.

Check whether the tool uses spaces, commas or another separator so the joined text fits its destination.

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Text tools

Text Wrap

Wrap text to a chosen width.

How to use it

1. Paste a small, non-sensitive sample into Text Wrap first and check what the tool treats as a word, line, character or encoded value.
2. Compare the output with a manual check on the sample, especially for spaces, line breaks, punctuation, Unicode characters and empty lines.
3. Only process text you are allowed to use; avoid pasting passwords, private keys, personal records or confidential documents. Copy or download the result and check it before using it elsewhere.

Example and verification

Example: Wrap “SmartTools” at a width of 5 characters and check that the line breaks follow the selected width.

Word wrapping may preserve whole words instead of splitting long words; verify the intended behavior.

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Text tools

ASCII Converter

Convert text and ASCII codes.

How to use it

1. Paste a small, non-sensitive sample into ASCII Converter first and check what the tool treats as a word, line, character or encoded value.
2. Compare the output with a manual check on the sample, especially for spaces, line breaks, punctuation, Unicode characters and empty lines.
3. Only process text you are allowed to use; avoid pasting passwords, private keys, personal records or confidential documents. Copy or download the result and check it before using it elsewhere.

Example and verification

Example: The ASCII code for uppercase A is 65; converting 65 back should produce A in an ASCII-compatible mode.

ASCII covers a limited character set. Characters outside it require Unicode encoding.

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Date & time

Days in Month

Find days in a month.

How to use it

1. Enter the complete date/time values requested by Days in Month and confirm the displayed date format, timezone and whether the end date is included.
2. Check edge cases such as month ends, leap years, daylight-saving changes or weekends where relevant; these can change calendar-based results.
3. Test the result with a known date pair and compare the displayed units (days, weeks, months or years) with the question you need to answer.

Example and verification

Example: February 2024 has 29 days because 2024 is a leap year. February 2025 has 28 days.

Leap-year rules matter for February; check the year as well as the month.

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Date & time

Add Months to Date

Add or subtract months from a date.

How to use it

1. Enter the complete date/time values requested by Add Months to Date and confirm the displayed date format, timezone and whether the end date is included.
2. Check edge cases such as month ends, leap years, daylight-saving changes or weekends where relevant; these can change calendar-based results.
3. Test the result with a known date pair and compare the displayed units (days, weeks, months or years) with the question you need to answer.

Example and verification

Example: Adding 2 months to 15 January 2026 gives 15 March 2026. End-of-month dates can follow different rules.

For dates such as the 31st, month-end behavior varies by software and business rule; inspect the resulting date.

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Date & time

Business Days

Count weekdays between two dates.

How to use it

1. Enter the complete date/time values requested by Business Days and confirm the displayed date format, timezone and whether the end date is included.
2. Check edge cases such as month ends, leap years, daylight-saving changes or weekends where relevant; these can change calendar-based results.
3. Test the result with a known date pair and compare the displayed units (days, weeks, months or years) with the question you need to answer.

Example and verification

Example: A Monday-to-Friday date range can be counted as working days, but public holidays may not be excluded unless the tool supports a holiday calendar.

Confirm the weekend pattern and holiday calendar for the relevant country or organisation.

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Date & time

Days Until Date

Count days to a target date.

How to use it

1. Enter the complete date/time values requested by Days Until Date and confirm the displayed date format, timezone and whether the end date is included.
2. Check edge cases such as month ends, leap years, daylight-saving changes or weekends where relevant; these can change calendar-based results.
3. Test the result with a known date pair and compare the displayed units (days, weeks, months or years) with the question you need to answer.

Example and verification

Example: Choose a target date in the future and compare the displayed remaining days with a calendar calculation.

The answer changes daily and can depend on time zone and whether today is counted.

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Date & time

Age at Date

Calculate age on a selected date.

How to use it

1. Enter the complete date/time values requested by Age at Date and confirm the displayed date format, timezone and whether the end date is included.
2. Check edge cases such as month ends, leap years, daylight-saving changes or weekends where relevant; these can change calendar-based results.
3. Test the result with a known date pair and compare the displayed units (days, weeks, months or years) with the question you need to answer.

Example and verification

Example: Enter a birth date and a later “age on” date; the result should be based on that reference date, not today.

Check date format and reference date; this calculation does not establish legal eligibility.

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Health & fitness estimates

Macro Split

Calculate calories from macros.

How to use it

1. Enter the measurements and units requested by Macro Split; check that height, mass, age, activity level and other inputs use the intended units and categories.
2. Treat the output as a general estimate, not a diagnosis or a personal medical prescription. Individual needs can differ from formula assumptions.
3. Repeat the calculation with the inputs checked for typing errors and discuss health decisions with a qualified clinician or dietitian when appropriate.

Example and verification

Example: Enter a sample calorie target and chosen macro percentages that add to 100%; verify the displayed shares match those percentages.

Macro estimates are informational only. Nutritional needs vary, and this tool should not be treated as a personalised medical plan.

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Health & fitness estimates

Water Intake Estimate

Estimate daily water intake.

How to use it

1. Enter the measurements and units requested by Water Intake Estimate; check that height, mass, age, activity level and other inputs use the intended units and categories.
2. Treat the output as a general estimate, not a diagnosis or a personal medical prescription. Individual needs can differ from formula assumptions.
3. Repeat the calculation with the inputs checked for typing errors and discuss health decisions with a qualified clinician or dietitian when appropriate.

Example and verification

Example: Use the tool’s sample inputs and check that the result’s units are clearly shown, such as millilitres or litres.

Hydration needs vary with climate, activity, age and health. Do not force a fixed target; follow clinician guidance where applicable.

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Health & fitness estimates

Reference Weight Range

Estimate a reference weight range from height.

How to use it

1. Select the source and destination units that describe the same physical quantity in Reference Weight Range; check prefixes such as milli-, kilo- and mega- before converting.
2. Enter the value without changing its unit label, then check the result's unit as well as its number. Temperature conversions use offsets, unlike simple scale-factor conversions.
3. Convert the result back to the original unit as a quick check and compare rounding with the precision required by your task.

Example and verification

Example: Review the tool’s stated formula and units, and treat any displayed range as a broad population estimate rather than a personal goal.

A formula-based range cannot assess individual health or growth. Avoid using it alone to make health decisions.

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Developer & data tools

JWT Payload Decoder

Decode a JWT payload locally.

How to use it

1. Use a small test value in JWT Payload Decoder and check the expected input format before processing real data.
2. Inspect the result for escaping, parsing, precision or formatting changes; valid output for one format may not be valid for another.
3. Test a normal case and a malformed or boundary case, and validate the result with the destination application or a trusted parser before relying on it.

Example and verification

Example: Use a deliberately fake sample token for practice and inspect the decoded payload fields.

Decoding a JWT does not validate its signature or claims. Never paste a live access token or private credential into a tool.

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Developer & data tools

URL Parser

Break a URL into components.

How to use it

1. Use a small test value in URL Parser and check the expected input format before processing real data.
2. Inspect the result for escaping, parsing, precision or formatting changes; valid output for one format may not be valid for another.
3. Test a normal case and a malformed or boundary case, and validate the result with the destination application or a trusted parser before relying on it.

Example and verification

Example: Parse https://example.com/path?item=book and check the scheme (https), host (example.com), path and query separately.

A parsed URL is not proof that a site is trustworthy or that the destination is safe.

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Developer & data tools

Query String Builder

Build a URL query string.

How to use it

1. Use a small test value in Query String Builder and check the expected input format before processing real data.
2. Inspect the result for escaping, parsing, precision or formatting changes; valid output for one format may not be valid for another.
3. Test a normal case and a malformed or boundary case, and validate the result with the destination application or a trusted parser before relying on it.

Example and verification

Example: Build a query string with q=online tools and page=2; spaces and reserved characters should be encoded correctly.

Do not put passwords, private keys or other secrets into URL query parameters.

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Developer & data tools

HTML Preview

Preview HTML in a sandboxed frame.

How to use it

1. Use a small test value in HTML Preview and check the expected input format before processing real data.
2. Inspect the result for escaping, parsing, precision or formatting changes; valid output for one format may not be valid for another.
3. Test a normal case and a malformed or boundary case, and validate the result with the destination application or a trusted parser before relying on it.

Example and verification

Example: Try a simple snippet such as <p>Hello</p> and confirm the preview matches the intended markup.

Preview only code you understand. HTML previews may behave differently from a production site and should not be used to test untrusted scripts.

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Developer & data tools

CSS Minifier

Minify basic CSS whitespace.

How to use it

1. Use a small test value in CSS Minifier and check the expected input format before processing real data.
2. Inspect the result for escaping, parsing, precision or formatting changes; valid output for one format may not be valid for another.
3. Test a normal case and a malformed or boundary case, and validate the result with the destination application or a trusted parser before relying on it.

Example and verification

Example: Minify a small CSS rule such as body { margin: 0; } and confirm the rule still applies the same way.

Keep a readable source copy and test the minified stylesheet in the target page.

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Developer & data tools

JS Cleaner

Clean comments and excess whitespace.

How to use it

1. Use a small test value in JS Cleaner and check the expected input format before processing real data.
2. Inspect the result for escaping, parsing, precision or formatting changes; valid output for one format may not be valid for another.
3. Test a normal case and a malformed or boundary case, and validate the result with the destination application or a trusted parser before relying on it.

Example and verification

Example: Run a small test such as const total = 2 + 3; and confirm the cleaned output preserves the behavior.

Test the output before deploying; minification or cleanup cannot guarantee code is bug-free.

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Developer & data tools

ISO Date Formatter

Convert a date/time to ISO 8601.

How to use it

1. Enter the complete date/time values requested by ISO Date Formatter and confirm the displayed date format, timezone and whether the end date is included.
2. Check edge cases such as month ends, leap years, daylight-saving changes or weekends where relevant; these can change calendar-based results.
3. Test the result with a known date pair and compare the displayed units (days, weeks, months or years) with the question you need to answer.

Example and verification

Example: Format 23 October 2026 as the ISO date 2026-10-23 when a date-only value is required.

Date-time values may also require a time and time-zone offset; do not drop those details when they matter.

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Developer & data tools

CSV to JSON

Convert simple CSV to JSON.

How to use it

1. Paste a small, non-sensitive sample into CSV to JSON first and check what the tool treats as a word, line, character or encoded value.
2. Compare the output with a manual check on the sample, especially for spaces, line breaks, punctuation, Unicode characters and empty lines.
3. Only process text you are allowed to use; avoid pasting passwords, private keys, personal records or confidential documents. Copy or download the result and check it before using it elsewhere.

Example and verification

Example: Convert a CSV with headers “name,age” and a row “Asha,20”; verify the JSON contains the matching keys and values.

CSV values may be interpreted as strings, and commas, quotes or line breaks inside fields need correct escaping.

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Developer & data tools

JSON to CSV

Convert JSON arrays to CSV.

How to use it

1. Paste a small, non-sensitive sample into JSON to CSV first and check what the tool treats as a word, line, character or encoded value.
2. Compare the output with a manual check on the sample, especially for spaces, line breaks, punctuation, Unicode characters and empty lines.
3. Only process text you are allowed to use; avoid pasting passwords, private keys, personal records or confidential documents. Copy or download the result and check it before using it elsewhere.

Example and verification

Example: Convert [{"name":"Asha","age":20}] and check that the CSV has columns for name and age.

Nested JSON objects and arrays do not fit neatly into flat CSV columns; inspect how the tool handles them.

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Developer & data tools

Password Strength

Estimate password strength locally.

How to use it

1. Paste a small, non-sensitive sample into Password Strength first and check what the tool treats as a word, line, character or encoded value.
2. Compare the output with a manual check on the sample, especially for spaces, line breaks, punctuation, Unicode characters and empty lines.
3. Only process text you are allowed to use; avoid pasting passwords, private keys, personal records or confidential documents. Copy or download the result and check it before using it elsewhere.

Example and verification

Example: Test a made-up example rather than a real password and review the tool’s feedback on length and character variety.

A strength meter is only a heuristic. Do not share a real password with anyone or rely on a score alone.

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File & image tools

Folder to ZIP Converter

Package a folder or selected files into a downloadable ZIP locally.

How to use it

1. Choose the options that match your intended output in Folder to ZIP Converter, then use a small test input before processing a larger file or generating a final result.
2. Check the output format, file extension, dimensions or selection rules. If randomness is involved, a new output may differ each time.
3. Open or validate the generated output before sharing it. Do not treat a QR code as trustworthy until its destination has been checked, and do not upload confidential files unless you understand how they are processed.

Example and verification

Example: Select a small folder of non-sensitive test files, create the ZIP and open the downloaded archive to verify that expected files are present.

Check file size limits and retain the originals until the archive has been opened and verified.

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File & image tools

Files to ZIP

Select multiple files and download them as one ZIP archive.

How to use it

1. Choose the options that match your intended output in Files to ZIP, then use a small test input before processing a larger file or generating a final result.
2. Check the output format, file extension, dimensions or selection rules. If randomness is involved, a new output may differ each time.
3. Open or validate the generated output before sharing it. Do not treat a QR code as trustworthy until its destination has been checked, and do not upload confidential files unless you understand how they are processed.

Example and verification

Example: Select two small test files, create an archive and confirm both files appear inside the downloaded ZIP.

Keep the original files until the archive is verified; do not assume a download succeeded just because processing finished.

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File & image tools

Image Size Reducer

Compress JPG, PNG or WebP images and compare file sizes.

How to use it

1. Enter the complete date/time values requested by Image Size Reducer and confirm the displayed date format, timezone and whether the end date is included.
2. Check edge cases such as month ends, leap years, daylight-saving changes or weekends where relevant; these can change calendar-based results.
3. Test the result with a known date pair and compare the displayed units (days, weeks, months or years) with the question you need to answer.

Example and verification

Example: Compare the original and compressed file sizes, then open the output and inspect readability and dimensions.

Compression can reduce quality or remove metadata. Keep an original copy when image quality matters.

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File & image tools

Image Format Converter

Convert supported images between JPG, PNG and WebP.

How to use it

1. Enter the complete date/time values requested by Image Format Converter and confirm the displayed date format, timezone and whether the end date is included.
2. Check edge cases such as month ends, leap years, daylight-saving changes or weekends where relevant; these can change calendar-based results.
3. Test the result with a known date pair and compare the displayed units (days, weeks, months or years) with the question you need to answer.

Example and verification

Example: Convert a test image from one supported format to another and open the result to check transparency, colors and dimensions.

Some formats do not preserve transparency or animation. Check the output before replacing the source file.

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File & image tools

Image Resizer

Resize images by dimensions or percentage and download the result.

How to use it

1. Enter the complete date/time values requested by Image Resizer and confirm the displayed date format, timezone and whether the end date is included.
2. Check edge cases such as month ends, leap years, daylight-saving changes or weekends where relevant; these can change calendar-based results.
3. Test the result with a known date pair and compare the displayed units (days, weeks, months or years) with the question you need to answer.

Example and verification

Example: Resize a test image from 1200 × 800 pixels to 600 × 400 pixels and confirm the aspect ratio remains 3:2.

Changing dimensions can affect sharpness and file size. Keep an original copy and check the final use case.

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File & image tools

Images to PDF

Combine supported images into a printable PDF file.

How to use it

1. Enter the complete date/time values requested by Images to PDF and confirm the displayed date format, timezone and whether the end date is included.
2. Check edge cases such as month ends, leap years, daylight-saving changes or weekends where relevant; these can change calendar-based results.
3. Test the result with a known date pair and compare the displayed units (days, weeks, months or years) with the question you need to answer.

Example and verification

Example: Choose two test images, create a PDF and open it to confirm page order, orientation and margins.

Check image resolution and page size before printing or sharing the PDF.

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File & image tools

PDF to Image Guide

Learn supported options for converting PDF pages to images.

How to use it

1. Enter the complete date/time values requested by PDF to Image Guide and confirm the displayed date format, timezone and whether the end date is included.
2. Check edge cases such as month ends, leap years, daylight-saving changes or weekends where relevant; these can change calendar-based results.
3. Test the result with a known date pair and compare the displayed units (days, weeks, months or years) with the question you need to answer.

Example and verification

Example: Convert a sample PDF page to an image and check text legibility and page dimensions.

Large or complex PDFs can create large images; check file size and readability before sharing.

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File & image tools

Merge PDF Files

Combine PDF documents in your browser when the PDF library is available.

How to use it

1. Choose the options that match your intended output in Merge PDF Files, then use a small test input before processing a larger file or generating a final result.
2. Check the output format, file extension, dimensions or selection rules. If randomness is involved, a new output may differ each time.
3. Open or validate the generated output before sharing it. Do not treat a QR code as trustworthy until its destination has been checked, and do not upload confidential files unless you understand how they are processed.

Example and verification

Example: Merge two small test PDFs and verify that both documents appear in the expected order.

Keep original files and check page order, rotation and any sensitive content before sharing the merged PDF.

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File & image tools

Split PDF Pages

Extract selected PDF pages into a separate document when supported.

How to use it

1. Enter the complete date/time values requested by Split PDF Pages and confirm the displayed date format, timezone and whether the end date is included.
2. Check edge cases such as month ends, leap years, daylight-saving changes or weekends where relevant; these can change calendar-based results.
3. Test the result with a known date pair and compare the displayed units (days, weeks, months or years) with the question you need to answer.

Example and verification

Example: Split a sample three-page PDF to export page 2, then open the output and verify the selected page.

Page numbering may be one-based or zero-based in some tools; check the preview and output.

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Text tools

Text Difference Checker

Compare two text blocks and identify lines that differ.

How to use it

1. Paste a small, non-sensitive sample into Text Difference Checker first and check what the tool treats as a word, line, character or encoded value.
2. Compare the output with a manual check on the sample, especially for spaces, line breaks, punctuation, Unicode characters and empty lines.
3. Only process text you are allowed to use; avoid pasting passwords, private keys, personal records or confidential documents. Copy or download the result and check it before using it elsewhere.

Example and verification

Example: Compare “colour” with “color” and check that the changed word is highlighted.

Differences can include whitespace and line endings; inspect context before accepting a change.

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Text tools

Reading Time Calculator

Estimate reading time and speaking time for a text.

How to use it

1. Paste a small, non-sensitive sample into Reading Time Calculator first and check what the tool treats as a word, line, character or encoded value.
2. Compare the output with a manual check on the sample, especially for spaces, line breaks, punctuation, Unicode characters and empty lines.
3. Only process text you are allowed to use; avoid pasting passwords, private keys, personal records or confidential documents. Copy or download the result and check it before using it elsewhere.

Example and verification

Example: A 600-word passage at an assumed 200 words per minute gives an estimated reading time of about 3 minutes.

Actual reading speed varies by reader, language and complexity; treat this as a rough estimate.

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Text tools

Character Counter

Count characters with and without spaces.

How to use it

1. Paste a small, non-sensitive sample into Character Counter first and check what the tool treats as a word, line, character or encoded value.
2. Compare the output with a manual check on the sample, especially for spaces, line breaks, punctuation, Unicode characters and empty lines.
3. Only process text you are allowed to use; avoid pasting passwords, private keys, personal records or confidential documents. Copy or download the result and check it before using it elsewhere.

Example and verification

Example: The word “Hello” contains 5 characters. Check whether spaces and line breaks are included for longer text.

Social platforms and forms may count Unicode characters or bytes differently; use the destination’s own counter when limits are strict.

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Developer & data tools

CSV to JSON Converter

Convert simple CSV data into JSON with quoted-field support.

How to use it

1. Paste a small, non-sensitive sample into CSV to JSON Converter first and check what the tool treats as a word, line, character or encoded value.
2. Compare the output with a manual check on the sample, especially for spaces, line breaks, punctuation, Unicode characters and empty lines.
3. Only process text you are allowed to use; avoid pasting passwords, private keys, personal records or confidential documents. Copy or download the result and check it before using it elsewhere.

Example and verification

Example: Use a CSV with two headers and one row, then check that each header becomes a JSON property.

CSV parsing depends on correct quoting and delimiters; verify rows containing commas or line breaks.

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Developer & data tools

JSON to CSV Converter

Convert an array of JSON objects to CSV.

How to use it

1. Paste a small, non-sensitive sample into JSON to CSV Converter first and check what the tool treats as a word, line, character or encoded value.
2. Compare the output with a manual check on the sample, especially for spaces, line breaks, punctuation, Unicode characters and empty lines.
3. Only process text you are allowed to use; avoid pasting passwords, private keys, personal records or confidential documents. Copy or download the result and check it before using it elsewhere.

Example and verification

Example: Convert a simple array of objects with the same keys and check the CSV header and row alignment.

Objects with different keys or nested values may require manual cleanup after conversion.

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Developer & data tools

URL Parser

Inspect protocol, hostname, path, query parameters and hash.

How to use it

1. Use a small test value in URL Parser and check the expected input format before processing real data.
2. Inspect the result for escaping, parsing, precision or formatting changes; valid output for one format may not be valid for another.
3. Test a normal case and a malformed or boundary case, and validate the result with the destination application or a trusted parser before relying on it.

Example and verification

Example: Enter https://example.com/a?b=2#section and inspect protocol, hostname, path, query and fragment.

Parsing a URL does not verify that the destination exists or is safe.

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SEO & web tools

SEO Meta Preview

Preview a search result title and description and check character counts.

How to use it

1. Start with a small example that matches the purpose of SEO Meta Preview, then enter each required input exactly as labelled.
2. Check units, format options, assumptions and rounding before interpreting the result; the same number can mean different things when its unit or context changes.
3. Compare the result with the worked example and test one input change at a time. If the live tool disagrees with the guide, report the input values and result so the issue can be reproduced.

Example and verification

Example: Enter a descriptive title and summary for a sample page, then check spelling, truncation and how the preview reads on a small screen.

Search engines may rewrite titles and snippets; a preview cannot guarantee how a result will appear.

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SEO & web tools

QR Code Generator

Create a QR code for text or a URL using a browser-side generator.

How to use it

1. Choose the options that match your intended output in QR Code Generator, then use a small test input before processing a larger file or generating a final result.
2. Check the output format, file extension, dimensions or selection rules. If randomness is involved, a new output may differ each time.
3. Open or validate the generated output before sharing it. Do not treat a QR code as trustworthy until its destination has been checked, and do not upload confidential files unless you understand how they are processed.

Example and verification

Example: Create a QR code for https://example.com, download it, scan it with a device and confirm the decoded destination before printing.

Test the QR after download and after printing. Do not encode private information, and check the destination before sharing.

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