Fast conversion & coding tools, right in your browser.

Millimeters to miles and everything between: mm, cm, m, km, inch, foot, yard, mile.

Celsius, Fahrenheit and Kelvin in both directions.

Grams, kilograms, tonnes, pounds and ounces.

Square meters, square feet, acres, hectares and square miles.

km/h, mph, m/s, knots and feet per second.

Bytes, KB, MB, GB, TB and PB, binary units.

Liters, milliliters, cubic meters, gallons and cubic feet.

Pascal, bar, psi, atmosphere and mmHg.

Joules, calories, kilowatt-hours and BTU.

Watts, kilowatts, horsepower and BTU/hour.

Degrees, radians, gradians, arcminutes and turns.

Milliseconds, seconds, hours, days, weeks and years.

Hertz, kilohertz, megahertz and gigahertz.

Newton-meters, pound-feet and more.

Newtons, kilogram-force and pound-force.

kg/m3, g/cm3 and lb/ft3.

L/min, m3/h and gallons per minute.

Amps, milliamps and microamps.

Volts, millivolts and kilovolts.

Ohms, kiloohms and megaohms.

Farads, microfarads and picofarads.

Henries, millihenries and microhenries.

bps, kbps, Mbps and Gbps.

Siemens, millisiemens and microsiemens.

Pixels, points, em and inches.

Lux and foot-candles.

Coulombs, milliamp-hours and amp-hours.

L/100 km to mpg and back.

Encode or decode text to Base64, and back again.

Percent-encode or decode a URL or query string.

Beautify, validate and compact JSON in one click.

Convert text to hex bytes and back.

Convert colors between RGB and hex with a live preview.

Generate a SHA-256 hash of any text, entirely in your browser.

Generate an MD5 hash of any text, entirely in your browser.

Generate one or many random UUID v4 identifiers.

Binary, octal, decimal and hexadecimal in one click.

Encode or decode text to HTML entities and back.

Convert CSV text to JSON arrays, and back again.

Turn an image file into a Base64 data URI with preview.

Turn text into a clean URL slug.

Test patterns with live matches.

Convert text to binary and back.

Write Markdown, preview HTML live.

Pick a color, copy HEX, RGB and HSL.

Build an HTML table and copy the code.

Write any number as English words.

Numbers to Roman numerals and back.

Browse printable ASCII codes 32–126.

Check a contrast ratio and readability.

Days, weeks, months and years between two dates.

Convert a time between UTC offsets in seconds.

Exact age in years, months and days from a birth date.

Convert a Unix timestamp to a readable date, and back.

ISO week number for any date.

Add or subtract days, weeks, months and years.

Weekdays between two dates.

Day number and days left in the year.

Is it a leap year?

Count characters, words, lines and bytes of any text.

Uppercase, lowercase, title and sentence case in one click.

Words, characters, sentences and estimated reading time.

Generate placeholder text for designs and mockups.

Reverse characters or words.

How often each word appears.

Deduplicate lines, keep order.

Sort lines A–Z or Z–A.

Spot what changed between two texts.

Reads the same forwards and back.

Network address, mask, broadcast and usable host range from IP + CIDR.

Look up common TCP/UDP ports and their services.

Validate and classify an IPv4 address.

Random MAC addresses for testing.

Convert an IPv4 address to binary.

Random public IPv4 addresses.

Strong random passwords with custom length and character sets.

Body Mass Index from height and weight, with category.

Percent of a number, and percent change between two values.

Random integers or decimals in a range, one or many at once.

A 25-minute focus timer.

Live time in major cities.

Precise start and stop timer.

Dimensions of common paper formats.

Roll any number of dice.

Heads or tails.

The golden complement of a value.

Count down and get alerted.

Randomize the order of your list.

Final price and savings after a discount.

Future value of an investment with compound interest.

Split a bill with tip across people.

Monthly payment and total interest.

Annual salary to hourly and monthly pay.

Compare price per unit.

GPA from grades and credits.

Time to reach a savings target.

Add or extract tax from a price.

Healthy weight range for your height.

Daily water needs estimate.

Running pace from distance and time.