All tools

Turn watts and hours into a cost per day, month and year.

Add, subtract, multiply and divide two fractions with a simplified result.

What a journey costs in fuel, and what each passenger owes.

Find the greatest common divisor and least common multiple of several integers.

Calculate cost, price, profit, margin and markup from any two known values.

Litres to kilograms and grams to millilitres, using density.

Percent of a number, percentage change, add or subtract a percent.

Solve any missing value in the proportion a/b = c/d.

Round a number to decimal places or powers of ten using four methods.

Turn a Polish employment contract salary into take-home pay, with the yearly threshold and contribution cap handled correctly.

Calculate net, VAT and gross amounts using a country preset or your own rate.

Calculate a weighted average from value and weight pairs.

Work out an exact age in years, months and days.

Count down to a date and time with a clear live display.

Find the date a number of days, working days, weeks or months away.

Count the days, weeks, months and working days between two dates.

Check the current UTC offset and the next clock change for a time zone.

Find a practical meeting time across several cities and time zones.

Check the Moon's phase, illumination and rise and set times.

Run a simple countdown timer with pause, resume and sound.

Measure elapsed time and record up to 50 lap times.

Calculate sunrise, sunset, twilight and solar noon for a place and date.

Convert a date and time between any two time zones.

Count working days in a range, with Polish public holidays.

See the current local time in cities and time zones around the world.

Convert text to Base64 and back.

Format C# with a CSharpier-compatible Roslyn engine running in the browser.

Format CSS, SCSS or Less with syntax-aware indentation and line wrapping.

MD5, SHA-1, SHA-256, SHA-512 and CRC-32 of any text, with checksum verification.

Sign a message with a secret key: HMAC-SHA-256, SHA-1, SHA-512 and MD5.

Format and beautify HTML fragments or full documents with HTML-specific controls.

Format and beautify JavaScript with configurable indentation, quotes and semicolons.

Format, indent and beautify JSON.

Check whether JSON is valid and find the exact error.

Inspect the header and payload of a JSON Web Token.

Write Markdown and see a safe, live preview with tables, task lists and code blocks.

Generate strong, cryptographically random passwords on your device.

Format Python with Ruff and configure line length, quotes and trailing commas.

Translate SQL between MySQL, PostgreSQL, T-SQL, Oracle and 12 more dialects.

Convert Unix timestamps to dates and back.

Format TypeScript, interfaces and type annotations with the correct parser.

Generate cryptographically random version 4 UUIDs in bulk.

Format, indent or minify XML without uploading it.

Check whether XML is well-formed and pinpoint syntax errors.

Run an XPath expression against XML and see what it matches.

Format YAML configuration with syntax checking, indentation and line wrapping.

Encode or decode Atbash by reversing the Latin or Polish alphabet.

Encrypt, decrypt, or break a Caesar cipher with Latin, Polish, or custom alphabets.

Convert text between upper, lower, title, camel, snake and kebab case.

Count symbols and rank them by frequency and percentage share.

Compare two texts and see exactly what changed.

Encrypt and decrypt Vigenere text with a repeating key.

Count words, characters, sentences and reading time.

Generate Code 128, EAN, UPC and Code 39 barcodes as PNG or SVG files.

Create a downloadable QR code from a URL or any text.

Convert Roman numerals to decimal numbers and decimal numbers to Roman notation.

Convert between about 250 units of measurement, offline in your browser.

Convert grays, milligrays and rads.

Convert m/s², g-force, ft/s² and km/h per second.

Convert degrees, radians, gradians - and percent slope.

Convert square metres, hectares, acres and square feet.

Convert farads, microfarads, nanofarads and picofarads.

Convert coulombs, ampere-hours and mAh.

Convert amperes, milliamperes and microamperes.

Convert bytes, KB, MB, GB, TB and the KiB/MiB/GiB units.

Convert Mb/s, MB/s, Gb/s and internet speeds.

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

Convert sieverts, millisieverts and rem.

Convert joules, calories, kWh and BTU.

Convert l/min, m³/h, GPM and CFM.

Convert newtons, kilogram-force, pound-force and dynes.

Convert Hz, kHz, MHz, GHz, RPM and rad/s.

Convert l/100 km, MPG (US and UK) and km/l.

Convert lux, foot-candles and phots.

Convert metres, feet, inches, miles and 25 more units of length.

Convert cd/m² (nits), stilbs, lamberts and foot-lamberts.

Convert kilograms, pounds, ounces, stones and tonnes.

Convert kilowatts, horsepower (KM/PS) and BTU/h.

Convert bar, psi, pascals, atmospheres and mmHg.

Convert becquerels, curies and their multiples.

Convert ohms, kilohms, megohms and milliohms.

Convert km/h, mph, m/s, knots - and running pace.

Convert Celsius, Fahrenheit, Kelvin and Rankine.

Convert seconds, minutes, hours, days, weeks and years.

Convert N·m, lbf·ft, kgf·m and lbf·in.

Convert volts, millivolts, kilovolts and megavolts.

Convert litres, millilitres, gallons, pints and cups.