Small, fast, free tools.

Convert between Unix timestamps and human-readable dates across timezones.

Years, months, days, weeks, and total time between two dates. Optional business-days mode.

Exact age in years, months, days, hours, and seconds — plus the days until your next birthday.

Live countdown (or count-up) to any target date and time, in any timezone.

Decode any cron schedule into plain English and see the next few fire times.

Compare working hours across up to six time zones to find the best meeting window.

Convert freely between "1h 30m", "01:30:00", and seconds.

Convert any time between 12-hour (AM/PM) and 24-hour notation.

Estimate monthly repayments, total interest, and amortisation for a home loan.

Project compound growth with regular contributions over time.

Convert between RGB, HEX, HSL, and CMYK colour spaces.

Check colour contrast against WCAG AA and AAA accessibility thresholds.

Convert pounds, kilograms, ounces, grams, and stones.

Convert litres, gallons (US/UK), millilitres, and fluid ounces.

Convert kilometres, miles, metres, feet, and more.

Convert between Celsius, Fahrenheit, Kelvin, and Rankine.

Convert km/h, mph, m/s, knots, and more.

Convert square metres, square feet, acres, hectares, and more.

Convert joules, kilowatt-hours, calories, BTU, and more.

Convert watts, kilowatts, horsepower, BTU/h, and more.

Convert PSI, bar, kPa, atm, mmHg, and more.

Convert bytes, kilobytes, megabytes, gigabytes (decimal vs. binary), and bits.

Pretty-print, validate, or minify JSON with helpful error positions.

Encode text to Base64 or decode Base64 back to text. UTF-8 safe.

Percent-encode or decode URLs and query parameters.

Decode a JSON Web Token to inspect its header and payload.

Turn any text into a clean URL-safe kebab-case slug.

Convert between camelCase, PascalCase, snake_case, kebab-case, and more.

Live counts of characters, words, sentences, paragraphs, lines, and reading time.

Generate one or many cryptographically-random UUIDs (v4) in seconds.

Strong, random passwords with configurable length, charset, and entropy estimate.

Generate placeholder text by paragraphs, sentences, or words.

Three quick percentage calculators: % of a number, what % is X of Y, and percent change.

Convert between fractions and decimals, simplify, and find best rational approximations.

Solve a right triangle from any two sides, or one side and one acute angle.

Solve ax² + bx + c = 0 — real or complex roots, vertex, axis of symmetry.

Find the greatest common divisor, least common multiple, prime factorisation, and divisors.

Body Mass Index from weight and height, with category and healthy weight range.

Daily energy expenditure (Mifflin-St Jeor) with cut, maintain, and bulk targets plus macros.

Convert between distance, time, and pace with race presets and per-km/mile splits.

Look up the abbreviation, capital, and joined-confederation year for any Canadian province or territory.