Web tools
Calculators and converters that work instantly, with no install or sign-up, and more on the way. Everything runs in your browser, and nothing you type is sent to a server.
Calculators
CalculatorA simple calculator with parentheses, percent and history
Percentage CalculatorPercent of, percent change, markups and discounts
Date & time
Age CalculatorExact age in years, months and days, and days until your next birthday
Date CalculatorCountdown, days between dates, add or subtract days
Timer & StopwatchCountdown timer with alarm, Pomodoro, lap times
Unix Timestamp ConverterUnix time ↔ human-readable date in your time zone and UTC
Convert & text
Unit ConverterLength, weight, temperature, area, volume, speed, data
Character CounterCharacters, words, sentences and reading time
Random
Random Number GeneratorRandom numbers, pick winners, shuffle a list
Password GeneratorStrong random passwords of any length
Developer
JSON Formatter & ValidatorPretty print, minify, find syntax errors
Base64 Encode & DecodeUTF-8, URL-safe, file to Base64
Hash GeneratorMD5, SHA-1, SHA-256, SHA-512, CRC32, verify checksums
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