Free online tools that just work
Fast, free and private online tools for developers, writers and everyday math. No sign-up, everything runs in your browser.
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Finance Calculators
Loans, mortgages, interest, savings and everyday money math.
Health & Fitness
BMI, calories, body fat, pregnancy and fitness calculators.
Math & Date Calculators
Percentages, fractions, ages, dates and time calculations.
Age CalculatorFind your exact age in years, months and days, plus total weeks and days, the weekday you were born and a countdown to your next birthday.Percentage CalculatorWork out X% of a number, what percent one number is of another, and the percentage increase or decrease. Shows the formula with your own numbers.
View all · 2 toolsDeveloper Tools
Format, convert and debug code and data.
Base64 Encode / DecodeDecode and encode Base64 online with full UTF-8 support, URL-safe mode and clear error messages. Convert files to data URLs. Private: runs in your browser.JSON Formatter & ValidatorFormat, beautify, minify and validate JSON instantly. Shows the exact line of syntax errors. Free and private — runs in your browser.
View all · 2 toolsText Tools
Count, clean up and transform text.
Generators
Passwords, UUIDs, random numbers, placeholder text and more.
Password GeneratorCreate strong, random passwords up to 128 characters with letters, numbers and symbols. See the strength in bits. Generated privately in your browser.UUID GeneratorGenerate random version 4 UUIDs (GUIDs) instantly, from 1 up to 500 at a time, in upper or lower case, with or without hyphens. Copy or download as .txt.
View all · 2 tools