Free Online Developer, Text, Finance & Calculator Tools
22 free browser-based tools. No sign-up required.
JSON Formatter / Validator
Format, validate, and beautify JSON data instantly
Base64 Encoder / Decoder
Encode and decode Base64 strings, files, and images
JWT Decoder
Decode and inspect JSON Web Tokens instantly
URL Encoder / Decoder
Encode and decode URLs with percent-encoding
Regex Tester
Test regular expressions with real-time matching
Hash Generator
Generate MD5, SHA-1, SHA-256, and other hashes
Text Diff Checker
Compare two texts and find differences
Color Picker / Converter
Pick colors and convert between HEX, RGB, HSL formats
Percentage Calculator
Calculate percentages, discounts, and percentage changes instantly
Date Calculator
Calculate days between dates or add/subtract days from a date
Unit Converter
Convert length, weight, temperature, volume, and more
Tip Calculator
Calculate tips and split bills among friends easily
Age Calculator
Calculate your exact age in years, months, days, and more
BMI Calculator
Calculate your Body Mass Index and check your weight status
Data Storage Converter
Convert between bytes, KB, MB, GB, TB and other data units