Free online developer tools that run entirely in your browser. No signup, no data collection, no limits.
Format, validate, and beautify JSON data
Encode and decode URLs and URL components
Encode and decode Base64 strings
Convert between Unix timestamps and human-readable dates
Count words, characters, sentences, and paragraphs
Convert text: camelCase, snake_case, UPPERCASE, and more
Convert between HEX, RGB, HSL, and CMYK
Generate secure, random passwords with custom options
Calculate days between dates
Create QR codes for URLs, text, and more
Convert between Binary, Decimal, Hex, Octal
Generate SHA-1, SHA-256, SHA-512 hashes
Encode and decode HTML entities
Remove extra spaces, empty lines, and duplicates
Calculate exact age from birthdate
Convert time between different time zones
Convert between Arabic numbers and Roman numerals
Minify JavaScript and CSS code
Generate stylish text with Unicode characters
Compare two texts and highlight differences
FreeDevTools provides 20 free online developer utilities that run entirely in your browser. No data is ever sent to any server. No signup required. Built by developers, for developers.