Free Online Developer Tools

Format, validate, and minify JSON data instantly

Encode and decode Base64 strings and files

Decode and inspect JSON Web Tokens

Generate MD5, SHA-1, SHA-256, SHA-512 hashes

Test regular expressions with live highlighting

Encode and decode URLs and query strings

Count words, characters, sentences, and reading time

Convert between HEX, RGB, HSL color formats

Generate placeholder text for your designs

Write and preview Markdown in real time

Convert between Unix timestamps and human dates

Convert JSON arrays to CSV and back

Compare two texts and highlight differences

Encode and decode HTML entities

Convert between camelCase, snake_case, kebab-case

Validate JSON with detailed error messages

Generate UUID v4 instantly, single or bulk

Format and beautify SQL queries

Parse cron expressions to human-readable text

Calculate Unix file permissions interactively

Build cron expressions visually with an interactive UI

Interactive CSS Flexbox visualizer and code generator

Convert between decimal, hex, binary, and octal

Complete HTTP status code reference with search