Free Online Developer Tools
Fast, private developer utilities that run entirely in your browser. No server, no tracking, no data collection.
JSON Formatter
Format, minify, sort keys, and validate JSON. Syntax highlighting with line-precise error reporting.
Hash Generator
Compute MD5, SHA-1, SHA-256, SHA-512 hashes. Supports text, files, and HMAC.
UUID Generator
Generate UUID v4 and UUID v7. Bulk generation, multiple formats.
Timestamp Converter
Convert Unix timestamps to human-readable dates and back. Supports seconds and milliseconds.
Color Converter
Convert between HEX, RGB, and HSL color formats. Real-time preview and WCAG contrast checker.
URL Encoder / Decoder
Encode and decode URLs with percent-encoding. Parse any URL into protocol, host, path, and query parameters.
Base64 Encoder / Decoder
Encode text or files to Base64. Decode Base64 strings back to text. Supports URL-safe Base64 and data URIs.