Free Online Developer Tools
Fast, client-side developer utilities that execute 100% in your browser. No data leaves your machine, no tracking, no registration required.
JSON Formatter
Format, beautify, and minify JSON with custom indentation, syntax error detection, and stats.
JSON Validator
Validate JSON syntax with detailed line, column, and character offset error diagnosis.
Base64 Encoder
Encode text, strings, and UTF-8 payloads to Base64 format instantly.
Base64 Decoder
Decode Base64 strings back to clean readable UTF-8 text with error protection.
UUID Generator
Generate random cryptographically secure UUID v4 / GUIDs in batches.
Timestamp Converter
Convert between Unix timestamps (seconds & ms) and human-readable UTC/Local dates.
URL Encoder
Percent-encode URL components, query parameters, and special characters safely.
URL Decoder
Decode percent-encoded URLs and inspect parsed query string parameters.
Regex Tester
Test regular expressions in real-time with match counting and capture group breakdown.
Markdown Editor
Live split-screen Markdown editor with instant preview, formatting toolbar, and export.