Developer Tools
Free Developer Toolkit
Essential tools for developers — JSON formatter, Base64, Regex tester, Color picker, UUID generator, Hash generator, HTML encoder and more. All run in your browser, private & instant.
12
Tools
100%
Private
0
Server Calls
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JSON Formatter & Validator
Beautify, minify, validate and analyse your JSON data
Base64 Encoder / Decoder
Encode or decode any text or data to/from Base64 format
Regex Tester
Test regular expressions with live match highlighting and group capture
Color Picker & Converter
Pick colors and convert between HEX, RGB, HSL, CMYK and CSS variables
UUID / GUID Generator
Generate v4 UUIDs, NanoIDs and custom unique identifiers
Hash Generator
Generate MD5, SHA-1, SHA-256, SHA-512 hashes from any text
HTML Encoder / Decoder
Encode special characters to HTML entities and decode them back
URL Encoder / Decoder
Encode or decode URLs and query string parameters
JWT Token Decoder
Decode and inspect JWT tokens (Header, Payload, Signature) — no secret needed
Text Diff Checker
Compare two text blocks and highlight additions, deletions and changes
CSS Minifier & Beautifier
Minify CSS to reduce file size or beautify compressed CSS for readability
Markdown Preview
Write Markdown and see a live preview rendered as HTML
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⚠️
Disclaimer. These developer utilities are provided for informational and productivity purposes only. All processing happens locally in your browser. Always validate output before using it in production systems, especially for security-sensitive operations like token decoding or encryption. Read full disclaimer →
More Standalone Developer Tools
Each tool below is also available as its own dedicated page with a full explanation and worked example: