Free Developer Utilities
Free Online Developer Tools
JSON formatter, Base64, regex tester, UUID generator, color converter and more — all in your browser. No account, no tracking, no nonsense.
All Tools
Pick a tool and start using it — no install, no sign-up, nothing stored on our servers.
JSON Formatter
Format, beautify, minify, and validate JSON with syntax highlighting.
Open toolBase64 Encoder
Encode text to Base64 or decode Base64 strings. UTF-8 safe.
Open toolURL Encoder
Encode or decode URL components using percent-encoding (RFC 3986).
Open toolRegex Tester
Test regular expressions live with match highlighting and group capture display.
Open toolColor Converter
Convert colors between HEX, RGB, and HSL with a live preview swatch.
Open toolPX ↔ REM Converter
Convert pixels to rem and back. Set a custom base font size for accurate results.
Open toolTimestamp Converter
Convert Unix timestamps to readable dates and back. Shows live current time.
Open toolWord Counter
Count words, characters, sentences, paragraphs, and reading time in real time.
Open toolUUID Generator
Generate cryptographically secure UUID v4 identifiers. Single or bulk output.
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