Free Developer Tools Online
Format JSON, test regex, generate UUIDs, convert CSV, hash text and more — 26 developer tools that run in your browser.
Every tool on this page runs entirely in your browser — no uploads, no signup, no server processing. Format and validate JSON, test regular expressions with live highlighting, generate UUIDs (v4 and v7), convert CSV to JSON, hash text with MD5/SHA-256, decode JWTs, convert timestamps, and more. Bookmark this page for quick access to the developer utilities you use every day.
- JSON Formatter & ValidatorFormat, minify and validate JSON.
- Base64 Encoder / DecoderEncode and decode text to Base64.
- URL Encoder / DecoderPercent-encode and decode URL strings.
- UUID GeneratorRandom v4 and time-ordered v7 UUIDs.
- Regex TesterLive match highlighting and groups.
- Hash Generator (MD5, SHA-256)MD5, SHA-1, SHA-256, SHA-384, SHA-512.
- JWT DecoderDecode tokens, check claims and expiry.
- Unix Timestamp ConverterUnix time ↔ human-readable date.
- HEX ↔ RGB Color ConverterHEX ↔ RGB ↔ HSL with live swatch.
- CSV ↔ JSON ConverterConvert both ways, auto delimiter.
- Password GeneratorStrong random passwords, copy-ready.
- SQL FormatterFormat and beautify SQL queries.
- Markdown PreviewerWrite Markdown, see rendered HTML live.
- Cron Expression GeneratorBuild cron expressions visually.
- Number Base ConverterBinary, octal, decimal, hex conversion.
- JSON ↔ YAML ConverterConvert JSON to YAML and back.
- JSON to TypeScriptGenerate TypeScript interfaces from JSON.
- HTML Entity Encoder / DecoderEncode and decode HTML entities.
- URL Slug GeneratorGenerate SEO-friendly URL slugs.
- JSON DiffCompare two JSON objects side by side.
- Code MinifierMinify JS, CSS and HTML.
- File Checksum CalculatorMD5, SHA-1, SHA-256, SHA-512 checksums.
- JSONPath EvaluatorEvaluate JSONPath expressions against JSON.
- CSS Gradient GeneratorCreate CSS gradients visually.
- Meta Tag GeneratorGenerate SEO meta tags.
- Hex to Text ConverterConvert text to hex and back.