Free developer utilities
JSON, Base64, regex, hashes, UUIDs, and more — everyday developer tools that run entirely in your browser, with nothing you paste ever leaving your device.
Developer Tools
JSON Formatter & Validator
Format & ValidatePretty-print, minify, and validate JSON, with clear error locations.
Regex Tester
Format & ValidateTest a regular expression against sample text and see every match highlighted.
Text Diff Checker
Format & ValidateCompare two blocks of text and see exactly what changed, line by line.
Base64 Encode / Decode
Encode & DecodeEncode text to Base64 or decode a Base64 string back to text.
URL Encode / Decode
Encode & DecodePercent-encode or decode text and URLs for safe use in links and query strings.
JWT Decoder
Encode & DecodeDecode a JSON Web Token's header and payload — no signature verification, no network call.
UUID Generator
Generate & ConvertGenerate one or many random UUIDs (v4), formatted however you need.
Hash Generator
Generate & ConvertGenerate MD5, SHA-1, SHA-256, SHA-384, and SHA-512 hashes of any text.
Unix Timestamp Converter
Generate & ConvertConvert between Unix timestamps and human-readable dates, in any time zone.