DEV9 tools
Free developer tools
Small tools for everyday coding and data work. Format and validate JSON, encode and decode Base64 and URLs, generate UUIDs and MD5 or SHA hashes, convert Unix timestamps, read the claims inside a JWT, test regular expressions and compare two versions of a text. Every developer tool runs in your browser, so the data you paste never leaves your device.
JSON formatterFormat, validate and minify JSONBase64 encode / decodeTurn text or files into Base64 and backURL encode / decodePercent-encode and decode URLsUUID generatorRandom or time-ordered UUIDs in bulkHash generatorMD5 and SHA checksums for text and filesUnix timestamp converterConvert epoch time to dates and backJWT decoderRead a JWT’s header, payload and expiryRegex testerTest and debug regular expressionsDiff checkerCompare two texts and see what changed
Frequently asked questions
Are these developer tools free?
Yes, completely free with no sign-up and no limits.
Is the data I paste uploaded?
No. Every developer tool runs in your browser, so tokens, keys and data stay on your device.
Which formats and algorithms are covered?
JSON, Base64 (standard and URL-safe), URL encoding, UUID v4 and v7, MD5, SHA-1 and SHA-2 hashes, Unix timestamps in seconds or milliseconds, JWTs and JavaScript regular expressions.