Utilities
Developer Tools
A small kit of everyday utilities that run entirely client-side — nothing you paste ever leaves your browser.
JWT Decoder
Runs locallyPaste a JSON Web Token to inspect its header and payload. Nothing leaves your browser — no signature verification is performed.
JSON Formatter & Validator
Runs locallyPretty-print, minify, and validate JSON. Errors point to the line.
Base64 Encoder / Decoder
Runs locallyEncode text to Base64 or decode it back. UTF-8 safe.
Output
Hash Generator
Runs locallySHA-1, SHA-256, SHA-384, and SHA-512 digests of any text (UTF-8).
Digest (hex)
UUID Generator
Runs locallyCryptographically-random version-4 UUIDs.
Unix Timestamp Converter
Runs locallyConvert between epoch seconds/milliseconds and a human-readable date.
Current epoch: —
Local: —
UTC: —
Seconds: —
Milliseconds: —