JWT Decoder
Decode a JSON Web Token, inspect its claims and expiry, and verify its signature. Runs entirely in your browser: tokens and keys are never sent to a server.
Decode Instantly
See the header and payload as formatted JSON, with registered claims explained.
Expiry at a Glance
Timestamps are converted to readable dates, with clear expired and not-yet-valid states.
Private by Design
Decoding and signature checks use your browser's Web Crypto. Nothing is uploaded.