JWT Decoder
Decode JWT tokens locally in your browser. Inspect header, payload and claims, and convert exp/iat/nbf timestamps. Your token is never uploaded.
Your data stays on your device. Nothing is uploaded.
How to Use the Jwt Decoder
1. Upload or paste
Paste a JWT with three dot-separated parts (header.payload.signature).
2. Convert
View the decoded header and payload and inspect claims like exp, iat and nbf.
3. Download or copy
Copy decoded JSON for debugging. Tokens are never uploaded.
Features
Local decode
Decodes JWT header and payload in your browser without sending tokens to a server.
Readable claims
Formats claims clearly and highlights common fields like exp, iat, nbf, aud and iss.
Timestamp help
Quickly interpret exp/iat/nbf values to understand token lifetime.
Base64URL aware
Handles Base64URL encoding used by JWTs.
Copy friendly
Copy decoded JSON with one click for tickets or debugging.
Privacy-first
Designed to keep sensitive tokens on your device.
FAQ: Frequently Asked Questions
No. It decodes the token contents. Signature verification requires the signing key and is not performed here.
No. Decoding runs locally in the browser.
JWT parts are Base64URL encoded. This tool decodes them into readable JSON.
They are standard JWT timestamp claims for expiry, issued-at and not-before times.
Yes. The decoder works on phones, tablets and desktops.