JWT Decoder
Decode and inspect JSON Web Tokens without verification. Runs on your device — nothing is uploaded, nothing is stored.
Paste your JWT token to decode and validate
Enter a JWT token to see validation status
Standard Claims
- iss: Issuer - who created the token
- sub: Subject - who the token is about
- aud: Audience - who the token is for
- exp: Expiration time
- nbf: Not before time
- iat: Issued at time
- jti: JWT ID - unique identifier
Security Notes
- • Never share JWT tokens in public
- • Check expiration times
- • Verify the signature in production
- • Use HTTPS for token transmission
- • Store tokens securely
Decode and inspect JSON Web Tokens without verification.
JWT Decoder is a browser-native security tools utility that works the moment the page finishes loading — no account, no email form, no "upgrade to Pro" wall, no watermark on the output. Everything happens inside your own browser tab: the file you drop in is read into local memory, processed there, and handed back as a download. It never travels across the internet, never lands on anyone's server, and nothing about it is stored or logged on our end.
That matters more than it sounds. Most online security tools tools either queue you behind other users on a shared backend, cap the file size to force you onto a paid plan, slap a watermark on the result, or (worst of all) keep your upload around "for analytics". JWT Decoder skips all of that because there is no server to queue on, cap, charge for, or compromise. Your own device does the work, so the only limits are your hardware's and your patience.
It also keeps working with your Wi-Fi turned off. Load the page once, then the tool runs offline — handy on a flight, in a hotel with hostile Wi-Fi, or inside a corporate network where you don't want to involve an outside service in the first place.