JWT Decoder
Paste a JSON Web Token to instantly decode its header and payload, read standard claims like issuer, audience and subject, and see exactly when it expires.
Runs entirely in your browser — nothing is uploaded.
About JWT Decoder
Paste a JSON Web Token to instantly decode its header and payload, read standard claims like issuer, audience and subject, and see exactly when it expires.
- Decodes the header and payload from any JWT, base64url and all.
- Surfaces standard claims — iss, aud, sub, iat, exp — with a live expiry countdown.
- Runs entirely in your browser. Your token is never uploaded or logged.
JWT Decoder is part of Upwwards Tools, a free collection of browser-based utilities built by the team at Upwwards. Like the rest of the suite, it's free, requires no sign-up, and keeps your data on your device.
Frequently asked questions
What is JWT Decoder?
Paste a JSON Web Token to instantly decode its header and payload, read standard claims like issuer, audience and subject, and see exactly when it expires.
Is JWT Decoder free to use?
Yes — JWT Decoder is completely free with no sign-up, account or usage limits. It is part of the free Upwwards Tools collection built by Upwwards.
Is my data private when I use JWT Decoder?
JWT Decoder runs entirely in your browser. Everything you enter or upload is processed locally on your device and is never sent to a server, stored or logged.
Do I need to install anything to use JWT Decoder?
No. JWT Decoder works instantly in any modern web browser on desktop or mobile — there is nothing to download or install.