JWT Decoder
Decode JWT tokens to inspect the header, payload and claims like expiry — safely in your browser, never sent anywhere.
How to use JWT Decoder
- Paste a JWT.
- See the decoded header and payload.
- Check issued-at and expiry times in readable form.
Frequently asked questions
Is it safe to paste a real token?
Decoding happens locally and nothing is sent. Still, treat tokens like passwords.
Is JWT Decoder free?
Yes. JWT Decoder is completely free, with no sign-up, no watermark and no usage limits.
Is my data uploaded to a server?
No. JWT Decoder runs entirely in your browser. Your files and text never leave your device.
Does it work offline?
Yes. After Red Cat Tools has loaded once, this tool keeps working without an internet connection. You can also install Red Cat Tools as an app.
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