JWT Decoder
Paste a token to inspect its header and payload. Everything stays in your browser.
Free, no signup needed. Runs 100% in your browser.
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How to use this tool
- Paste your JWT.
- Read the decoded header and payload.
- Check expiry claims.
Frequently asked questions
Is my token sent to a server?
No. Decoding is fully client-side. Still, avoid pasting production secrets into any web page.
Does it verify the signature?
No. It decodes the payload so you can inspect claims. Verify signatures on your server.
Is it free?
Yes, free with no signup.
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