Why does this tool decode but not verify?
Signature verification requires a key or public key. This page is intentionally optimized for quick inspection of readable JWT content.
JWT Decode
Decode JWT headers and payloads locally in your browser to inspect claims without sending tokens to a server.
This tool decodes the header and payload only. It does not verify the signature or claim authenticity.
Signature note
This tool decodes the header and payload only. It does not verify the signature or claim authenticity.
All JWT decoding happens locally in your browser. Tokens are not uploaded.
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When to use JWT decode
Use this page when you want to inspect `sub`, `exp`, `role`, or custom claims quickly without writing a script.
It is useful for test-token debugging, frontend/backend auth checks, and claim mapping reviews.
This tool is a viewer, not a verifier. It decodes readable sections but does not validate the signature.
JWT decode FAQ
Does decoding make a token trustworthy?
No. Decoding only reveals the token contents. Trust still depends on proper signature validation in your auth flow.