Can this tool verify the signature of my JWT?

No. This tool only decodes the Base64 payload. It does not verify the cryptographic signature against a secret key.

Is it safe to paste production tokens here?

Yes. All processing is strictly done on the client-side (in your browser memory). The token is never transmitted over the internet.

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Developer Tools

Decode JSON Web Tokens (JWT) securely in your browser to inspect their header and payload.

Last updated July 31, 2026

100% secure: Decoding happens entirely in your browser. Your sensitive tokens are never sent to our servers.
Formats the decoded JSON beautifully for easy reading.
Instantly catches formatting errors or invalid tokens.

Debugging authentication

Verify that the token your API generated contains the correct user claims and expiration time.

Auditing third-party tokens

Check the payload of OAuth tokens from providers like Google or Auth0.