JWT Decoder

Paste a JWT to read its header and payload. Decoding stays in the browser. Signature checks still belong on your server, because this page only shows what is inside the token.

JWT token

Header

Payload

Signature

How to use it

Paste a token that has three dot-separated parts.
Read the decoded header and payload.
Copy either section if you need it elsewhere.

Useful for

Inspect exp and sub claims
See which algorithm the header names
Debug a token without sending it to a website

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Questions about JWT Decoder

Can this verify my JWT signature? +

This tool decodes and displays claims locally. Signature verification requires your secret/key and is intentionally not uploaded.

Is the token transmitted to a server? +

No. Decoding uses base64url parsing entirely in your browser.