Offline JWT Debugger
Decode and inspect JSON Web Tokens instantly.
100% Client-Side / No Server Uploads
Encoded Token
Decoded Output
HeaderAlgorithm & Token Type
{}PayloadData & Claims
{}SignatureVerify Signature
Signature will appear here...
Frequently Asked Questions
Is it safe to paste JWT tokens here?
Yes. All JWT decoding happens entirely in your browser. Your tokens are never sent to any server, ensuring your authentication credentials remain private.
Can you verify JWT signatures?
This tool decodes and displays the JWT contents. For signature verification, you'll need the original secret key used to sign the token.
What JWT algorithms are supported?
All standard JWT algorithms are displayed, including HS256, RS256, ES256, and more. The algorithm used is shown in the header section.
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