JWT Decoder
Decode JSON Web Tokens (JWT) locally to view their header and payload.
Security Warning: Decoding a JWT does not verify its signature. Do not trust the payload unless you verify the signature on your server.
HeaderAlgorithm & Token Type
PayloadData & Claims
Tokens are decoded locally. They are never sent to a server.
How to Use JWT Decoder
- Paste your encoded JWT into the input field.
- The tool instantly decodes the token.
- View the formatted JSON header and payload data.
Key Features
- Decodes JWT header and payload
- Does not verify signature (safe local viewing)
- Zero server upload for absolute security
- Pretty-prints the JSON claims
Privacy First
Your privacy is our priority. This tool processes your files and data entirely locally in your web browser. No files or sensitive information are ever uploaded to our servers, ensuring your data remains completely private and secure.
Frequently Asked Questions
Is it safe to paste my JWT here?
Yes. The token is decoded entirely using JavaScript in your browser. It is never sent to our servers.
Does this tool verify the JWT signature?
No, this tool only decodes the Base64-encoded header and payload for inspection. It does not perform cryptographic verification.