Authentication
JWT Decoder
Inspect JWT headers and payloads locally, without verifying or uploading tokens.
What is JWT Decoder?
Decode a JSON Web Token's Base64URL header and payload in your browser. This tool does not validate a signature or send the token anywhere, so it is intended for safely inspecting token contents.
How to use JWT Decoder
- Paste or type your input into the editor.
- Use the tool action to process your data in the browser.
- Review the output, then copy or download it if needed.
Key features
- Private browser-based processing.
- No account or login required.
- Works without uploading your data.
- Fast results for common developer tasks.
Frequently asked questions
Does this verify the JWT signature?
No. It only decodes the visible header and payload. Never treat a decoded token as trusted unless its signature is verified by your application.
Is my token uploaded?
No. Decoding happens in your browser and the token is not sent to a server.