Accepted input

Accepts compact JWT strings with three dot-separated segments. Invalid structure or malformed Base64URL content is reported inline.

How to use

1. Paste the token into the input editor.
2. Review the decoded header, payload, and calculated expiry information.
3. Copy or download the decoded JSON if you need it for debugging notes.
4. Clear the editor when working with a new token.

Tips

• Use the advanced Base64 / JWT Playground when you also need encoding utilities or signature inspection.
• Treat tokens as sensitive even though decoding happens locally.