About This Tool
This tool decodes a JSON Web Token's header and payload locally so you can inspect its claims without pasting it into a third-party site. It only decodes the token — it does not verify the signature, so it should not be used to confirm a token's authenticity.
How to Use
- Paste a JWT into the input box.
- The decoded header and payload appear automatically below it.
- Click "Copy" to copy either section — remember this only decodes the token, it does not verify its signature.