JWT Decoder
input — jwt-decoder
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## What is JWT Decoder?
JWT Decoder is a free online tool that decodes JSON Web Tokens (JWT) into their component parts: header, payload, and signature. It displays the decoded data in a readable format and checks token expiration status.
## How to use
- Paste your JWT token in the input panel
- The header, payload, and signature are displayed automatically
- Expiration status is shown if the token has an 'exp' claim
- Click Copy to copy any decoded section
## FAQ
Is my JWT safe?
Yes. All processing happens entirely in your browser. No data is sent to any server. Your token never leaves your device.
Does this verify the signature?
No. This tool only decodes the JWT. Signature verification requires the secret key or public key, which should never be shared in a browser tool.
What JWT algorithms are supported?
This tool decodes all JWT tokens regardless of algorithm (HS256, RS256, ES256, etc.) since decoding only requires Base64URL decoding.