Free JWT Decoder & Verifier Online
Decode and verify JWT tokens instantly. Inspect headers, payloads, and signatures with syntax highlighting. No signup required.
JWT Token
How to Use
Paste JWT Token
Enter your JWT token in the input field
Decode Token
Click decode to extract header and payload
Inspect & Copy
Review decoded data and copy or download as needed
Instant Decoding
Decode JWT tokens instantly with proper base64url decoding
Token Validation
Automatic validation of token expiry and structure
Privacy First
All processing happens in your browser. No data is sent to servers
Frequently Asked Questions
What is a JWT token?
JWT (JSON Web Token) is a compact, URL-safe means of representing claims to be transferred between two parties. It consists of three parts: header, payload, and signature.
Can this tool verify JWT signatures?
This tool decodes JWT tokens and validates their structure and expiry. Full signature verification requires the secret key, which should never be shared publicly.
Is my JWT token secure?
Yes! All decoding happens locally in your browser. Your JWT token is never sent to any server or stored anywhere.
What information is in the JWT payload?
The payload contains claims about the user and additional metadata. Common claims include sub (subject), iat (issued at), exp (expiration), and custom application data.