Secure JWT Decoding Tool
Welcome to our free online JWT Decoder. Easily inspect the contents of your JSON Web Tokens without compromising security.
How It Works
A JSON Web Token (JWT) is composed of three parts separated by dots (`.`):
- Header: Contains metadata about the token, such as the algorithm used for signing (e.g., HS256 or RS256).
- Payload: Contains the claims, which are statements about an entity (typically, the user) and additional data.
- Signature: Used to verify the token's integrity (not displayed by this tool as it requires your private secret).
This tool automatically splits the token, converts the Base64Url encoding into standard Base64, decodes it, and displays the underlying JSON structure.
100% Client-Side Privacy
JWTs often contain sensitive user data. Our decoder runs entirely in your browser using JavaScript. Your token is never sent to any server, meaning your data remains strictly on your device.