JWT Decoder
Decode and inspect JSON Web Tokens instantly. 100% client-side.
Frequently Asked Questions
What is a JWT?
A JSON Web Token (JWT) is a compact, URL-safe token format used for authentication and authorization between parties. It consists of three Base64Url-encoded parts: Header, Payload, and Signature.
Is it safe to decode my JWT here?
Yes! This tool runs 100% client-side — your token is never sent to any server. All decoding happens in your browser.
Can this tool verify the JWT signature?
This tool decodes and displays the JWT contents but does not verify the cryptographic signature, as that requires the signing secret or public key.