JWT Decoder
Decode JSON Web Tokens (JWT) instantly to view their header and payload. Client-side only.
How JWT Decoder Works
Paste your JWT string to instantly decode it. We split the token into its three parts (Header, Payload, Signature) and Base64-decode the first two to show you the JSON contents.
Security Note: We decode the token locally in your browser. We do NOT verify the signature, as that requires your secret key. Never share your secret key with any online tool.
Frequently Asked Questions
Is it safe to paste real tokens?
Yes. Since the validation happens 100% in your browser, your tokens are never sent to any server.