JWT Decoder
Paste a JWT. We’ll decode header and payload without secret.
Header
Payload
Signature (hex)
GuideHow to Read Base64 Data and JWT Tokens
Read guide →
Distinguish encoding from encryption and inspect JWT header and payload data without assuming signature validity.
Frequently asked questions
Is verification performed?
This tool only decodes. Verification requires the correct signing key and is out of scope.
Is it safe to paste tokens?
Avoid pasting production tokens. Prefer staging/sanitized examples.
What does the JWT Decoder do?
Decode JWT header and payload sections for inspection without claiming to verify the token signature.
How should I interpret a JWT Decoder result?
Read the displayed labels and validation messages together, then verify important findings against the original source. The result is a practical aid, not proof beyond the data it can inspect.
What can affect the JWT Decoder result?
Decoding exposes token fields but does not verify the signature, issuer, audience, expiry enforcement, or current authorization.
Where can I learn more about using the JWT Decoder?
Read “How to Read Base64 Data and JWT Tokens” for a practical workflow, limitations, and checks to make after using the tool.