Decode JWT Tokens Online — No Upload, Browser-Based, Free
Decode any JSON Web Token instantly in your browser. View header, payload, claims and expiry status — your token never leaves your device, no sign-up needed.
Frequently Asked Questions
Is it safe to paste my JWT token into this tool?
For sensitive production tokens, always use a local tool. This decoder runs entirely in your browser — tokens are never sent to a server. However, as a best practice, never paste live admin or API tokens into any third-party tool.
What does decoding a JWT tell me?
JWT decoding reveals the header (algorithm used), payload (claims like user ID, roles, expiry), and whether the signature structure is valid. It does NOT verify the signature without the secret key.
Can I verify a JWT signature here?
Currently the tool decodes and displays the JWT structure. Signature verification requires the secret key or public key, which you should never paste into a web tool.
Why does my JWT say "expired"?
JWTs contain an "exp" claim (expiry timestamp). If the current time is past this timestamp, the token is expired and will be rejected by most servers.
