JWT Decoder
Paste a JWT, see its header, payload and expiry. Free.
🔒 Private by design: this tool runs 100% in your browser — your token is never uploaded anywhere.
Free online JWT decoder
This free JWT decoder splits a JSON Web Token into its three parts — header, payload and signature — and shows the decoded JSON. It also reads the exp claim and tells you whether the token is expired.
JWTs are used for login sessions and APIs. Decoding one is safe to do here because the token never leaves your browser.
Frequently asked questions
What is a JWT? A compact token with three base64url parts: header, payload and signature, separated by dots.
Can this tool verify my token? No — verification needs the secret key, which you should never paste anywhere. This tool only decodes.
Is it safe to paste a real token here? Yes for inspection, since nothing is uploaded. Still, never share live production tokens publicly.