100% on-device

JWT decoder

Decode the header and payload, see every claim explained with real dates and a live countdown to expiry, and verify the signature against a secret or public key — all without the token ever leaving this tab.

Runs entirely in this tab. What you paste is never sent anywhere.

Token

Nothing is sent anywhere, and the token is never written to the URL or to storage — so there is no share link that could leak it.