JWT Decoder & Inspector

Paste a JSON Web Token (JWT) to decode its header and payload, and check its expiry. Everything runs locally in your browser — the token never leaves your device.

Note: Decoding a JWT only reads its public, base64url-encoded parts. This tool does not verify the signature — it simply decodes and formats the claims so you can inspect them. Never paste a token you don't trust into an online decoder that sends data to a server; this one stays fully offline.