Skip to content
100% Client-SideZero Network CallsSignature Never Verified

JWT Decoder & Inspector

Paste a token and watch the header, payload, and signature light up in their standard colors while claims decode into readable JSON. This tool is decode-only — signatures are never verified because no secret ever reaches (or leaves) your browser.

  • Works offline

    Disable your Wi-Fi — decoding keeps working in this tab.

  • Zero network calls

    Tokens are parsed in-memory; verify it in your DevTools.

  • Decode-only by design

    No secrets required; signatures are never verified here.

Encoded token

  • Header
  • Payload
  • Signature

Paste a token on the left — the header and payload decode instantly, entirely in your browser. Nothing is ever transmitted.