JWT Decoder
Decode JWT tokens online. Inspect header, payload, and all claims including exp, iat, and nbf shown as human-readable dates. Free JWT decoder — no upload required.
Paste any JWT (JSON Web Token) to instantly decode the header and payload claims. The decoder displays all fields in readable form, including expiry (exp), issued-at (iat), and not-before (nbf) timestamps converted to human-readable dates. Useful for debugging authentication flows, inspecting OAuth 2.0 and OIDC tokens, and verifying claims during development. Decoding happens entirely in your browser — no server request is made.
Frequently Asked Questions
- Does the JWT Decoder verify the signature?
- No — the decoder only decodes and displays the header and payload. Signature verification requires the secret or public key, which should never be pasted into an online tool.
- What JWT algorithms are supported?
- The decoder displays tokens signed with any algorithm (RS256, HS256, ES256, etc.) since it decodes the base64url payload directly without verifying the signature.
- Is this tool free to use?
- Yes, all tools on Here Be Tools are completely free with no signup or account required.
- Is my data sent to a server?
- No. All processing happens locally in your browser. No data you enter is ever transmitted to any server.