// w-logic free tools

JWT Decoder & Verifier

Decode any JSON Web Token. Inspect header, payload, expiry, and algorithm. Verify HMAC signatures client-side. Your token never leaves the browser.

// client-side only // token never transmitted // algo security check // exp / nbf validation // signature verification

Paste JWT Token

Signature Verification

Algorithm

Secret / Key

Secret Encoding

Signature verification runs entirely in your browser using the WebCrypto API. Your secret key and token are never transmitted to any server. HMAC (HS256/384/512) verification is fully supported. RSA and ECDSA require the public key in PEM format.

Header

Payload

Claims Analysis

Signature

Use the Signature Verification panel above to validate this against your secret key.