⚠️ Security Notice
Paste tokens from untrusted sources at your own risk. This tool runs entirely client-side - your tokens are never sent to any server.
Token Metadata
HEADER (Algorithm & Type)
PAYLOAD (Claims & Data)
SIGNATURE (Verification)
Verify Signature (HMAC Only)
Note: Signature verification only works for HMAC algorithms (HS256, HS384, HS512). RSA/ECDSA verification requires private keys and is not supported in client-side JavaScript.