Verify a signature
message = Important datasignature = abc123...publicKey = {"kty":"EC","crv":"P-256","x":"...","y":"..."}
Result: true if the signature is valid.
ECDSA Verify
Verify a message signature using the signer's ECDSA public key. Paste the message, signature, and public key (JWK format) to verify.
Privacy: this tool processes your data entirely in your browser. Nothing you paste or type is sent to the server.
Enter your values and press Calculate — the result appears here.
Worked examples
Frequently asked questions
What if verification fails?
Verification fails if the wrong public key is used, the message was modified, or the signature was created with a different key.
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