Verify a signature
message = Important documentsignature = abc123...publicKey = {"kty":"RSA","n":"...","e":"..."}
Result: true if the signature is valid.
RSA-PSS Verify
Verify a message signature using the signer's 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 does "valid signature" mean?
A valid signature means the message was signed by the holder of the matching private key and has not been modified since signing.
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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