Sign a message
message = Important dataprivateKey = {"kty":"EC","crv":"P-256","d":"..."}
Result: Base64-encoded signature.
ECDSA Signature
Sign a message using ECDSA with SHA-256. Paste your private key (JWK format) and the message to sign.
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
Is ECDSA secure?
Yes, ECDSA is considered secure when implemented correctly. The P-256 curve provides approximately 128 bits of security, equivalent to RSA-2048.
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