SSL Certificate Checker
Inspect any site's TLS certificate: issuer, dates, days left and SANs.
Handshakes run from our server so browser CORS rules do not get in the way. Free and rate-limited.
About this tool
Free SSL certificate checker. Perform a live TLS handshake and see the certificate subject, issuer, validity dates, days remaining, protocol, cipher, serial number, SANs and fingerprint.
Frequently asked questions
What does it check?
It reads the live certificate presented by the host and reports its issuer, validity dates, days remaining, protocol, cipher, serial, SANs and fingerprint.
Will it flag an invalid certificate?
Yes. We report the certificate even if it is expired, self-signed or does not match the hostname.
Does it send any secrets?
No. Only the hostname you enter is used; no credentials are ever transmitted.
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