SSL Certificate Checker
Check any domain's SSL certificate: issuer, validity, days until expiry, TLS protocol, cipher, and a grade. Free, instant.
Frequently asked
What does the grade mean?
A = healthy cert + modern TLS. B = working but minor issue. C = multiple warnings. F = expired or invalid.
Does this work for subdomains?
Yes. Enter the full hostname (e.g. www.example.com) to test that specific cert + SAN.