Instantly verify any website's HTTPS certificate — expiry, issuer, protocol, and security grade.
Works with any domain. No login or account required.
An expired certificate causes browsers to show a scary warning, driving users away and destroying trust.
Older TLS versions (1.0, 1.1) are insecure. TLS 1.3 is the current gold standard for encrypted connections.
Check the certificate of any site you're about to enter sensitive data into — verify it's issued by a trusted CA.
A wildcard cert (*.example.com) covers all subdomains. Verify yours covers exactly the domains you need.