Enter any domain name and instantly see its SSL certificate status, expiry date, issuer, and chain of trust. Catch problems before your visitors do.
See exactly how many days remain before the certificate expires — critical for avoiding unexpected browser warnings.
Identify which Certificate Authority issued the certificate and verify it is from a trusted, recognized CA.
Verify that the full certificate chain (root → intermediate → leaf) is correctly configured and trusted by browsers.
The most common causes are an incomplete chain (missing intermediate certificate), an expired certificate, or a mismatch between the domain on the certificate and the domain you are checking. Our tool flags each of these separately.
At minimum, check 30 and 7 days before expiry. Better practice is to set an automated reminder — use our free SSL Expiry Reminder tool to get email alerts automatically.
Yes. Enter the full subdomain (e.g. mail.example.com) and the tool checks that specific certificate. For wildcard coverage, the result will show *.example.com as the subject.
SSL certificates are generally issued to domain names, not IP addresses (with narrow exceptions). Entering a raw IP usually won't return a valid match — use the domain name instead.
Browse all certificate types or take the 60-second quiz to find the right one.