SSL Certificate Checker

Check an HTTPS certificate: validity, expiry date, issuer, covered domain names, key and TLS version.

Processed on our server. Your input is sent securely to our server for processing. Uploaded files are deleted automatically.

Requests are made from this website’s server. Only public web addresses can be checked; results are not stored.

How to use the SSL Certificate Checker

Enter the domain.
Click Check certificate.
Review validity, days until expiry and the certificate chain.

Our server opens a TLS connection on port 443 with SNI, verifies the certificate against trusted authorities and shows its details. Renew certificates well before expiry; automated issuers such as Let’s Encrypt renew every 60–90 days.

Frequently asked questions

What if the hostname does not match?

Browsers show a security warning. The certificate must list the exact domain or a matching wildcard in its Subject Alternative Names.