Check the SSL certificate of any domain
Free SSL certificate check — validity, issuer, SAN domains and expiration date
Enter a domain name in the field below. The tool connects to the server, downloads the live SSL certificate and presents its key details — with nothing to install on your machine.
What does the SSL certificate checker verify?
The SSL checker shows whether the certificate is valid, who issued it (issuer and organization), the domain it was issued for and any additional domains it covers (SAN records). You also see the valid-from and valid-to dates, the number of days until expiration, the signature algorithm, plus a warning if the certificate is self-signed or does not match the domain you checked.
Why check your SSL certificate regularly?
An expired certificate means a browser security warning and an instant loss of visitor trust. This tool lets you quickly diagnose HTTPS problems — an expiring certificate, a broken trust chain or a missing certificate altogether — before your visitors ever notice.