What does the GoChronos SSL Checker do?

The SSL Checker fetches the live TLS/SSL certificate for any domain and displays: the issuer and subject, Subject Alternative Names (SANs), validity period, certificate chain status and the exact number of days remaining until expiry.

How do I know if my SSL certificate is expiring soon?

Enter your domain — the tool shows the expiry date prominently and displays a warning if the certificate expires within 30 days.

What is a Subject Alternative Name (SAN)?

A SAN is a certificate extension that allows a single certificate to cover multiple domain names (e.g. example.com and www.example.com). All modern certificates use SANs instead of the older Common Name field.

Does the checker support wildcard certificates?

Yes. The tool displays the full SAN list, which includes wildcard entries like *.example.com, so you can verify exactly which domains the certificate covers.

Is the SSL checker free?

Yes. Free on GoChronos, no sign-up required.

SSL Certificate Checker — Expiry & Chain

Inspect SSL/TLS certificate details for any domain: validity, expiry, issuer, subject alternative names and certificate chain via crt.sh.