SSL Certificate Checker
Frequently Asked Questions about SSL Checker
What does the SSL checker verify?
The tool performs an in-depth analysis of the domain's SSL/TLS certificate: it checks validity status, issue and expiration dates, issuing Certificate Authority (CA), signature algorithm, and Subject Alternative Names (SAN).
Why is timely SSL renewal critical for SEO?
An expired certificate causes modern browsers to block users with severe security warnings (NET::ERR_CERT_DATE_INVALID). This triggers an immediate spike in bounce rates, lost traffic, and potential ranking drops in Google.
What does an incomplete certificate chain error mean?
A chain issue occurs when the web server serves the leaf certificate without the required intermediate CA certificates. While some desktop browsers cache intermediates, mobile browsers often throw certificate errors.
Can I check subdomains and wildcard certificates?
Yes, you can enter any subdomain (e.g. sub.example.com). The checker verifies whether it is protected by a dedicated certificate or covered under a wildcard (*.example.com).
How does bulk SSL certificate checking work?
In bulk mode, you can paste up to 100 domains or upload a CSV file. The system checks the certificate expiration and health for all sites and exports a clean CSV report.
The SSL Checker inspects the certificate presented by a domain over HTTPS. It helps confirm who issued the certificate, which hostnames it covers, when it becomes valid, when it expires, and whether the server presents a certificate appropriate for the requested address. Certificate problems can trigger browser warnings, interrupt payments or logins, and block crawlers from accessing pages securely.
Enter the hostname to review the available certificate details before and after renewal or migration. Check the exact subdomain, because coverage for the root domain does not always include every host. A valid certificate is only one part of HTTPS configuration; mixed content, obsolete protocols, incomplete chains, and incorrect redirects may require additional server-level testing.