Free SSL Certificate Checker Online — Validate HTTPS Certificates
SSL Certificate Checker
Free SSL certificate checker
Inspect issuer, validity dates, SANs, and trust errors for any public HTTPS host.
Free SSL Certificate Checker for Websites and Security Labs
Free SSL certificate checker. Inspect issuer, validity dates, SANs, and trust errors for any public domain. Built for website owners, cybersecurity students, and IT admins.
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How to inspect an SSL certificate with confidence
Check the apex and www hosts separately when they use different certificates. After a CDN change, verify the edge certificate, not only the origin. I keep this habit because browsers cache trust decisions and hide intermediate failures.
Certificate mistakes that create support tickets
The most common issue I see is a certificate issued for the apex while www still serves an old or missing name. This SSL certificate checker surfaces SAN mismatches before customers report “Not secure”.