SSL Certificate Checker: What to Look For and Common Problems
What SSL Checker Verifies
Certificate validity: is it trusted by browsers? Expiry date: when does it expire? Subject Alternative Names (SANs): which domains does it cover (www vs. non-www, subdomains)? Certificate chain: are all intermediate certificates properly configured? Issuing CA: is it a trusted certificate authority?
Common SSL Problems
Expired certificate: browsers show 'Your connection is not private'. Domain mismatch: certificate issued for example.com but accessed as www.example.com (or vice versa). Missing intermediate certificate: chain incomplete — some browsers accept, others don't. Self-signed certificate: valid for local development, causes browser warnings in production.
SSL and SEO
HTTPS has been a ranking signal since 2014. Sites without valid SSL certificates lose rankings compared to equivalent HTTPS sites. Certificate expiry causes immediate SEO damage — browsers block users, bounce rates spike, and crawlers may not access the site. Set renewal reminders 30 days before expiry.
Frequently Asked Questions
Check SSL certificate
Use the free SSL Checker to verify certificate validity, expiry, and chain.
Open SSL Checker