Free Tool Guide
•
5 min read
How to Use the Free SSL Certificate Checker
Confirm a site's certificate is valid and find out exactly when it expires.
Try the Tool Now
Free, no signup required
An expired SSL certificate is one of the fastest ways to lose visitors. Browsers throw a full-page security warning, and most people back out immediately — it also undermines trust signals that matter for SEO.
The SSL Certificate Checker opens a live TLS connection and reports exactly what the server is presenting — no guesswork.
What the checker tells you
- Status — valid, expiring soon, or expired
- Days until expiry — so you can renew before it bites
- Issuer & subject — who issued the cert and to whom
- SANs — every hostname the certificate covers
- Trust chain — whether the cert validates against a trusted CA
Why it matters for SEO and trust
- HTTPS is a ranking signal — a broken cert puts it at risk
- Warnings crush conversions — users rarely click through them
- Renewals get forgotten — checking expiry early avoids outages