Enter a domain name to inspect its SSL certificate - issuer, validity dates and days remaining.
The SSL Checker connects to any domain on port 443 and reads its live SSL/TLS certificate - showing the common name, the issuer organization, the valid-from and valid-to dates, the days remaining, and every domain covered by the certificate (Subject Alternative Names). Check before your certificate expires, not after your visitors see a warning.
How to use: 1) Enter a domain name, e.g. example.com (no need for https://). 2) Click submit. 3) Review the certificate table: a green Valid badge means all good, amber Expiring soon means renew within 30 days, and red Expired means fix it immediately.
Why check SSL certificates? An expired certificate breaks your site for every single visitor - browsers display a full-page "Your connection is not private" warning, and the vast majority of people leave immediately instead of clicking through. Certificates from providers like Let's Encrypt expire every 90 days, and auto-renewal fails silently more often than anyone admits - a cron job breaks, a DNS challenge fails, and nobody notices until traffic collapses. A ten-second check beats discovering the outage from an angry customer, and regular checks are simply part of professional site maintenance.
Key benefits: Reads the actual certificate your server presents right now - live data, not a cached database - including the issuer organization and the full SAN list so you can confirm that www, the apex domain and subdomains are all covered. The days-remaining figure with color-coded status makes it obvious at a glance when action is needed. The check runs from FistHost's own server with a 10-second timeout, so results reflect what the public internet sees, and nothing you enter is stored or logged.
Pro tips: Check your certificate monthly, or better, set a calendar reminder 30 days before expiry - monitoring beats emergency renewals. After renewing, re-run the checker to confirm the new certificate is actually being served; stale caches and forgotten load balancers are classic gotchas. If the SAN list is missing a subdomain, visitors to that subdomain will see warnings even though the main domain is fine - reissue the certificate with all names included.
FAQs: What does "Expiring soon" mean? Thirty days or fewer remaining - start the renewal process now to avoid any gap. Why does it say it cannot connect? The domain may have no SSL certificate, may block port 443, or the site may be offline. Does it validate the full chain? It reports exactly what the server presents; pair it with your hosting panel's SSL status for complete confidence. Is the domain I check stored anywhere? No - every check is independent and nothing is logged.
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