SSL Checker examines a domain’s SSL/TLS certificate to confirm if it’s valid, properly installed, and not expired. By verifying certificate details—like the issuing authority, encryption strength, and expiration date—it ensures visitors’ connections are secure. Many modern browsers label unencrypted sites as “Not Secure,” so SSL is essential for user trust and SEO. If the certificate is close to expiring or incorrectly configured, this tool alerts you to fix it before visitors see security warnings. Keeping SSL certificates in good standing maintains data protection, user confidence, and compliance with search engine expectations.