The SSL Certificate Checker verifies the SSL/TLS certificate for any domain. It shows whether the certificate is valid, when it expires, who issued it, and what domains it covers via Subject Alternative Names (SANs).

Why SSL Certificates Matter

• Security: SSL/TLS encrypts data between the browser and server.
• Trust: Browsers show a padlock icon for HTTPS sites.
• SEO: Google favors HTTPS sites in search rankings.
• Compliance: Required for PCI-DSS, HIPAA, and most security standards.

Understanding Certificate Expiry

SSL certificates expire — typically after 90 days (Let's Encrypt) or 1-2 years (commercial CAs). When a certificate expires, browsers show a security warning and block access. Use this tool to monitor expiry and renew in advance.