Verify SSL certificate expiry and validity
SSL/TLS Certificate Checker is a comprehensive security validation tool that analyzes your website's SSL/TLS certificate to ensure proper HTTPS configuration and prevent security warnings. SSL (Secure Sockets Layer) and its successor TLS (Transport Layer Security) encrypt data between web servers and browsers, protecting sensitive information from interception. This checker performs deep validation of certificate chains, expiration dates, issuer hierarchies, domain name matching, and common security misconfigurations. An expired or invalid SSL certificate triggers frightening browser warnings that immediately destroy user trust and drive visitors away from your site. The tool verifies the complete certificate chain from your site's certificate through intermediate certificates up to the trusted root certificate authority (CA) that browsers recognize. SSL certificate validation is essential for e-commerce sites handling payments, membership sites with logins, any site collecting personal data, and all modern websites since Google now flags non-HTTPS sites as "Not Secure". This checker helps system administrators monitor certificate expiration, web developers troubleshoot SSL installation issues, security teams audit certificate configurations, and website owners maintain visitor trust. The tool detects common problems like expired certificates, self-signed certificates, mismatched domain names, incomplete certificate chains, and weak encryption algorithms.