SSL Certificate Checker completely free with no registration. Process data securely in your browser.
100% free, no signup required. Works entirely in your browser.
Open SSL Certificate CheckerType the domain to check.
SSL certificate is inspected.
See expiration, issuer, and chain info.
The tool inspects multiple aspects of an SSL/TLS certificate including validity dates, issuer information, subject alternative names (SANs), key strength, signature algorithm, and certificate chain completeness. It also checks for common misconfigurations like expired certificates, weak cipher suites, and missing intermediate certificates that can cause browser warnings.
Yes, the entire certificate chain is validated from the leaf certificate through intermediate certificates up to the trusted root CA. This is critical because missing or incorrect intermediate certificates are one of the most common SSL configuration errors. The tool identifies chain issues that browsers may handle differently.
Check your SSL certificates at least monthly, and set up automated monitoring for expiration warnings at 30, 14, and 7 days before expiry. Certificate expiration is the leading cause of unexpected HTTPS errors in production. If you use Let's Encrypt or similar auto-renewal services, regular checks ensure the renewal process is functioning correctly.
