Verify HTTPS connectivity, inspect TLS configuration, and check SSL certificate details for any domain. Instantly see if a site is properly secured.
Enter a domain to check its SSL certificate
Browsers enforce CORS (Cross-Origin Resource Sharing) policies that prevent JavaScript from reading certificate details of third-party domains. Full SSL inspection — including issuer, expiry date, and chain validation — requires a server-side request or native TLS socket access. Our API handles this securely.
SSL/TLS certificates encrypt data between the user's browser and your server, preventing eavesdropping and man-in-the-middle attacks. They also authenticate that your server is who it claims to be. Without one, browsers display "Not Secure" warnings that severely damage user trust and SEO rankings.
Check at least 30 days before your certificate's expiry date. Most certificates are valid for 90 days (Let's Encrypt) or 1–2 years. Set up monitoring to alert you when expiry is within 14 days — expired certificates cause browser security warnings that block visitors entirely.
TLS 1.3 is the latest version of the Transport Layer Security protocol. It's faster (1-RTT handshake vs 2-RTT in TLS 1.2) and removes legacy cipher suites that had known vulnerabilities. Modern servers should support TLS 1.2 at minimum and prefer TLS 1.3 for optimal security and performance.
Our API returns full certificate chain details, expiry dates, issuer info, and TLS version — all as structured JSON. Monitor all your domains programmatically.
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