Frequently Asked Questions

SSL Checker is a professional tool that checks SSL/TLS certificates of websites for free. It provides detailed SSL Labs style reports.

Yes, SSL Checker is completely free. All features are available to everyone.

An SSL (Secure Sockets Layer) certificate is a security protocol that encrypts data communication between websites and users.

The SSL score is calculated based on factors such as protocol support, key exchange strength, cipher suites, and security headers. A+ is the highest, F is the lowest score.

TLS 1.3 and TLS 1.2 are recommended. SSL 2.0, SSL 3.0, and TLS 1.0/1.1 should be disabled due to security vulnerabilities.

Yes, REST API access is available. You can visit our API page for API documentation.

SSL check results are temporarily cached and usually automatically deleted after 1 hour.

By default, port 443 (HTTPS) is checked. You can also check ports such as 8443, 993, 995, 465, 587.