🆓 Free tool · 3 runs per day without registration

SSL/TLS Check

Verify certificate, supported protocols, cipher suites and known vulnerabilities.

SSL/TLS Check: free verification of the certificate and TLS protocols

SSL/TLS Check is a free tool that verifies a server's HTTPS certificate: common name, issuing authority, validity dates, Subject Alternative Names and chain validity. It also probes which TLS protocol versions (1.0, 1.1, 1.2, 1.3) the server accepts, flagging obsolete and insecure protocols.

What the SSL/TLS check is for

An expired certificate or a weak TLS configuration undermine security and user trust, and browsers block insecure sites. Monitoring certificate expiry, disabling TLS 1.0 and 1.1 and enabling TLS 1.3 are essential tasks for every HTTPS site. The tool catches these issues before they affect users.

How SSL/TLS Check works

Enter a domain or host:port and the tool opens a TLS connection, extracts the presented certificate, verifies its validity and expiry, and attempts a handshake with each protocol version to determine which are supported. Every result comes with a score and concrete recommendations.

100% free tool: 3 checks per day with no sign-up, 50 per session with a free account.