This TLS Test test tool allows you to check which TLS protocol (e.g TLSv1.0, TLSv1.1, TLSv1.2, TLSv1.3) is enabled on your website. It also checks SSL protocols such as SSLv2 and SSLv3. SSL procotols have been deprecated by IETF and thus should be disabled. Same is for TLSv1.0 and TLSv1.1, you should use TLSv1.3 and TLSv1.2 for drawback compatibility with some devices. Just enter the domain, such as google.com and press the button.