TLS version & HTTP/2 checker

See which TLS versions a server accepts, which cipher it picks, whether HTTP/2 is on, and whether the certificate is trusted.

Good to know

Should TLS 1.0 and 1.1 be turned off?: Yes. Chrome, Firefox, Safari and Edge stopped supporting them in 2020, and standards like PCI DSS forbid them. Keep TLS 1.2 for older clients and add TLS 1.3.
What does TLS 1.3 change?: It needs one fewer round trip to connect, so pages start loading sooner, and it drops old, weak ciphers entirely.
What is HTTP/2?: A faster version of HTTP that loads many files over one connection. Browsers only use it over TLS, and most servers and CDNs can switch it on with one setting.

Checking by hand only tells you about right now. Spot Downtime checks your sites around the clock and alerts you by email, Slack or Discord.