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HTTP/2 & TLS Version Test

See which TLS versions a site accepts and whether it serves HTTP/2.

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About the HTTP/2 & TLS Version Test

Run a full server-side handshake test against any public domain: which TLS versions are enabled, whether deprecated SSL 3.0, TLS 1.0 and 1.1 are still accepted, which protocols are advertised over ALPN including HTTP/2, plus forward secrecy, OCSP stapling, HSTS and known protocol vulnerabilities. Each IP address behind the domain is graded separately.

Examples

Test a site

example.com

Output

TLS 1.2 and 1.3 enabled, HTTP/2 supported, grade A+

Keyboard shortcuts

  • Copy the main outputCtrl / ⌘ + Shift + C
  • Download the resultCtrl / ⌘ + S
  • Share this toolCtrl / ⌘ + Shift + S
  • Reset the inputsAlt + R
  • Open the tool search paletteCtrl / ⌘ + K

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Frequently asked questions

Version 1.0.0 · Updated 2026-09-16 · Runs entirely in your browser