HTTP/2 & HTTP/3 Checker

Check if a website supports HTTP/2, HTTP/3, and Alt-Svc.

HTTP/2 and HTTP/3 are modern protocols that significantly improve website loading speed compared to HTTP/1.1. Our protocol checker tests whether a website supports these advanced protocols, checks for HTTP/3 support via Alt-Svc, and reports the negotiated HTTP version.

Result

Enter a URL to check HTTP protocol support.

FAQ

What is the difference between HTTP/2 and HTTP/3?

HTTP/2 improves speed with multiplexing and header compression. HTTP/3 uses QUIC over UDP for even faster connections.