HTTP/2 Checker
Check whether a website is using the new HTTP/2 protocol or not.
About the Free Online HTTP/2 & HTTP/3 Checker
The Big Free Tools HTTP/2 Checker is a diagnostic tool intended for web developers, system administrators, and performance optimizers. It will connect to any target website over TLS and examine the network protocol negotiated to determine if your server supports newer technologies such as HTTP/2 or HTTP/3 (QUIC), or if it defaulted to old-school HTTP/1.1.
Why HTTP/2 and HTTP/3 Matter for Speed & SEO
Request multiplexing: As HTTP/1.1 cannot multiplex multiple requests and responses over a single connection, new TCP connections need to be opened for parallel downloads of the page assets. HTTP/2 provides this feature.
Header Compression (HPACK): HTTP/2 compresses repetitive HTTP header information so the packet overhead is minimized and the TTFB is faster.
Moving HTTP/3 off TCP and onto UDP eliminates packet-loss stalls on mobile and flaky internet connections, which improves your Core Web Vitals score.
Faster delivery of assets and lower latencies have an immediate impact on UX, lower bounce rate, better ranking on mobile.
How to Test for HTTP/2 Support Online
In the input above, type your webpage, or domain (like bigfreetools.com).
Run Protocol Test: Click Check HTTP/2 to perform a secure TLS handshake with the server.
Check Results: Instant status badges indicate whether a server is currently serving traffic via h2, h3, or historical http/1.1.
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