Checker Tools

HTTP/2 Checker

Verify whether a domain supports HTTP/2 or HTTP/3 with our instant protocol checker. HTTP/2 dramatically improves web performance through multiplexing, header compression, and server push — find out if your site is taking advantage of it.

HTTP/2 Checker

Results

A tool by Digital Checkmark

We keep building free tools

Be the first to know when we launch a new one, plus practical tips to get more out of them. No spam.

How to Use This Tool

Enter a domain name (e.g., example.com)
Click "Check HTTP/2"
See the HTTP protocol version the server supports (1.1, 2, or 3)
Check if the site uses the latest protocol

What is HTTP/2 Checker?

HTTP/2 is the second major revision of the HTTP protocol, standardized in RFC 7540. It addresses key performance limitations of HTTP/1.1 by allowing multiple requests and responses to be multiplexed over a single TCP connection, eliminating head-of-line blocking. HTTP/2 also uses HPACK header compression to reduce overhead and supports server push to proactively send resources. HTTP/3, the latest version, replaces TCP with QUIC for even lower latency. Enabling HTTP/2 on a web server typically requires only a modern web server (nginx, Apache, Caddy) and a valid TLS certificate — and can improve page load speeds by 20–50% without any code changes.

Related Tools