HTTP/2 Checker

Free HTTP/2 Checker — Test If a Site Uses HTTP/2

This tool checks whether a website is served over the HTTP/2 protocol. Enter any URL and you'll instantly know whether the site is running modern HTTP/2 or still stuck on the older HTTP/1.1 — a difference that can change page-load time by 20–40%.

HTTP/2's big advantage is multiplexing: a single connection carries any number of requests in parallel, eliminating the head-of-line blocking that throttled HTTP/1.1 for two decades. On HTTP/1.1 the browser could only fetch a handful of resources at once and queued the rest; HTTP/2 fetches everything at once and streams responses as they're ready. It also compresses headers and uses an efficient binary format. The result is faster loads with no front-end changes — which feeds directly into Core Web Vitals and rankings.

As of 2026, a meaningful share of sites still serve over HTTP/1.1, leaving real performance on the table. Use this tool to confirm your own server has HTTP/2 enabled, to check a host before you sign up, or to catch a regression where a config change accidentally dropped you back to HTTP/1.1. If you're not on HTTP/2 yet, enabling it is usually a quick config change behind a CDN or in nginx/Apache — not a development project.

From one check to a complete audit

This tool checks one thing. Smart SEO Audit checks 50+ — technical, on-page, content and speed — on any URL in under 10 seconds, with an AI-prioritized fix list, scheduled monitoring and Swiss, GDPR-compliant hosting. Start free — 5 full audits a month, no credit card.