Http2 Checker
Free online Http2 Checker tool.
About Http2 Checker
Free online Http2 Checker tool.
Http2 Checker confirms whether a website has upgraded to the HTTP/2 protocol and what it negotiated during the handshake. Enter an address and the tool performs a TLS handshake, reads the negotiated protocol from the ALPN extension and reports HTTP/2, HTTP/3 or an older HTTP/1.1 result, along with the certificate issuer, the cipher suite and how long the handshake took. Knowing the protocol matters because HTTP/2 multiplexes many requests over one connection, which usually speeds up asset loading on image heavy pages. If a site still answers with HTTP/1.1, the tool points out that a server upgrade, a CDN setting or a missing TLS configuration is likely responsible. Http2 Checker is free, needs no installation, and is useful during performance audits and hosting migrations.
How to Use Http2 Checker
- Enter the host, IP address, URL or port you want to inspect.
- Choose any options the tool offers (protocol, count, depth).
- Run the check — results appear as the browser completes the request.
- Copy the report or note down the details you need.
Key Features
- No terminal or admin tools needed — everything happens in the page.
- Clear, readable results instead of raw command output.
- Checks run from your browser, reflecting what a real visitor experiences.
Frequently Asked Questions
Does Http2 Checker also detect HTTP/3 support?
Yes. The tool reports the protocol actually negotiated during the TLS handshake, so a site offering HTTP/3 through QUIC is identified as such, while servers still speaking HTTP/1.1 are flagged for an upgrade. It also returns the certificate authority, cipher suite and handshake timing, which helps when you are comparing a new CDN against your previous host.
Is Http2 Checker free to use?
Yes. Http2 Checker is completely free with unlimited use — no account, download or payment required.
Is my data uploaded to a server?
No. Http2 Checker runs entirely in your browser. Your inputs are never sent to our servers or stored anywhere.
Does Http2 Checker work on mobile?
Yes. The interface is fully responsive and works in any modern browser on Android, iPhone, tablets and desktops.