How to check if my browser supports HTTP/3?

Use our free HTTP/3 browser check tool to test if your browser supports HTTP/3 and QUIC protocols. Simply visit our site and run the test. Modern browsers like Chrome, Firefox, and Edge support HTTP/3 and QUIC protocols.

A QUIC test verifies if a server or browser supports the QUIC protocol, which powers HTTP/3 connections. Our QUIC test tool checks protocol support, connection performance, and QUIC handshake capabilities.

How do I test HTTP3 online?

To test HTTP3 online, simply enter your domain name in our HTTP/3 check tool above. Our tool will verify if your website supports HTTP/3 and QUIC protocols and provide detailed connection metrics.

HTTP/3 Check - QUIC Browser Test

Test your website and browser for HTTP/3 and QUIC protocol support online - Free browser check tool

Public HTTPS endpoints on port 443 only. Checks are rate limited; please wait if the checker is busy. TLS certificates must be valid.

example.com

check_circle QUIC is advertised or negotiated

check_circle HTTP/3 is advertised or negotiated

HTTP/3 was advertised in the response headers or negotiated for this check. The negotiated protocol was HTTP/3. This check does not measure QUIC connection IDs, packet timing or 0-RTT.

HTTP/3 Server Information

HTTP Version: HTTP/3

Server: cloudflare

Status Code: 200

Response Time: 37.46 ms

Response Headers

Header	Value
date	Mon, 02 Nov 2026 17:53:47 GMT
content-type	text/html; charset=utf-8
priority	u=3,i=?0
server	cloudflare
last-modified	Sun, 01 Nov 2026 22:43:12 GMT
cf-cache-status	HIT
allow	GET, HEAD
accept-ranges	bytes
age	0
cf-ray	a545002ec85b9ac1-FRA
alt-svc	h3=":443"; ma=86400
server-timing	cfExtPri