HTTP/3 Checker

Check if your site advertises HTTP/3 (QUIC) via the Alt-Svc header. You also get the redirect chain, SSL certificate, and security headers in the same report. Same tool as on the homepage—here focused on HTTP/3 support.

Enter any domain — no signup, results in seconds.

User-Agent:

Also try:

HTTP/2 Checker TLS 1.3 Checker 301 Redirect Checker SSL Certificate Checker Full HTTPS check (redirect + SSL + headers)