Free qa tool
Responsive checker
A fast visual sanity check across common breakpoints. Some sites block embedding; the tool tells you when that happens.
Last updated October 31, 2026
How it runs
This tool runs entirely in your browser. Your input is not uploaded or stored.
QA · runs in your browser
free · no accountSome sites block embedding with X-Frame-Options or CSP. If the frame is blank, open the page in a new tab .
FAQs
Why is the site blank?+
The site may send X-Frame-Options or CSP frame-ancestors, which prevents embedding. Use the open-in-new-tab link.
Does it change the site's CSS?+
No. It only changes the iframe viewport size; the site's own media queries respond.
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