Analyze HTML
Live Device Preview
Checklist
Desktop (1280px)
Tablet (768px)
Mobile (375px)
Best-effort: many sites send an
X-Frame-Options or Content-Security-Policy header that blocks embedding entirely — if a frame stays blank, that's the site refusing to be framed, not a bug here. When it works, this shows the real, live page at each width.
The "Analyze HTML" tab checks the actual markup for the signals that matter — viewport tag, tiny fonts, disabled zoom, and responsive media queries. Runs entirely in your browser.
