Add your page
Type a website address, or paste your HTML or open an .html file.
Enter an address or paste your HTML and see it at the exact screen size of a popular phone. Switch phones, rotate to landscape or drag to any width.
Content wider than the screen and a missing viewport tag are flagged, so you know what to fix before visitors notice.
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Type a website address, or paste your HTML or open an .html file.
Choose a phone from the list, rotate it, or drag the frame's edge to try any width.
Read the warnings, edit the HTML and watch the frame update. Save a screenshot when it looks right.
When the page works at every size, create the images and clips it needs with WaveSpeed AI.
Make hero images, illustrations and banners in any aspect ratio.
Turn a product shot into a short clip for the landing page.
Turn a product photo into a 3D model for an interactive page.
$1 in free credits for eligible new accounts. No card needed. Generators have separate account and credit requirements. The Responsive tester is free.
Enter your site's address or paste your HTML, pick a phone from the list and see the page at its exact screen size. Rotate to landscape or drag the frame to any width.
The page is shown at the phone's screen width and height in CSS pixels, so media queries and layouts react exactly as they would on that phone.
It probably lacks the viewport meta tag. Without it, phones lay the page out about 980 pixels wide and shrink it. The tester warns you when pasted HTML has no such tag.
Some sites choose not to be shown inside other pages. Open "Why is it blank?" to check the site's headers, or paste the page's HTML instead.
Yes. No account and no limits. Pasted HTML stays in your browser, and websites load directly from their own servers with no proxy.
Phone screen sizes · Portrait & landscape · Overflow warnings