Loading tools...
Loading tools...
Preview your website across mobile, tablet, and desktop breakpoints. Spot responsive issues before your users do.
URLs load directly in your browser via iframes. Nothing is sent to our server.
Enter a URL above to see how it looks across different device sizes.
From responsive design to pixel-perfect implementations — we help teams build websites that work beautifully everywhere.
Test your site at every breakpoint — no dev tools required.
See mobile, tablet, and desktop views together on one screen.
No server calls needed — iframes load directly in your browser.
Enter any custom width and height to test specific breakpoints.
Quickly spot layout issues at different screen sizes.
Just enter a URL — no browser extensions or downloads needed.
URLs load in your browser only. Nothing is sent to our servers.
Common questions about responsive preview testing
Some websites set X-Frame-Options or Content-Security-Policy headers that prevent them from being loaded in iframes. This is a security feature of those sites. You can still open them in a new tab to test manually.
Similar concept, but this tool lets you see all three breakpoints at once without toggling. It's also shareable — just send the URL to your team.
By default we test Mobile (375x667), Tablet (768x1024), and Desktop (1440x900). You can also enter custom dimensions using the custom viewport option.
The preview uses real iframes at actual viewport widths, scaled down to fit your screen. CSS media queries will fire at the correct breakpoints, giving you an accurate representation.
No. The URL you enter is loaded directly in your browser via iframes. We don't proxy, store, or log any URLs or page content.
We build custom web applications, design systems, and responsive websites for startups and enterprises.
Disclaimer: This tool is provided for informational and educational purposes only. Preview renderings are approximations and may differ from actual platform displays due to platform updates, caching, or rendering differences. We fetch publicly available metadata and do not store or share your URLs. Platforms may cache old data even after you update your content—use their official debug tools to refresh caches. ZIRA Software is not liable for any decisions made based on this tool's output.