Test how your website looks on different screen sizes and devices. Preview your site on mobile, tablet, and desktop resolutions with a single click. Perfect for web developers and designers to ensure responsive design compatibility.
This tool helps web developers and designers test their websites across different screen sizes and device resolutions. Simply enter a URL and instantly preview how your site appears on various devices from mobile phones to ultra-wide desktop monitors. All testing happens in your browser — no data is sent to any server. Use this tool during development to catch responsive design issues before they reach your users.
You can test most websites. However, some websites block iframe embedding via X-Frame-Options or Content-Security-Policy headers for security reasons. If a site does not load, it is likely blocking iframe access and cannot be tested in this manner.
Yes. The website preview uses a standard browser iframe. The target website loads directly in your browser, and no data passes through our servers. However, the target website may see your IP address and browser information as if you visited it normally.
Some websites explicitly block iframe embedding to prevent clickjacking attacks. This is a security feature, not a bug. Major sites like Google, Facebook, and banking websites typically block iframe access. Try testing with your own websites or smaller sites.
The sizes represent the logical viewport dimensions (CSS pixels) for each device, not the physical screen resolution. Modern devices use device pixel ratios (DPR) that make physical pixels denser, but the logical viewport size is what matters for responsive design testing.