Note: Some major sites (like Google or Facebook) actively block embedding. This tool works best for testing your own websites, dev URLs, and open domains.
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Test your UI layouts across multiple devices. Enter a URL below to see how it renders on mobile, tablet, and desktop viewports.
Responsive Web Design (RWD) is an approach to web development that makes web pages render well on a variety of devices and window or screen sizes. In today's digital landscape, users access websites from an enormous range of devices—from small-screen smartphones to ultra-wide 4K monitors. Our Responsive Website Viewer is a free developer tool that simulates these various viewports, allowing you to test how your layout, images, and navigation menus adapt to different resolutions without needing physical access to every device.
A non-responsive website can lead to a poor user experience, high bounce rates, and lower search engine rankings. This tool helps you solve several critical UI/UX challenges:
We have included the most common resolutions used in 2026 to ensure your testing is accurate:
| Category | Popular Devices |
|---|---|
| Mobile | iPhone 14/15 Pro, Galaxy S22/S23, Pixel 7/8 |
| Tablet | iPad Air, iPad Pro 11", iPad Pro 12.9", Galaxy Tab |
| Desktop | MacBook Air, 1080p Monitors, 2K/1440p Displays |
This tool uses an <iframe> to render the target website. Because of this, it is 100% client-side—no data about the websites you test is sent to our servers. However, please note that some modern websites use a security header called X-Frame-Options: DENY or SAMEORIGIN. This prevents their site from being embedded in other pages to protect against "clickjacking" attacks.
If a site refuses to load in the viewer, it is likely due to these security settings. This viewer is most effective for developers testing their own sites in a local or staging environment where such headers can be managed or for sites that allow cross-origin embedding.