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Screen Resolution Simulator
Test how your website displays on mobile, tablet and desktop without switching devices.
Test your site at any resolution
How does your site look on an iPhone 15? On a Samsung tablet? On a 4K screen? Our simulator displays any web page at the resolution of your choice — perfect for testing responsive design.
How to use it
- Enter your site URL
- Select a preset resolution or enter custom dimensions
- Preview your site in a frame at the chosen resolution
Why test resolutions
- Responsive design — verify your site adapts to every screen size
- Visual bug detection — overflowing menus, truncated text, off-frame images
- Mobile-first — Google indexes the mobile version first. Broken mobile = hurt SEO
See also: Screen Resolution, Page Size Checker.
FAQ
Is the simulator as reliable as a real device?
Very close but not identical. It resizes the viewport to show CSS rendering, but touch behaviors, pixel density and rendering performance only match on real devices. For quick tests, the simulator is perfect. For final testing, use a real device.
