Test your website across different device sizes and screen resolutions
Test how your website appears on various devices without needing physical access to each one. The tool provides simulated device frames with accurate dimensions for popular phones, tablets, and desktops.
The Responsive Tester tool allows you to preview how your website appears on various devices and screen sizes. It's essential for ensuring your responsive design works correctly across the full spectrum of devices your users might use.
The tool includes a comprehensive library of device presets organized by category. Each preset uses real-world device dimensions to provide accurate previews.
375 × 667 pixels
390 × 844 pixels
428 × 926 pixels
360 × 800 pixels
393 × 851 pixels
768 × 1024 pixels
820 × 1180 pixels
834 × 1194 pixels
1024 × 1366 pixels
1280 × 800 pixels
1440 × 900 pixels
1920 × 1080 pixels
2560 × 1440 pixels
3840 × 2160 pixels
Need a specific dimension that isn't in the preset list? Enable Custom Size mode to set your own width and height values.
Tip: Custom sizes are perfect for testing specific breakpoint widths like 768px (tablet), 1024px (small desktop), or any custom design requirement.
Fine-tune your preview experience with these display options.
Adjust zoom from 10% to 200% using the slider or zoom buttons. Quick buttons provide instant access to 50% and 100% zoom levels.
Switch between portrait and landscape orientation. Useful for testing how your layouts adapt to different screen orientations.
Toggle the device frame on or off. When enabled, shows a realistic device frame with speaker grills for a more authentic preview.
Enable optional rulers to see pixel measurements along the width and height of your preview. Perfect for precise dimension reference.
Enter fullscreen mode for an immersive preview experience. The control panel is hidden, allowing you to focus solely on how your website appears.
Note: Some websites may not load due to CORS restrictions or X-Frame-Options headers. Try a different website to verify the tool is working correctly.
Use the device presets to test your website's responsive breakpoints. Start with mobile devices to verify mobile-first design, progress through tablet sizes, and end with desktop sizes.
Test specific viewport widths that match your design requirements. Enable Custom Size mode and set the exact dimensions you need.
Test landscape orientations for mobile and tablet devices. Verify that your layouts adapt correctly when users rotate their devices.
Test how your site looks on 4K displays and other high-resolution monitors. Ensure images and text remain crisp and readable.
Use zoom to fit larger devices on smaller screens. A 1920×1080 desktop preview can be zoomed to 50% to fit on most laptop screens while maintaining the correct aspect ratio.
For advanced testing, combine the Responsive Tester with browser developer tools. Use DevTools for network inspection and console debugging while testing different viewports.
Always test both portrait and landscape orientations for mobile and tablet devices. Some layouts work great in one orientation but fail in the other.
Toggle the device frame off when taking screenshots for documentation or presentations. Use the ruler to show precise dimensions in your screenshots.