Responsive Design Tester

Test layouts at different breakpoints with common device sizes and custom viewports

Overview

The Responsive Design Tester allows you to test how websites and web applications look across different screen sizes and devices. Preview any URL or custom HTML at common device dimensions including phones, tablets, and desktops, test custom viewport sizes, and ensure your designs work seamlessly across all breakpoints.

Tips

  1. Test Common Breakpoints: Start with the device presets for iPhone (390px), iPad (768px), and desktop (1920px) to cover the most common screen sizes, then test custom dimensions at your specific breakpoint values like 768px and 769px.

  2. Test Both Orientations: Don’t forget to toggle between portrait and landscape modes, especially for tablets. Many users browse in landscape, and layouts can behave differently with swapped width and height values.

  3. Test URLs and Custom HTML: Use the URL input to test your live websites, or paste custom HTML/CSS to prototype new responsive designs before implementing them in your codebase.

  4. Check Edge Cases: Test viewport widths just above and below your media query breakpoints (like 767px and 768px) to ensure smooth transitions and catch any layout issues at the boundaries.

  5. Start Mobile-First: Begin testing with the smallest screen size (iPhone SE at 320px) to ensure your content works on minimal viewports, then progressively test larger sizes to verify your responsive enhancements work correctly.