MagicKit.ai

Screen Size Tester

Test responsive designs at different screen sizes. Preview how sites look on various devices.

How to Test Screen Sizes

  1. 1 Enter a URL to test or use the current window
  2. 2 Click 'Load' to display the website
  3. 3 Select a device preset (mobile, tablet, laptop, desktop)
  4. 4 Or manually enter custom width and height dimensions
  5. 5 View how your site responds at different screen sizes

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Last updated: January 15, 2026 · v2.1