Responsive Design Tester
Enter a URL and preview the site in different screen sizes (mobile/tablet/desktop).
Responsive Tester
Preview any URL at different viewport sizes
Website URL
Device presets
Preview
Ready to test
Enter a URL and click “Load” to preview in different sizes.
Viewport
1280 × 720
Why Use the Responsive Tester?
Check how your site looks on phones, tablets, and desktops
Multiple viewports
iPhone, iPad, tablet, desktop presets.
Instant switch
Change device size without reloading.
Proxy preview
Preview via proxy to avoid iframe blocks.