+ Free Tool

Mobile Responsiveness Tester

Preview how any URL renders across 9 device viewports — from iPhone SE to 4K desktops — and spot layout issues instantly.

Phones

Tablets

Desktops

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Enter a URL above and click Preview to see how it renders across device viewports.

Note: This tool simulates viewport dimensions only. It does not replicate actual device rendering engines, touch behavior, or network conditions. For true device testing, use BrowserStack or physical devices.

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