WebsiteGeek | Responsive Website Tester
Preview and test how websites appear across devices
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WebsiteGeek | Responsive Website Tester - Preview and test how websites appear across devices

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Test site layout styling with our free responsive website tester tool. Check mobile views, laptop screens, and custom display resolutions online. The tool works online and is available on Windows, macOS, Linux, ChromeOS, and mobile devices through any modern web browser.

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👋 Thanks for checking out Responsive Website Tester! I built this tool to make it super simple to preview how any website looks across different devices and screen sizes—without needing plugins, installs, or multiple physical devices. It’s lightweight, browser‑based, and designed for developers, designers, and marketers who want quick, accurate responsive checks.

handy little tool, threw my portfolio in there and caught a weird padding glitch on the tablet view i never noticed before. would be nice to save custom resolutions but solid for a quick check.

Would love to see a side-by-side comparison mode where I can view two different breakpoints at once, like mobile and desktop, so I can quickly spot layout shifts without toggling back and forth.

It would be super helpful if you could add a side-by-side comparison view so I can see how a layout looks on mobile and desktop at the same time, that would save me a ton of back and forth when checking responsive breakpoints.