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Responsive Preview Tool

Preview any website at different screen sizes. Test responsive design across mobile, tablet, and desktop viewports.

Testing responsive design across devices is essential for modern web development. This tool lets you preview any website in an iframe at common viewport sizes — mobile, tablet, and desktop — without needing multiple devices.

Note: Some websites block iframe embedding via X-Frame-Options or Content-Security-Policy headers. If a site doesn't load in the preview, it has blocked embedding. Everything runs in your browser.

Preview

Results

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How to Use

  1. Enter the website URL to preview
  2. Select the viewport size
  3. Click Calculate to load the preview
  4. Note: Some sites block iframe embedding

FAQ

Why doesn't the preview load for some sites?

Many websites set X-Frame-Options: DENY or Content-Security-Policy frame-ancestors to prevent embedding in iframes. This is a security feature.

Is this the same as browser DevTools?

Browser DevTools provides more accurate responsive testing with device emulation, touch simulation, and network throttling. This tool offers a quick visual check.

Is my data safe when I use Responsive Preview Tool?

Yes. All calculations run entirely in your browser. Your data is never sent to a server, stored in a database, or shared with anyone. You can use this tool with complete confidence that your information remains private.

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Learn More

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