Responsive Website Checker

Test how any website looks on different screen sizes and devices — desktop, laptop, tablet, and mobile. Preview your website's responsive design across 10+ device resolutions instantly, free online.

✓ 10+ Device Sizes✓ Live Preview✓ Mobile-First✓ Custom Size
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Enter a URL above and click "Preview Site" to see how it looks across devices.

Our free Responsive Website Checker lets you test any website across 8+ screen sizes and device types instantly. With Google's mobile-first indexing, ensuring your site looks and functions perfectly on every device is no longer optional — it directly impacts your search rankings.

Why Responsive Design Testing is Essential for SEO

In 2019, Google switched to mobile-first indexing — meaning Google primarily uses the mobile version of your website for indexing and ranking. By 2026, over 63% of all Google searches globally come from mobile devices. If your website doesn't render correctly on mobile, Google penalises your rankings regardless of how good your desktop experience is.

  • Mobile-First Indexing: Google ranks the mobile version of your site. A broken mobile layout = lower rankings.
  • Core Web Vitals: Google measures LCP, FID, and CLS separately for mobile and desktop. Mobile scores matter more.
  • User Experience: 57% of users won't recommend a business with a poor mobile website.
  • Bounce Rate: Non-responsive sites have significantly higher mobile bounce rates, which is a negative ranking signal.
  • Google Ads Quality Score: Mobile landing page experience directly impacts Google Ads Quality Score and CPC.

Common Responsive Design Issues to Check

  • Horizontal scrolling: Content wider than the viewport creates a bad mobile experience.
  • Text too small to read: Body text should be at least 16px on mobile.
  • Clickable elements too close: Touch targets should be at least 48×48 pixels apart.
  • Images not scaling: Use max-width: 100% for all images.
  • Navigation not mobile-friendly: Desktop menus often break on small screens.
  • Missing viewport meta tag: Without <meta name="viewport">, mobile browsers render at desktop width.
  • Fixed-width layouts: Any element with a fixed pixel width wider than the device will cause overflow.

Standard Device Screen Sizes for Testing

  • Desktop: 1280×800, 1366×768, 1920×1080
  • Laptop: 1024×768, 1280×800
  • iPad / Large Tablet: 820×1180, 768×1024
  • iPhone 14 Pro: 430×932 (393×852 logical pixels)
  • iPhone SE: 375×667
  • Android (Samsung Galaxy): 412×915, 360×800

Frequently Asked Questions

What is responsive web design? +
Responsive web design is an approach where a website's layout and content automatically adapts to the screen size and orientation of the device being used. This is achieved using CSS media queries, flexible grid layouts, and relative units (%, em, rem, vw, vh).
How does Google test mobile-friendliness? +
Google uses the Mobile Usability report in Google Search Console and the Mobile-Friendly Test tool to evaluate pages. It checks for: viewport configuration, text size, clickable element spacing, and content wider than the screen.
What is mobile-first indexing? +
Mobile-first indexing means Google predominantly uses the mobile version of your website's content for indexing and ranking. If your site has separate mobile and desktop versions, Google primarily evaluates the mobile version.
Why is my iframe preview not loading? +
Some websites block iframe embedding with X-Frame-Options: DENY headers for security reasons. If a site blocks previewing, use Chrome DevTools (F12 → Toggle Device Toolbar) or Google's Mobile-Friendly Test at search.google.com/test/mobile-friendly instead.

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