Test Responsive Design Across All Devices

Responsive design is crucial — over 60% of web traffic comes from mobile devices. Our free responsive checker takes real browser screenshots at Desktop (1920×1080), Tablet (768×1024), and Mobile (375×812) viewports so you can see exactly how your site renders on each device.

🖥️ Real Browser Rendering

Uses headless Chromium for pixel-perfect screenshots — not emulated previews or iframes.

📱 Three Viewports

Desktop, Tablet, and Mobile captures shown side by side for easy comparison.

⚡ Simultaneous Capture

All three screenshots are captured in parallel for the fastest results.

📥 Download Each

Download individual screenshots for each device to share with your team.

Frequently Asked Questions

What viewports does this test?

Desktop (1920×1080), Tablet (768×1024), and Mobile (375×812) — the most common breakpoints.

Are these real browser screenshots?

Yes! We use headless Chromium to render the page at each viewport size, producing real screenshots — not CSS-resized iframes.

Is this tool free?

Completely free. For API access and higher volume, sign up for a free account with 200 screenshots/month.

Can I test custom viewport sizes?

This tool tests the three most common sizes. For custom viewports, use the Screenshot Tool or the SnapAPI API directly.

Free Responsive Design Checker