Responsive Website Tester - Check Any Site on Mobile, Tablet & Desktop | Glassever

Responsive Website Tester

Preview any website on phones, tablets, laptops and desktops. Pick a device, enter a custom size, or drag to resize and see how your layout reacts.


Devices to compare

390 × 844 Bootstrap: xs Scale 100% iPhone 14 Tip: drag the right / bottom edge of the device to resize
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Enter a URL to begin

Type your website address above and press Test Site.

Page not loading or showing blank? Some websites (banks, Google, Facebook and others) forbid being displayed inside frames using X-Frame-Options or Content-Security-Policy: frame-ancestors. This is a browser security rule and not a problem with your layout. Your own site can be tested if it allows framing, or open it in a new tab and use browser DevTools. Also note that http:// pages cannot load inside this https:// page.

Why test responsiveness?

Mobile-first traffic

Most visitors browse on phones. Verify navigation, buttons and text are comfortable at 320–430px widths.

Catch breakpoint bugs

Drag the edge to find the exact width where your layout breaks, then compare it with the Bootstrap breakpoint badge.

Compare side by side

Turn on multi-device mode to see phone, tablet and desktop renders at the same time.