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Responsive Layout Preview
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Responsive Layout Preview

Preview your site at multiple screen sizes — iPhone, iPad, laptop, and desktop. Free responsive layout preview inside a scaled iframe.

Works Offline100% Free

Processed 100% locally in your browserPrivate & Safe

Responsive Layout Preview runs entirely on your device using Web API standards. No data is ever uploaded to UtilixVerse servers.

Your Input
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Browser
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Result
No Server UploadsNo Account RequiredWorks OfflineZero Data Logging
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393 × 852pxOpen in new tab ↗

Note: some sites refuse to load inside an iframe (X-Frame-Options / CSP frame-ancestors). Use your own site, localhost, or HTML mode for those.

Responsive Layout Preview — Test Your Site at Multiple Screen Sizes

Preview your site at multiple screen sizes with the UtilixVerse responsive tester. Load any URL — or paste your own HTML — and instantly switch between iPhone, iPad, laptop, and desktop viewports, including exact device dimensions. Catch broken breakpoints, overflowing navbars, and cramped layouts before your users do, all without leaving the browser.

Test like a QA team, solo

Jump between nine device presets covering phones (iPhone SE to Galaxy S21), tablets (iPad Mini and iPad Pro), laptops, and wide desktops. Need something bespoke? Type custom dimensions, rotate to landscape, and zoom to inspect pixel-level detail. The HTML mode even previews markup that is not deployed anywhere yet.

Free, offline, and private. Explore the fullDesigner collection for more layout and style tools.

Responsive Layout Preview FAQ

Common questions about previewing layouts at multiple screen sizes.

How do I preview a website at different screen sizes?

Enter the website URL and pick a device preset (iPhone, iPad, laptop, desktop) or type custom width and height values. The page loads inside a scaled frame, and the zoom slider lets you inspect details. You can also rotate between portrait and landscape and reload the frame at any time.

Why do some websites not load in the preview?

Many sites send X-Frame-Options or Content-Security-Policy frame-ancestors headers that refuse to render inside iframes — a security feature you cannot bypass. For those sites, use "Paste HTML" mode to preview a copy of the markup, or preview your own site and localhost pages, which typically allow framing.

What is the "Paste HTML" mode for?

It renders your own HTML markup inside the frame instead of a live URL. This is perfect for previewing components, email templates, and static pages during development — no server needed. The built-in responsive demo shows a grid layout that adapts at the 640px breakpoint.

How accurate are the device presets?

The presets use the exact viewport sizes (in CSS pixels) of popular devices, so layouts respond to breakpoints exactly as they would on real hardware. The scaled frame fits the preview into your screen while preserving the simulated device width.

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