Responsive Mockup Viewer
Preview any website across different devices and screen sizes
How to Use
Website Preview
- Paste a URL in the Website URL tab
- Click "Load Website"
- Choose a device preset to see how it looks
- Use the Rotate button to toggle portrait/landscape
Custom HTML
- Switch to the Custom HTML tab
- Paste your HTML code
- Click "Load HTML"
- Test across different devices and orientations
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How to Use the Responsive Mockup Viewer
Enter any website URL in the input field and click preview. The tool loads the page inside responsive frames showing how it appears on desktop, tablet, and mobile screen sizes simultaneously.
Switch between preset device sizes — iPhone, iPad, common Android phones, laptop screens — or enter custom dimensions to test specific breakpoints. Rotate between portrait and landscape orientations with one click.
Use this tool during development to verify that your responsive design adapts correctly across screen sizes before deploying to production.
Why Use This Tool
Responsive design testing usually requires either physical devices, browser developer tools with manual resizing, or paid testing platforms. This tool gives you an instant multi-device preview from any browser, making it the fastest way to check how a page looks across screen sizes.
It is especially valuable for designers presenting responsive layouts to clients, developers testing CSS breakpoints, and QA teams verifying cross-device compatibility.
Key Features
- Simultaneous preview at multiple screen sizes
- Preset device dimensions for popular phones and tablets
- Custom width and height input for specific breakpoints
- Portrait and landscape orientation toggle
- Works with any publicly accessible URL
- No installation or browser extension required
Frequently Asked Questions
Can I test localhost or private URLs?
The tool loads URLs in an iframe, so it can only access publicly available websites. Local development servers and URLs behind authentication cannot be loaded due to browser security restrictions.
How accurate is this compared to real devices?
The viewer accurately simulates screen dimensions and viewport sizes. However, actual device rendering may differ slightly due to browser engine differences, pixel density, and touch-specific behaviors. For final testing, always verify on real devices.
What screen sizes are included?
Preset sizes include iPhone SE, iPhone 14 Pro, Samsung Galaxy S23, iPad Mini, iPad Pro, and common laptop widths (1280px, 1440px, 1920px). You can also enter any custom dimensions.
Does this test touch interactions?
The viewer shows visual layout at different sizes but does not simulate touch events, hover states that differ on mobile, or mobile-specific browser behaviors like address bar resizing.