Screen Resolution Simulator – Test Any Website on 200+ Devices Free
About the Screen Resolution Simulator
The Screen Resolution Simulator lets you preview any live website at real device screen dimensions, from the latest iPhones and Galaxy phones to ultrawide monitors and 4K TVs. Enter a URL, pick a device preset or set a custom width and height, then zoom or rotate the viewport to check exactly how your layout responds.
This tool is built for developers, designers, and website owners who need to catch responsive design issues before they reach real visitors. Once you’ve confirmed how a page looks across devices, check its underlying markup with the HTML Beautifier or verify color contrast for accessibility with the Color Converter.
eToolsKit Team tested this tool across mobile, tablet, desktop, and TV device presets — loading a range of live sites at each resolution to confirm accurate viewport rendering and smooth zoom/rotate behavior.
How to Use the Screen Resolution Simulator
- Enter the Website URL you want to preview and click Load Website.
- Select a device from Mobile Phones, Tablets, Laptops & Desktops, or Smart TVs & Consoles to auto-fill dimensions.
- Or manually set a custom Width and Height in pixels.
- Adjust the Zoom Level slider or use a quick-zoom button (50%–200%) to fit the preview to your screen.
- Click Rotate to instantly swap width and height for landscape/portrait testing.
- Review the live Viewport Preview to check how your layout responds at that size.
Example Usage
Input: URL “https://example.com” with device preset “iPhone 15 Pro (393×852)” selected.
Output: The website loads inside a viewport sized exactly 393x852px, showing precisely how the layout, navigation, and text wrap on that specific iPhone model — without needing physical access to the device.
Switching the device dropdown to “Desktop 1920×1080 (FHD)” instantly reloads the same page at that resolution for side-by-side comparison.
Frequently Asked Questions
Some websites use the X-Frame-Options header or Content Security Policy to block embedding in iframes, which prevents them from loading inside this simulator. This is a restriction set by the target site, not an issue with the tool.
It simulates the viewport dimensions (width and height in pixels) of each device, which determines how responsive layouts render. It does not emulate device-specific browser engines or hardware performance.
Yes, manually enter any Width and Height value between 100px and 7680x4320px in the Controls section instead of selecting a preset.
Zoom scales the preview viewport up or down so you can see very large or very small device dimensions without excessive scrolling.
Yes, this tool is completely free with no signup required.
