What Is My Viewport?

Instantly detect your current viewport width & height.

Viewport (CSS pixels)

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DPR: — • Zoom: —

Viewport (CSS)

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Viewport (physical)

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Screen pixels

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Orientation

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Viewport = visible area of the web page in CSS pixels. Physical viewport = CSS viewport × DPR. If zoomed, DPR and viewport values change.

Browser Viewport

Your viewport is the visible area of a webpage inside your browser window. Unlike screen resolution, which measures the full pixel dimensions of your device’s display, the viewport measures only the space available for web content after subtracting browser toolbars, tabs, address bar, and system UI elements. It represents the actual width and height your device gives to a webpage.

Why Viewport Matters

A well-defined viewport is essential for responsive design, ensuring websites adjust smoothly across desktops, tablets, and mobile phones. Search engines like Google prioritize websites that display correctly at all viewport sizes, making viewport accuracy a direct factor in better user experience, lower bounce rates, and improved SEO performance. Your viewport dimensions help developers optimize layout, text scaling, UI scaling, and performance for your specific device.