Screen Resolution
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Viewport Size
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Device Pixel Ratio
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Colour Depth
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Aspect Ratio
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Orientation
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Resolution Checker – Live Display Info

Instantly see your screen's real resolution, browser viewport size, device pixel ratio, colour depth, and aspect ratio — updates live as you resize the window or rotate your device.

Screen vs. Viewport

Screen resolution is your monitor's total pixel grid. Viewport size is how much of that space your browser window actually occupies — they're rarely the same number.

Device Pixel Ratio

A ratio above 1 means the display packs more physical pixels into each CSS pixel — common on Retina and high-DPI screens, and useful to know when exporting image assets.

Responsive Design Testing

Resize your browser window while this page is open to see exactly which breakpoint your viewport falls into — handy for debugging layout issues without opening dev tools.

Colour Depth

Colour depth reports how many bits your display uses per pixel. 24-bit is standard; 30-bit and above indicates a wide-gamut or HDR-capable panel.

FAQ

This tool reports your browser's rendered viewport and device pixel ratio, not always your monitor's native panel resolution — on high-DPI (Retina/4K) displays, the OS scales content so the effective resolution reported is often lower than the physical pixel count.
It's the ratio between physical screen pixels and CSS pixels. A ratio of 2 means your display packs four physical pixels into the space of one CSS pixel — common on Retina and many modern phone screens.
No — resolution and refresh rate are measured differently. Use our dedicated Refresh Rate Test to measure your display's actual Hz.
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