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Screen Resolution Detector

Detect screen and viewport resolution with responsive breakpoint testing and real-time resize updates

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About This Tool

Screen Resolution Detector instantly displays your screen resolution, viewport size, device pixel ratio, available screen area, orientation, and responsive breakpoint — all updating in real time as you resize your browser window.

Key Features

Quick Preview

Use Cases

screen resolution viewport

Frequently Asked Questions

What information does the Screen Resolution Detector show?

The tool displays your screen resolution, viewport size, device pixel ratio, available screen area, current orientation (landscape or portrait), and the responsive breakpoint your viewport falls into.

What is the difference between screen resolution and viewport size?

Screen resolution is your monitor's physical pixel dimensions (e.g., 1920x1080). Viewport size is the visible browser window area, which is usually smaller than the full screen due to browser chrome, taskbars, and zoom settings.

What is device pixel ratio?

Device pixel ratio (DPR) is the ratio between physical screen pixels and CSS pixels. A DPR of 2 means each CSS pixel uses 2x2 physical pixels, common on Retina and high-DPI displays. This affects image rendering and responsive design.

How can I test responsive breakpoints?

The tool shows your current viewport width and height in real time. Resize your browser window to see how dimensions change. This helps identify which CSS breakpoints are active at different window sizes.

Does it detect screen orientation?

Yes. The tool shows whether your screen is in portrait or landscape orientation, which is particularly useful when testing responsive layouts on mobile devices or rotating monitors.

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