🖥️Screen Resolution Detector

Detect your screen resolution, viewport size, and device pixel ratio.

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About Screen Resolution Detector

Screen Resolution Detector instantly displays your monitor's physical resolution, current browser viewport dimensions, device pixel ratio, and color depth. It's an essential quick reference for developers, designers, and QA testers verifying responsive layouts across different screen sizes.

How to Use Screen Resolution Detector

1
Open the tool on your target device
Navigate to the Screen Resolution Detector on the device whose display information you want to check.
2
View your display metrics
Your screen resolution, viewport size, device pixel ratio, and color depth are displayed immediately without any interaction required.
3
Resize to test responsive breakpoints
Resize your browser window and watch the viewport dimensions update in real time to test different responsive layout breakpoints.

Common Use Cases

Developers checking viewport dimensions at different responsive breakpoints
Designers verifying how their layout appears at specific screen sizes
QA testers documenting screen specifications for bug reports
Content creators optimizing images and graphics for target display resolutions

Frequently Asked Questions

What is the difference between screen resolution and viewport size?

Screen resolution is the total pixel count of your physical display (e.g., 1920×1080), while viewport size is the actual area your browser window uses for rendering web content, which changes as you resize the browser.

What is device pixel ratio (DPR)?

Device pixel ratio is the ratio of physical screen pixels to CSS pixels. Retina and HiDPI displays have a DPR of 2 or higher, meaning two physical pixels map to every one CSS pixel, resulting in sharper visuals.

Does this tool detect mobile screen sizes?

Yes — open the tool on any device including phones and tablets and it displays that device's screen resolution and viewport dimensions instantly.