The screen resolution result uses the width and height your browser reports in CSS pixels. It may differ from your display’s native pixel resolution because of system scaling. To confirm the panel’s native resolution, check your device specifications or display settings.
What Is My Screen Size? Check Your Browser Dimensions
Viewport (CSS px)
Screen Resolution Test and Screen Size Checker
The large number above is your browser viewport: the space available for the page layout, in CSS pixels. The screen resolution line reports the full screen in CSS pixels, which may differ from the panel’s native resolution. DPR describes pixel scaling, not physical size in inches. For a reference, compare common screen resolution sizes across devices.
Need the size in inches? Learn how to measure a laptop screen. For pixel dimensions such as 1920 × 1080 or 3840 × 2160, use the screen resolution chart.
How detection works: browser screen dimensions, viewport width and device pixel ratio.
Device Information
Display Properties
Aspect Ratio
Device Pixel Ratio (DPR)
Color Depth
System & Browser
Operating System
Browser
Advanced Information
Cookies Enabled
Touch Support
User Agent
Related Resources
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Frequently Asked Questions
Screen size here is the full display size reported by the browser in CSS pixels. Viewport size is the current page layout area, also in CSS pixels. Resize the browser window to see the viewport change. Neither value is a measurement in inches or centimeters.
Device pixel ratio (DPR) is the ratio of physical pixels to CSS pixels. A DPR of 2 means two physical pixels per CSS pixel along each dimension. Browser page zoom can change DPR. It is not PPI and cannot tell you the screen’s physical size in inches.
Understanding screen sizes, resolutions, and DPR helps developers create responsive websites that look great on all devices. It's essential for optimizing user experience across different screens.
Measure diagonally across the visible display, from one corner to the opposite corner, excluding the bezel. Divide centimeters by 2.54 to get inches. You can also check the exact model’s specifications. This browser tool cannot reliably detect the physical diagonal or PPI automatically.