What Is My Screen Resolution? - Detect Display Size & Pixel Ratio

Your Display Info

Screen Resolution

Window Size

Device Pixel Ratio

Aspect Ratio

Color Depth

Orientation

Common Screen Resolutions

Resolution	Name	Aspect Ratio	Usage
1920x1080	Full HD	16:9	Most popular desktop
2560x1440	QHD / 2K	16:9	Gaming monitors
3840x2160	4K UHD	16:9	High-end displays
1366x768	HD	16:9	Budget laptops
1536x864	HD+	16:9	Scaled laptops
2560x1600	WQXGA	16:10	MacBook Pro
1440x900	WXGA+	16:10	Older MacBooks
375x812	iPhone X/11/12	19.5:9	Mobile
412x915	Android HD	20:9	Popular Android

Why Does Screen Resolution Matter?

Screen resolution determines the sharpness and detail of everything displayed on your screen. A higher resolution means more pixels are packed into the display, resulting in crisper text, sharper images, and more screen real estate for multitasking.

For Web Developers

Knowing your visitors' screen resolution helps you design responsive layouts. Most web traffic now comes from mobile devices with resolutions like 375x812 (iPhone) or 412x915 (Android). Testing at these resolutions is essential for a good user experience.

For Gamers

Resolution directly impacts gaming performance. Higher resolutions like 4K (3840x2160) require significantly more GPU power than 1080p. Many gamers choose 1440p as a sweet spot between visual quality and frame rate. Your monitor's native resolution is always the best choice for image quality.

Device Pixel Ratio (DPR)

The device pixel ratio indicates how many physical pixels correspond to one CSS pixel. A DPR of 2 (common on Retina displays) means each CSS pixel is rendered using 2x2 physical pixels, making text and images look sharper. Modern smartphones often have DPR values of 2-3.

How to Change Your Screen Resolution

Windows: Right-click desktop, Display Settings, Display Resolution dropdown
Mac: System Settings, Displays, choose a resolution or use Scaled
Linux: Settings, Displays, Resolution, or use xrandr in terminal
Chromebook: Settings, Device, Displays, Display size slider

Choosing the Right Resolution

For general use, 1920x1080 (Full HD) is the most popular and widely supported resolution. For creative professionals who need more workspace, 2560x1440 (QHD) or 3840x2160 (4K) displays offer significantly more screen real estate. Keep in mind that higher resolutions on smaller screens may make text too small to read comfortably without scaling.

FAQ

What is the most common screen resolution?

1920x1080 (Full HD) is the most widely used screen resolution globally, used by about 23% of all users according to StatCounter.

Why does my resolution look different from my screen specs?

This is usually due to display scaling. Windows and Mac often scale content to 125% or 150%, which changes the effective CSS resolution reported by browsers.

What is device pixel ratio?

Device Pixel Ratio (DPR) is the ratio between physical pixels and CSS pixels. A DPR of 2 means 4 physical pixels for each CSS pixel (2 wide x 2 tall), common on Retina/HiDPI displays.