What is screen resolution?

Screen resolution is the number of pixels your display can show, expressed as width x height (e.g., 1920x1080). Higher resolution means more pixels and sharper images. A 1920x1080 (Full HD) screen has 2,073,600 pixels total. A 4K (3840x2160) screen has 8,294,400 pixels — four times as many.

What is the difference between screen resolution and viewport size?

Screen resolution is your monitor's total pixel count. Viewport size is the area inside your browser window (excluding toolbars, scrollbars, and OS chrome). The viewport is always smaller than or equal to the screen resolution. Web developers use viewport size for responsive design breakpoints.

What is device pixel ratio (DPR)?

Device pixel ratio is the number of physical pixels per CSS pixel. A DPR of 2 (common on Retina displays) means each CSS pixel maps to a 2x2 grid of physical pixels. A MacBook Pro with 2880x1800 screen and DPR 2 reports 1440x900 CSS pixels. Higher DPR means sharper text and images.

What is the most common screen resolution?

As of 2026, 1920x1080 (Full HD) remains the most common desktop resolution worldwide at roughly 22% of users. 2560x1440 (QHD) is growing among gamers and professionals. On mobile, 1080x2400 is the most common Android resolution. Apple devices use various Retina resolutions.

How does screen resolution affect web design?

Web designers use responsive breakpoints based on viewport width. Common breakpoints: 640px (mobile), 768px (tablet), 1024px (laptop), 1280px (desktop), 1536px (large desktop). CSS media queries test viewport width, not screen resolution. Device pixel ratio affects image sharpness — serve 2x images for Retina displays.

Color depth (bit depth) is the number of bits used to represent each pixel's color. 24-bit color (8 bits per channel) shows 16.7 million colors. 30-bit (10 bits per channel) shows 1.07 billion colors for professional color grading. Most consumer monitors use 24-bit color. HDR displays typically use 30-bit or higher.

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Screen Resolution Tester

Screen resolution is the number of pixels your display can render, expressed as width x height. Full HD is 1920x1080 (2.07 million pixels), 4K is 3840x2160 (8.29 million pixels). Device pixel ratio (DPR) indicates physical pixels per CSS pixel — a 2x Retina display renders 4 physical pixels per CSS pixel. Viewport size is the browser window area used for responsive web design breakpoints.

Instantly detect your screen resolution, browser viewport size, device pixel ratio, color depth, and orientation. Compare against common display resolutions including 4K, QHD, Full HD, and popular laptop and phone screens.

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Detecting your screen resolution...

How to Use

1
Open the tool
Your screen resolution, viewport size, device pixel ratio, color depth, and orientation are detected automatically when you open the page.
2
Check your resolution
The main display shows your screen resolution (e.g., 1920x1080) and browser viewport size. The viewport updates live as you resize your browser window.
3
Review display details
Check device pixel ratio (1x, 2x, 3x), effective resolution (screen x DPR), color depth (24-bit or 30-bit), and touch support.
4
Compare to common displays
Scroll to the comparison table to see how your resolution compares to Full HD, 4K, MacBook, iPad, and iPhone screens. Your matching resolution is highlighted.

Frequently Asked Questions

What is screen resolution?: Screen resolution is the number of pixels your display can show, expressed as width x height (e.g., 1920x1080). Higher resolution means more pixels and sharper images. A 1920x1080 (Full HD) screen has 2,073,600 pixels total. A 4K (3840x2160) screen has 8,294,400 pixels — four times as many.
What is the difference between screen resolution and viewport size?: Screen resolution is your monitor's total pixel count. Viewport size is the area inside your browser window (excluding toolbars, scrollbars, and OS chrome). The viewport is always smaller than or equal to the screen resolution. Web developers use viewport size for responsive design breakpoints.
What is device pixel ratio (DPR)?: Device pixel ratio is the number of physical pixels per CSS pixel. A DPR of 2 (common on Retina displays) means each CSS pixel maps to a 2x2 grid of physical pixels. A MacBook Pro with 2880x1800 screen and DPR 2 reports 1440x900 CSS pixels. Higher DPR means sharper text and images.
What is the most common screen resolution?: As of 2026, 1920x1080 (Full HD) remains the most common desktop resolution worldwide at roughly 22% of users. 2560x1440 (QHD) is growing among gamers and professionals. On mobile, 1080x2400 is the most common Android resolution. Apple devices use various Retina resolutions.
How does screen resolution affect web design?: Web designers use responsive breakpoints based on viewport width. Common breakpoints: 640px (mobile), 768px (tablet), 1024px (laptop), 1280px (desktop), 1536px (large desktop). CSS media queries test viewport width, not screen resolution. Device pixel ratio affects image sharpness — serve 2x images for Retina displays.
What is color depth?: Color depth (bit depth) is the number of bits used to represent each pixel's color. 24-bit color (8 bits per channel) shows 16.7 million colors. 30-bit (10 bits per channel) shows 1.07 billion colors for professional color grading. Most consumer monitors use 24-bit color. HDR displays typically use 30-bit or higher.

Screen Resolution Tester

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