Quick screen-resolution check
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Full screen (pixels)
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Used by browser to draw content [viewport] (pixels)
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Device-pixel-ratio
Share this page with anyone and their exact screen size appears instantly.
No installs; works on phones, tablets, and multi-monitor desktop setups.
Screen resolution refers to the number of pixels a display can show, measured as width x height (e.g., 1920x1080, known as Full HD). Each pixel is a tiny dot of color, and higher resolutions pack more of those tiny dots (pixels) for sharper images. For example, a 1920x1080 screen has over 2 million pixels, while a 4K screen (3840x2160) has over 8 million.
Resolution is key for web developers, UI designers, and gamers. Developers use tools like DisplayPixels to test layouts across devices, from smartphones (e.g., 375x667) to 4K monitors. Designers rely on high resolutions for crisp visuals, while gamers choose resolutions like 1440p for a balance of detail and performance. Device Pixel Ratio (DPR) also matters—it's the ratio of physical pixels to CSS pixels, affecting clarity on high-DPI screens like Retina displays.
| Resolution | Pixel Count | Use Cases |
|---|---|---|
| 1280x720 (720p) | 921,600 | Budget laptops, streaming |
| 1920x1080 (1080p) | 2,073,600 | Standard monitors, TVs |
| 2560x1440 (1440p) | 3,686,400 | Gaming, productivity |
| 3840x2160 (4K) | 8,294,400 | Design, premium gaming |
Explore more in my detailed resolution guide.