Check your display resolution, pixel density, color depth, and compare with common resolutions
Frequently Asked Questions
What is screen resolution?
Screen resolution is the number of pixels displayed on a screen, expressed as width × height (e.g., 1920×1080). More pixels mean sharper images.
What is the difference between DPI and PPI?
DPI (Dots Per Inch) and PPI (Pixels Per Inch) are often used interchangeably for screens. PPI is technically more accurate for digital displays, while DPI refers to print output.
What is device pixel ratio?
Device pixel ratio (DPR) is the ratio between physical pixels and CSS pixels. A DPR of 2 means the screen has 2×2 physical pixels for each CSS pixel (e.g., Retina displays).
Why is my screen resolution different from viewport size?
Screen resolution is the total pixels of the display, while viewport size is the browser's content area. Browser toolbars, taskbars, and scaling affect the viewport.
What is the most common screen resolution?
As of 2024, 1920×1080 (Full HD) is the most common desktop resolution. 1366×768 is second. On mobile, 390×844 (iPhone) and various Android resolutions dominate.
How do I calculate PPI?
PPI = √(width² + height²) / diagonal_size_inches. For example, a 5.5" 1920×1080 screen: √(1920²+1080²)/5.5 = 401 PPI.
What is 4K resolution?
4K typically refers to 3840×2160 (4× Full HD). True 4K cinema is 4096×2160. It offers roughly 8.3 million pixels for ultra-sharp imagery.
Does higher resolution always mean better?
Not necessarily. On small screens, higher resolution above retina level has diminishing returns. It also requires more GPU power. The optimal resolution balances sharpness with performance.