Screen Resolution Checker
Check your screen resolution, viewport size, device pixel ratio, color depth, and display information instantly. Free online tool.
Scaled representation of your screen aspect ratio
What Is Screen Resolution?
Screen resolution is the number of pixels displayed on your screen, expressed as width × height (e.g., 1920 × 1080). Higher resolutions mean more pixels and sharper images. Common resolutions include 1366×768 (HD), 1920×1080 (Full HD), 2560×1440 (QHD), and 3840×2160 (4K UHD).
Screen Resolution vs Viewport Size
Screen resolution is your monitor's total pixel count. Viewport size is the visible area of your browser window — which is smaller because it excludes browser toolbars, scrollbars, and the taskbar. Web developers use viewport size for responsive design to ensure websites look good at any window size.
Device Pixel Ratio (DPR)
DPR is the ratio between physical pixels and CSS pixels. A DPR of 2 (common on Retina displays) means each CSS pixel is rendered using 4 physical pixels (2×2), resulting in sharper text and images. Designers need to provide 2x or 3x resolution assets for high-DPR displays.