Screen Size Checker

Screen Size Checker is a free web utility for developers, designers, testers and everyday users that reports the display and browser measurements people often need to identify: current screen resolution, browser viewport, device pixel ratio and pixel density. Opening the site shows those values without an installation or an account. That helps when testing responsive layouts, preparing screenshots, diagnosing a display issue, picking a design breakpoint, or answering a support question about a device. The values separate physical screen dimensions from the usable page area, which explains why the same interface can render differently across devices, zoom settings, and high-density displays. Because the values are read from the active browser environment, you can resize the window or refresh and compare how the viewport changes. The interface keeps the current measurements easy to scan instead of sending you through browser settings or operating-system menus.