My Screen Size

Screen resolution describes the width and height reported for the display that contains the center of the browser window. Viewport size describes the part of the browser currently available to the webpage. Browser tabs, toolbars, side panels, window borders, and a non-maximized window can make the viewport much smaller than the screen.

Responsive websites react mainly to the viewport, not the full screen. If you are testing a layout breakpoint, use the live browser viewport value. If you are checking the display space reported to the browser, use screen resolution.

Available screen area is the space the operating system reports as available to normal windows after permanent or semi-permanent interface areas are excluded. On desktop systems, a taskbar or dock can reduce the available height or width.

A full-screen browser can still behave differently from a maximized window, and operating systems do not all report reserved areas identically. Treat available screen as planning information rather than a promise that every pixel can be occupied.

Web layouts use CSS pixels. A CSS pixel is a logical measurement and does not always map to one hardware pixel. Device pixel ratio, usually shortened to DPR, describes the ratio between device pixels and CSS pixels reported for the current display context.

This tool multiplies the browser-reported CSS screen dimensions by DPR to show an estimated device-pixel size. That calculation is useful for understanding high-density displays and image rendering, but browser zoom, operating-system scaling, and privacy behavior mean it is not proof of the panel's native hardware resolution.

A browser is designed to lay out webpages, not inventory monitor hardware. It can expose logical dimensions, color-depth values, orientation information, and touch capability, but it does not reliably reveal the panel manufacturer, model, physical diagonal, panel technology, or exact refresh rate.

On a multi-monitor system, the browser generally reports the screen containing the center of the current window. Moving a window between displays can therefore change screen dimensions or DPR. Browser privacy protections may also reduce or standardize information to limit device fingerprinting.

Color depth and pixel depth are browser-reported bit-depth values. Modern browsers commonly report 24 bits, but the value does not certify the panel's color gamut, HDR performance, calibration, or the number of colors visible under current hardware and operating-system settings.

Touch support is inferred from the maximum touch points and coarse-pointer information exposed by the browser. It can show that touch input is available, but it cannot prove that the current display panel itself is touch-sensitive because a device may have another touch input surface.

The page reads standard browser properties after it loads. It does not request camera, location, screen-capture, or window-management permission, and it does not contact an external lookup service.

The displayed report is built locally. Selecting the copy button places the visible text on your clipboard only when the browser permits clipboard access.