Screen & Browser Viewport Information
Inspect your display resolution, physical pixel multiplier, live viewport geometry, and color depth as reported directly by native W3C web APIs.
Understanding Device Pixel Ratio (DPR)
The Device Pixel Ratio (DPR) represents the ratio between physical display hardware pixels and CSS device-independent logical pixels. For example, an Apple MacBook Pro with a 2x Retina display renders 4 physical pixels (2×2 grid) for every 1 CSS logical pixel. A 4K monitor on Windows set to 150% scaling operates at a 1.5x DPR.
Screen Resolution vs. Viewport
While Screen Resolution reflects the global dimension of your physical desktop monitor, Browser Viewport measures only the interior pixel canvas available for websites. Resizing your browser window, opening developer tools, or adjusting operating system taskbars changes the viewport in real time.
Display Parameters FAQ
Why is my detected resolution different from my monitor box specs?
Modern operating systems (macOS Retina scaling or Windows Display Scaling at 125%, 150%, or 200%) report CSS logical pixels to web browsers to prevent UI elements from appearing microscopic. Multiply your screen resolution by the Device Pixel Ratio (DPR) shown above to calculate your physical pixel dimensions.
Can web browsers reveal exact monitor panel serial numbers?
No. For privacy and security reasons, modern web browsers do not expose EDID manufacturer data, panel serial numbers, or hardware model strings through public JavaScript APIs. ScreenCheck reports only safe, standard display metrics.