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Common questions
Why does my display scaling show more than 100%?
HiDPI screens (Retina, most phones and tablets) pack more physical pixels per interface point so that elements look sharp at high density. A scaling of 200% means 4 physical pixels (2×2) map to each interface point, producing a crisper image — but the system reports twice the scaling of a standard display.
What is the difference between screen size and window size?
Screen size (screen.width / screen.height) is your monitor's logical resolution after OS scaling. Window size (window.innerWidth / innerHeight) is the usable viewport inside the browser — excluding the address bar, tab strip, and OS chrome. They differ whenever the window is not full-screen.
Can these values be spoofed?
Yes. User-Agent strings can be overridden in browser settings or extensions. Screen metrics can be faked via DevTools device emulation. The values on this page reflect what the browser reports — not necessarily the physical hardware behind it.