Screen Resolution Lookup
Values refresh live when you resize the window or rotate the device. Everything is read from your own browser on this page; nothing is collected or sent anywhere.
How it works
仕組みOne glance at everything your browser knows about this display: screen resolution in CSS pixels, the area left after taskbars and docks, an estimate of the native physical resolution, the current viewport, device pixel ratio, colour depth, and orientation. The plates update live as you resize the window or rotate the device, and a copy button produces a plain-text report you can paste into a bug ticket or support thread. These values are different on every machine and change with every settings tweak, which is exactly why a lookup page on someone else’s server can’t answer them, but your own browser can.
Browsers measure the screen in CSS pixels after OS scaling, so a 4K panel at 200% scale reports 1920×1080. Multiplying by the device pixel ratio usually recovers the native 3840×2160, but fractional scaling like 125% can round a few pixels off. When the estimate looks slightly odd, trust the panel’s spec sheet.
Nearly every browser reports 24-bit (8 bits per channel) regardless of the panel, because that is the depth of the standard rendering pipeline, not the hardware. Wide-gamut and HDR support are exposed through separate CSS media queries, so this number staying at 24 is normal and not a defect.
Screen metrics are one small ingredient in browser fingerprinting: combined with fonts, GPU strings, and timezone they help distinguish visitors. Individually they are weak signals shared by millions of identical laptops. This page only displays them to you locally; nothing is logged or transmitted anywhere.