Everything your browser can tell about your display — resolution, refresh rate, pixel density and color — detected the moment the page loads. Nothing to install, and nothing leaves your device.
Your screen resolution is
The space a website actually gets inside your browser window — updates live as you resize.
Updates the moment you rotate your device.
Open this page and the numbers above are already yours — the browser reads them straight from your display, with no permission prompts and nothing sent anywhere. Here is what each of them means.
Resolution is the number of tiny dots — pixels — your display lights up to draw the picture: 1920 × 1080 is Full HD, 3840 × 2160 is 4K. Because your system scales everything up to keep text readable, the browser often works with a smaller number; this page multiplies it back to show the panel's true figure. If it still looks lower than the box promised, display scaling or browser zoom is almost always the reason.
Pixel density is how many of the screen's real pixels are used to draw each dot of the picture. A value of 2× or higher is what Apple calls Retina and everyone else calls HiDPI — text looks noticeably sharper. In-between values like 1.25× or 1.5× usually come from display scaling in Windows, which makes everything comfortably bigger. It is also the reason a 4K laptop can honestly report a resolution of 1920 × 1080.
The viewport is the part of the browser window a web page can actually draw into — the screen minus toolbars, taskbars and any neighboring windows. Web developers design against this figure rather than the screen itself, which is why it updates live as you resize the window.
Refresh rate is how many times per second the display redraws, measured in hertz. 60 Hz is the long-standing standard, while 120 Hz and above makes scrolling and games visibly smoother. The figure above is a quick estimate from animation timing; the dedicated refresh rate test measures it precisely and can catch a high-refresh panel being held at 60 Hz.
Color depth is the number of bits used per pixel — 24-bit means about 16.7 million colors, and 30-bit panels step up to over a billion for smoother gradients. The gamut is the range of colors the display can show: sRGB is the web's baseline, while Display P3 or Rec. 2020 mean a wide-gamut screen. HDR support is detected separately and unlocks brighter highlights in supported videos and games.
Orientation is simply whether the screen is currently wider than it is tall. On phones and tablets it flips live as you rotate the device; on a desktop it changes when a monitor is set to portrait in the display settings — a favorite of programmers and anyone who reads long documents.
The browser reports whether your screen accepts touch and how many fingers it can track at once — most touchscreens handle ten. A report of zero on a touch laptop usually means the digitizer's driver is disabled or the browser is ignoring it.