Screen Resolution
Your screen's physical resolution, CSS resolution, pixel ratio, viewport, color depth, and orientation, read live from the browser.
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Frequently Asked Questions
Why is the physical resolution different from the CSS resolution?
Operating systems scale the interface on high-density screens so text stays readable. A 2560×1600 MacBook display at 2× scaling tells web pages it's 1280×800 CSS pixels; the panel still has all 2560×1600 physical pixels. Both numbers are correct -- they answer different questions.
Which number do I use when buying a wallpaper or setting a game resolution?
The physical one. Games and wallpapers address the real pixels of the panel, not the scaled layout size.
Why does the viewport change when I resize the window?
The viewport is just the inside of your browser window, which is what a website has to fit into. Screen and physical resolution don't change; the viewport does.