What is my screen resolution?

Your screen resolution is the number of pixels across and down your display. Websites see it in "CSS pixels", which can be smaller than the number on your device's spec sheet. The actual pixel count is that figure multiplied by your pixel ratio.

Why is my resolution lower than advertised?

Phones, tablets, and many laptops have very dense screens. To keep text a readable size, they group several physical pixels into one CSS pixel. A pixel ratio of 2 means each CSS pixel is 2 × 2 physical pixels. Display scaling in Windows or macOS works the same way: at 150% scaling, a 2560 × 1440 display reports 1707 × 960.

What's the browser window size?

It's the area inside your browser where pages are drawn, excluding toolbars and tabs. Web designers use it to decide which layout to show, which is why a page can look different when you resize the window. Try resizing now and watch the numbers above change.

How to change your resolution

• Windows: Settings > System > Display, then choose a display resolution and scale.
• Mac: System Settings > Displays, then choose a size option.
• Phones and tablets: resolution is fixed, but you can change text or display size in Settings under Display.