UsefulTab
Display Resolution
See your screen resolution, window size, and pixel ratio.
Check your display resolution
This tool reports everything your browser knows about your display. Screen resolution is the full pixel size of your monitor; the available area excludes system bars like the taskbar or dock. The window and viewport sizes are the browser's outer size and the inner area a web page can actually use — useful when checking a responsive layout. Device pixel ratio tells you how many physical pixels make up one CSS pixel: 2 or 3 on high-DPI "Retina" displays, 1 on standard ones, which is why a page can look sharp at a resolution that seems small. It also shows color depth and orientation, and every value updates live as you resize the window, zoom, or rotate the device. Everything is read locally in your browser and nothing is uploaded.
Common questions
What is the difference between screen resolution and viewport size?
Screen resolution is the full pixel dimensions of your monitor. The viewport is the inner area of the browser window available to a web page — smaller than the screen because it excludes the browser's own toolbars and any OS bars.
What is device pixel ratio?
It is how many physical device pixels correspond to one CSS pixel. A ratio of 2 or 3 means a high-DPI display packing extra pixels for sharpness, which is why a '1440-wide' page can render on a much denser panel.
Why is my reported resolution smaller than my monitor's native one?
Operating-system display scaling and browser zoom change the logical pixel values the browser reports. Multiply the CSS resolution by the device pixel ratio to approximate the native physical resolution.
Do the values update when I resize?
Yes. Window, viewport, and orientation values refresh live as you resize the window, zoom, or rotate a device, so you can watch how the numbers respond.
Is any of this uploaded?
No. All the values are read from your browser and shown on the page. Nothing about your display is stored or sent to a server.