Screen Resolution Checker
Your screen, measured live
Resize this browser window or rotate your phone and every number above updates instantly. Everything is read locally by your browser - nothing is uploaded, stored or tracked.
If you have ever typed "what is my screen resolution" into a search engine, this page is the answer - with no clicking at all. The moment it loads, this free Screen Resolution Checker reads your display directly and shows your exact screen resolution in big type at the top, followed by the measurements people usually need alongside it: the usable screen area, your browser window size, the viewport size websites actually see, your device pixel ratio, aspect ratio, orientation and colour depth. Rotate your phone or drag your browser window smaller and every figure updates live, so you can watch the viewport change as you resize.
The distinction that confuses most people is screen resolution versus viewport size. Your screen resolution is the full pixel grid of the display itself, such as 1920 x 1080. Your viewport is only the part of the browser window where a web page renders - smaller, because toolbars, tabs and scrollbars take their share. Web designers build for the viewport, gamers and monitor shoppers care about the full resolution, and support teams ask for both when diagnosing "the page looks broken" reports. The device pixel ratio explains why a phone can report a modest viewport while having a very sharp screen: modern displays pack two or three physical pixels into every CSS pixel. Nothing on this page is sent anywhere - your browser reports these numbers locally and they are never stored.
How to use
- Just open the page - your screen resolution appears at the top instantly, no button to press.
- Read down the list for the available area, window size and viewport size.
- Resize the window or rotate your device to see every value update in real time.
- Click "Copy these details" to copy a tidy summary you can paste into a support ticket or message.
Frequently asked questions
What is my screen resolution right now?
It is the large number at the top of this page, read straight from your device. Common results include 1920 x 1080 (Full HD), 1366 x 768 on older laptops, 2560 x 1440 (QHD) and 3840 x 2160 (4K). On phones the figure is your display's physical pixels, which is why it can look surprisingly large.
Why is my viewport smaller than my screen resolution?
Because the viewport is only the page area inside your browser. The operating system taskbar, browser tabs, address bar and bookmarks bar all sit outside it, and on high-density screens the viewport is also measured in CSS pixels rather than physical ones. Both numbers are correct - they simply measure different things.
What does device pixel ratio mean?
It is how many physical pixels your screen uses to draw one CSS pixel. A ratio of 1 is a standard display; 2 or 3 is a Retina or high-density phone or laptop screen. Higher ratios make text and images sharper, and they are why screenshots from phones come out much larger than the screen seems to be.
How do I change my screen resolution?
This checker only reports your current settings. To change them, use your system display settings: on Windows, Settings then System then Display; on macOS, System Settings then Displays; on Android and iPhone the resolution is fixed by the hardware in most cases. Lowering resolution makes everything bigger; raising it fits more on screen.
Is any of this information private?
Screen size on its own cannot identify you, and on this page it never leaves your device - the numbers are calculated and displayed locally in your browser, not uploaded or logged.
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