What is screen resolution?
Screen resolution is the number of pixels your display shows, written as width × height. A Full HD screen is 1920 × 1080: 1,920 pixels across and 1,080 down, about 2.1 million in all. More pixels on the same size of screen means sharper text and images, which is why a 27-inch monitor looks much crisper at 2560 × 1440 than at 1920 × 1080.
The resolution is not the same as the screen size. If you searched what is my screen size, note that screen size is the diagonal in inches, while resolution is the pixel count; a browser can measure only the pixels. A 13-inch laptop and a 65-inch TV can both be 3840 × 2160 (4K). The number of pixels per inch is what changes.
Why the numbers can look different
Windows, macOS and phones enlarge text and buttons so they are readable on sharp screens. A 1920 × 1080 laptop set to 125% scaling tells websites it is 1536 × 864, and an iPhone tells websites it is 393 pixels wide while the panel has 1,179. This page multiplies by the device pixel ratio to show the real pixel count first, and lists the scaled CSS size too, because that is the size websites design for.
Browser zoom changes the pixel ratio as well. If the page warns that your ratio looks unusual, press Ctrl+0 (Cmd+0 on a Mac) to reset the zoom and the result becomes exact. The browser window size is smaller than the screen because of the taskbar, tabs and window borders; it changes live as you resize the window, which is handy for testing a website at an exact width.
How to check screen resolution in your settings
- Windows 11 and 10: Settings › System › Display › Display resolution. The value marked (Recommended) is the native resolution of your screen.
- Mac: Apple menu › System Settings › Displays. macOS shows a "looks like" size; for the panel's native pixels, Apple menu › About This Mac › More Info.
- Android: Settings › Display › Screen resolution (on Samsung and some others); not every phone shows it.
- iPhone and iPad: there is no setting; this page shows the real pixels, or check Apple's tech specs for your model.
A screen resolution checker like this one is also a quick way to confirm a new monitor runs at its native resolution: if a 2560 × 1440 monitor shows 1920 × 1080 here with a ratio of 1, the computer is sending the wrong resolution and the picture will look soft.
Common screen resolutions
| Resolution | Name | Aspect ratio | Typical screens |
|---|---|---|---|
| 1366 × 768 | HD (WXGA) | 16:9 | Older and budget laptops |
| 1920 × 1080 | Full HD (1080p) | 16:9 | Most laptops and monitors |
| 1920 × 1200 | WUXGA | 16:10 | Business laptops, office monitors |
| 2560 × 1440 | QHD (1440p) | 16:9 | 27-inch monitors, gaming |
| 2560 × 1600 | WQXGA | 16:10 | 13 to 16-inch laptops |
| 3440 × 1440 | Ultrawide QHD | 21:9 | 34-inch ultrawide monitors |
| 3840 × 2160 | 4K UHD | 16:9 | TVs, 27 to 32-inch monitors |
Once you know your resolution, check the panel itself with the dead pixel test and the refresh rate test; for HDR screens, the HDR test.
How we tested this tool
We tested the page in Google Chrome on Windows and in Microsoft Edge. By script we fed it 18 screen setups and checked every result: 1920 × 1080 at 100%, 125% and 150% Windows scaling (all shown as 1,920 × 1,080), an iPhone at a ratio of 3 (1,179 × 2,556, 19.5:9), a MacBook at a ratio of 2 (2,880 × 1,800, 16:10), 1366 × 768, 2560 × 1440, 2560 × 1600, 3440 × 1440 ultrawide and 4K, plus zoomed browsers at 110% and 80%, which show the zoom warning, a browser that hides the screen size, and one that reports a screen smaller than its own window. In Edge with the display scaling set to 150% the page reported a ratio of 1.5 and multiplied it correctly. On a 375 px phone view it showed 750 × 1,624 at a ratio of 2, and the browser window size changed live when the window was resized. Testing caught two problems we fixed: a browser that reports 0 × 0 showed “NaN”, and browsers that hide the real screen size gave numbers smaller than the window without explanation.
Frequently asked questions
Whats my screen resolution?
It is the big number at the top of this page, measured in real pixels, for example 1920 × 1080. It appears as soon as the page loads, with no download or sign-up, and works on Windows, Mac, Chromebook, Android, iPhone and iPad.
Why does it say 1536 × 864 when my screen is 1920 × 1080?
That is the scaled size: Windows at 125% scaling makes everything bigger, so websites see 1536 × 864. This page multiplies by the pixel ratio (1.25) and shows the real 1920 × 1080 as your screen resolution, with the scaled size in the table.
Is the screen resolution the same as the screen size?
No. Resolution is the number of pixels (such as 2560 × 1440); screen size is the diagonal in inches (such as 27 inches). The browser can report the pixels but not the physical size of your screen.
Why is the browser window smaller than my screen?
The window leaves room for the taskbar or dock, the tabs, the address bar and the window borders. Resize the window and the viewport size on this page updates live, which helps when you test a website at a set width.
Does browser zoom change the result?
Yes. Zoom changes the device pixel ratio that the browser reports. If the ratio looks unusual, such as 1.1 or 0.9, the page warns you; press Ctrl+0 (Cmd+0 on a Mac) to reset the zoom for an exact result.
Is my information sent anywhere?
No. The numbers come from your own browser and stay on this page. Copy results only copies the text to your clipboard.