What is my screen resolution?
Your display, as your browser sees it: physical and scaled resolution, pixel ratio, viewport, colour depth and capabilities. Nothing is sent anywhere.
Physical resolution (estimated from CSS size × pixel ratio)
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Resize the window and the viewport updates live. Browsers report some values rounded, and colour depth is often reported as 24-bit even on 10-bit setups.
Common monitor resolutions
| Name | Pixels | Aspect |
|---|---|---|
| HD / 720p | 1280 × 720 | 16:9 |
| Full HD / 1080p | 1920 × 1080 | 16:9 |
| WUXGA | 1920 × 1200 | 16:10 |
| QHD / 1440p | 2560 × 1440 | 16:9 |
| UWQHD | 3440 × 1440 | 21:9 |
| 4K UHD | 3840 × 2160 | 16:9 |
| 5K | 5120 × 2880 | 16:9 |
| DQHD (super ultrawide) | 5120 × 1440 | 32:9 |
| 8K UHD | 7680 × 4320 | 16:9 |
If the physical resolution above is lower than your monitor's native resolution, set it in your OS display settings; non-native resolutions look soft. The sharpness test shows the difference.
Questions people ask
Why does this show a lower resolution than my monitor?
Browsers report resolution in CSS pixels, which are scaled by your OS display scaling. A 3840×2160 monitor at 150% scaling reports 2560×1440 CSS pixels with a device pixel ratio of 1.5. Multiply the two to get the physical resolution, which this page does for you.
What is device pixel ratio?
The number of physical pixels per CSS pixel. 1 on a standard monitor at 100% scaling, 2 on most Retina and high-DPI displays, and fractional values like 1.25 or 1.5 at Windows scaling levels.
Can a website see my exact monitor model?
No. Browsers expose the screen size, pixel ratio, colour depth and some capability queries, not the model name or serial number.
What is the difference between screen and window size?
Screen size is the whole display. Window (viewport) size is the area the page can use, excluding browser toolbars and the taskbar. Web designers care about viewport; monitor buyers care about the screen.