What Is My Screen Resolution
Your screen resolution, browser viewport, device pixel ratio and real physical pixels are detected instantly, plus colour depth, aspect ratio, orientation, HDR, colour gamut and touch support.
Detecting your display…
Values are in CSS pixels unless marked physical. Browser zoom changes them: press Ctrl/Cmd + 0 to reset zoom to 100% for your true numbers.
How to use the What Is My Screen Resolution
- Open the page: your screen resolution appears at the top straight away, no clicks or permissions needed.
- Resize the browser window or rotate your phone: the viewport size and drawing update live.
- Read the detail cards for pixel ratio, physical pixels, colour depth, aspect ratio, HDR, gamut and touch.
- Press Check again after moving the window to another monitor or changing the zoom level.
- Copy all as text to paste the full report into a support ticket, forum post or chat.
Common screen resolutions and their names
| Name | Resolution | Aspect ratio | Total pixels | Typical use |
|---|---|---|---|---|
| HD / 720p | 1280 × 720 | 16:9 | 0.92 MP | Small TVs, budget laptops |
| WXGA | 1366 × 768 | ≈16:9 | 1.05 MP | Older and entry-level laptops |
| HD+ | 1600 × 900 | 16:9 | 1.44 MP | Mid-range laptops |
| Full HD / 1080p | 1920 × 1080 | 16:9 | 2.07 MP | Most desktop monitors and laptops |
| WUXGA | 1920 × 1200 | 16:10 | 2.30 MP | Business laptops, productivity monitors |
| QHD / 1440p | 2560 × 1440 | 16:9 | 3.69 MP | Gaming and design monitors |
| UWQHD | 3440 × 1440 | ≈21:9 | 4.95 MP | Ultrawide monitors |
| 4K UHD / 2160p | 3840 × 2160 | 16:9 | 8.29 MP | 4K monitors and TVs |
| 5K | 5120 × 2880 | 16:9 | 14.7 MP | Large high-density desktop displays |
| 8K UHD | 7680 × 4320 | 16:9 | 33.2 MP | Large premium TVs |
CSS pixels, physical pixels and pixel ratio
Web browsers measure the screen in CSS pixels, a size unit that stays roughly the same physical size on every device. High-density screens pack several hardware pixels into each CSS pixel, and the device pixel ratio tells you how many:
Physical pixels = CSS pixels × device pixel ratio
- A laptop with a 2880 × 1800 panel at a ratio of 2 reports 1440 × 900 CSS pixels.
- A 4K monitor (3840 × 2160) at 150% Windows scaling has a ratio of 1.5 and reports 2560 × 1440.
- A phone with a 1170 × 2532 panel and a ratio of 3 reports 390 × 844.
Browser zoom also changes the ratio: at 125% zoom on a standard monitor the ratio becomes 1.25 and a 1920 × 1080 screen is reported as 1536 × 864.
How the aspect ratio is worked out
The aspect ratio is the width divided by the height, simplified by the greatest common divisor (GCD). For 1920 × 1080 the GCD is 120, giving 16:9. Some panels do not simplify neatly: 1366 × 768 reduces to 683:384, which is within 0.05% of 16:9, so the tool shows both the exact ratio and the nearest common one. Values within 3% of a familiar ratio such as 16:10, 21:9 or 19.5:9 are labelled with that name.
Frequently asked questions
What is my screen resolution?
The large number at the top of this page is your screen resolution as the browser reports it, in CSS pixels (width × height). The physical pixels card multiplies that by the device pixel ratio to show the real number of hardware pixels on panels with display scaling.
Why is my screen resolution smaller than my monitor's specification?
Operating systems scale the desktop on high-density screens. A 3840 × 2160 laptop panel at 150% scaling reports 2560 × 1440 CSS pixels with a device pixel ratio of 1.5. Multiply the two and you get the native resolution again.
What is the difference between screen size and viewport?
Screen size is the whole display. Available size removes the taskbar or dock. The viewport is only the part of the browser window where web pages are drawn, so it changes when you resize the window, open developer tools or zoom.
What is device pixel ratio (DPR)?
Device pixel ratio is how many physical pixels are used to draw one CSS pixel. It is 1 on a classic monitor, 2 or 3 on most phones and Retina screens, and it also changes when you zoom the browser in or out.
Does browser zoom change the numbers?
Yes. Zooming in raises the device pixel ratio and shrinks the reported screen and viewport size in CSS pixels. Reset zoom to 100% (Ctrl + 0 or Cmd + 0) to see your normal values.
How do I know if my screen supports HDR?
The HDR card uses the CSS dynamic-range media query. It shows Yes when the browser, operating system and display all report high dynamic range support, which usually requires HDR to be switched on in your system display settings.
Is any of this information sent anywhere?
No. Everything is read by JavaScript inside your browser and shown on this page. Nothing is uploaded or stored.