What Is My Screen Resolution
Find your screen resolution online free, plus viewport size, pixel ratio, aspect ratio and browser details. Free online screen size checker.
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Part of the toolkit
How to use What Is My Screen Resolution
- 1Open the page — your screen resolution is detected instantly
- 2See physical pixels, device pixel ratio, browser window size, aspect ratio, orientation and browser/OS details
- 3Use the aspect ratio calculator below to find a ratio or the matching height for a new width
Frequently asked questions
Why does my resolution look lower than my monitor's?▾
Browsers report screen size in CSS pixels. With display scaling (for example 150% on Windows or Retina on Mac) the physical resolution is CSS size × device pixel ratio — shown on the page as physical pixels.
What is the difference between screen size and viewport?▾
Screen size is the whole display. The viewport is the visible area of the browser window, which is smaller because of toolbars, tabs and window size. Web designers usually care about the viewport.
What is device pixel ratio (DPR)?▾
It is the number of physical pixels per CSS pixel. Most laptops and phones have a DPR of 2 or 3, so images need to be 2–3× larger to look sharp.
How do I calculate an aspect ratio?▾
Divide width and height by their greatest common divisor: 1920 × 1080 → 16:9. To keep the same ratio at a new width, new height = new width × height ÷ width.
Embed What Is My Screen Resolution on your website▾
Paste this snippet into your page. The embedded tool runs in your visitor's browser and shows a small “Powered by clkr.work” link.