Screen Resolution Tester
Find your screen resolution instantly. See your display width and height in pixels, then copy the numbers for design and troubleshooting.
Screen Resolution Tester
Result will appear here...
What this does
So you want to know your screen's resolution, the number of pixels across and down, without digging through system settings. This shows it. Open the page and it displays your display's width, height, and resolution straight away.
How to use it
Nothing to do. The page reads your screen size as it loads and shows the width, the height, and the two combined as a resolution.
How it works
The tool asks your browser for the size of your screen and prints the width and height it reports. There is no measuring or guessing, the figures come directly from the browser, and it all happens on your own machine.
What the numbers mean
It is worth knowing exactly what these numbers represent, because they are not always the panel's full pixel count. The browser reports the screen size in CSS pixels, which is the resolution after any display scaling your operating system applies. On a high resolution display set to, say, 150 or 200 percent scaling, the figure shown is smaller than the panel's true native pixels, so a 4K laptop scaled up might report 1920 by 1080 rather than 3840 by 2160.
So treat this as the resolution your browser and your apps are actually working with, which is usually the more useful number anyway, rather than the raw specification printed on the box. If the figure looks lower than you expected, display scaling is almost always the reason.
Questions people ask
Why is my resolution lower than the screen's advertised one?
Display scaling. The browser reports the resolution in CSS pixels, after your operating system's scaling is applied, so a scaled up high resolution screen shows a smaller figure than its native pixel count.
Is this my screen or my browser window?
Your whole screen. It reports the display's size, not the size of the browser window, which can be smaller.
Do I need to do anything to refresh it?
Just reload the page. It reads the figures fresh each time it loads.
Is anything sent anywhere?
No. The numbers come from your own browser and stay on your machine.
References
- MDN Web Docs. Screen: width property. https://developer.mozilla.org/en-US/docs/Web/API/Screen/width
- MDN Web Docs. Window: devicePixelRatio property. https://developer.mozilla.org/en-US/docs/Web/API/Window/devicePixelRatio
Sugam Baskota is a senior software engineer and Computer Science graduate from UT Arlington, with interests in user scripts, browser extensions, developer tooling, and productivity systems. He spends time building practical utilities and extensions in the kinds of workflows Eon is designed to simplify. At Eon Tools, he reviews useful, password, and developer tools.