What is my screen resolution?
Your screen resolution is the number of pixels your display shows, written as width × height. The panel below reads it from your browser the moment the page loads — no download and nothing to configure.
Reading your display…
This runs locally in your browser. No device data is uploaded.
Reading the result
Screen resolution is the whole display. Browser viewport is the part of it this page is being drawn in, so it is always smaller — it excludes the browser's own toolbars, and shrinks again if the window is not maximised. If you are trying to match a wallpaper or a video resolution, the screen figure is the one you want.
Device pixel ratio is how many physical pixels the display packs into one CSS pixel. A ratio of 1 is a conventional monitor. 2 or 3 means a high-density screen, which is why a phone reporting 390 pixels wide still looks razor sharp. A value like 1.25 or 1.5 almost always means desktop scaling is switched on.
Why it might not match the number on the box
A display reports what it is currently running at, not what it is capable of. A 4K monitor set to 1080p reports 1080p, and everything on it looks softer than it should. Windows and macOS both do this silently after a driver update or when a cable cannot carry full bandwidth.
If the figure below is lower than your monitor's rating, change it in your system display settings, then check the cable — some HDMI versions cannot carry 4K at a high refresh rate, where DisplayPort usually can.
Frequently asked questions
- Does this show the resolution of all my monitors?
- No. It reports the display the browser window is currently on. Drag the window to another monitor and reload to check that one.
- Why is my phone's resolution lower than advertised?
- Phones report a logical size, then multiply it by the device pixel ratio to get physical pixels. A phone listed as 1170 pixels wide typically reports 390 with a ratio of 3. Multiply the two and you get the number from the spec sheet.
More about this test
The full screen resolution test page covers how the test works and what the common faults look like.
Open the Screen Resolution Test →