Screen Resolution Checker
Check browser-reported screen size, viewport dimensions and device pixel ratio. Understand display scaling and why these differ from native resolution.
Display information
How to use this tool
- Open the page on the display you want to inspect.
- Read screen size, viewport and pixel ratio together.
- Resize the window or use fullscreen to see the viewport change.
What the results mean
Screen and viewport dimensions are reported in CSS pixels. Operating-system scaling and browser zoom affect these values and device pixel ratio. Multiplying by the ratio is not a reliable universal way to discover the panel’s native resolution.
Common problems
For the exact configured or native resolution, check your operating system’s display settings. On a multi-monitor setup, move the window to the target display and reload if the browser keeps reporting the previous screen.
Privacy and data use
The page reads standard browser display properties locally. Copy/share includes dimensions and pixel ratio only.
Frequently asked question
Why does a 4K monitor show a smaller size?
Display scaling can expose a smaller CSS-pixel screen size to the browser. That does not mean the physical panel has fewer pixels. Check display settings to confirm its native mode.