Resolution questions, fixes and result guides.
Practical answers for common resolution problems, confusing results and setup questions — with a direct path back to the live test.
Why is browser resolution different from my monitor resolution?
The browser can report logical screen size, viewport size and device-pixel ratio, which are affected by scaling and zoom. The physical panel resolution may therefore be larger than the CSS pixel dimensions shown to a web page.
What is device pixel ratio (DPR)?
DPR is the ratio between device pixels and CSS pixels used by the browser. High-density displays can use multiple physical pixels to render one CSS pixel, which keeps interface elements readable while preserving sharpness.
Does browser zoom change viewport resolution?
Yes. Browser zoom changes the CSS-pixel layout seen by the page, so viewport dimensions and effective rendering scale can change even though the physical monitor resolution does not.
Why is my viewport smaller than my screen resolution?
The viewport excludes browser chrome and is affected by window size and zoom. Operating-system scaling can also change logical dimensions.
What is device pixel ratio?
Device pixel ratio describes the relationship between CSS pixels and device pixels used by the browser. High-density displays commonly report values greater than 1.
How accurate is this resolution tool?
Browser zoom and operating-system scaling can make viewport size differ from physical panel resolution.
What should I do if the resolution result looks wrong?
Set browser zoom to 100%, check operating-system scaling and move the browser to the correct monitor before comparing values.