CSS viewport 2560 × 1440 pixels at 1× device pixel ratio. The exact size browsers report on the QHD (1440p).
The QHD (1440p) viewport is 2560 × 1440 CSS pixels, with a device pixel ratio of 1 on a 2560 × 1440 pixel display.
Test your site at QHD (1440p) (2560 × 1440)
When a user visits your site on the QHD (1440p), the browser reports window.innerWidth = 2560 and window.devicePixelRatio = 1. Your CSS media queries match against the 2560px CSS width, not the 2560 × 1440 physical pixel count of the panel.
At 2560px it hits Tailwind 2xl (1536px) and Bootstrap xxl (1400px).
For sharp full-width images, serve a source at least 2560px wide (2560 CSS px × 1 DPR) through srcset and let the browser pick it.
/* QHD (1440p): 2560×1440 CSS px, DPR 1 */
@media (max-width: 2560px) {
/* styles for this width and narrower */
}
@media (min-resolution: 1dppx) {
/* serve high-density assets */
}The QHD (1440p) reports a CSS viewport of 2560×1440 pixels. Browser toolbars reduce the visible height slightly, so window.innerHeight is usually smaller than the full screen height.
The QHD (1440p) uses a default device pixel ratio of 1. Each CSS pixel maps to 1×1 physical pixels on its 2560×1440 panel.
At 2560px wide it matches Tailwind 2xl (min-width 1536px) and Bootstrap xxl (min-width 1400px).
Open screensize.io, enter your URL and pick QHD (1440p) (2560×1440). It opens your site in a real browser window at exactly that CSS viewport, so media queries, container queries and JavaScript resize logic behave as they would on the device. For touch behaviour and the real browser engine, confirm on hardware before shipping.
See the full list of device viewport sizes →
Or browse common screen sizes by category →
Use screensize.io to preview your website at any of these resolutions instantly — no DevTools needed.
Open screensize.io →