Instantly check your physical screen resolution, active viewport size, device pixel ratio, color depth, browser window outer dimensions, and current orientation.
Web display sizes are parsed in two distinct pixel layouts:
CSS framework utilities structure layout layouts according to specific breakpoints. This allows components to scale or stack gracefully depending on screen size. Here are the typical framework standards:
Physical resolution is the total number of hardware pixels on the screen (e.g. 3840x2160 on a 4K display). CSS resolution (viewport size) is the number of logical pixels used by the browser to scale content (e.g. 1920x1080). High-DPI screens use multiple physical pixels to render one logical CSS pixel for sharper text and graphics.
Device Pixel Ratio is the ratio between physical hardware pixels and logical CSS pixels. A Retina display or high-density mobile screen typically has a DPR of 2.0 or 3.0, meaning a 100px wide box occupies 200 or 300 physical hardware pixels.
Viewport size represents the canvas size inside the browser window where the page is visible. Resizing your browser window, opening developer tools, or toggling mobile device simulation immediately updates the viewport dimensions.
Standard responsive frameworks define breakpoints to rearrange layouts: Mobile/Extra Small (<640px), Small/Tablet (640px - 768px), Medium/Large Tablet (768px - 1024px), Desktop (1024px - 1280px), Large Desktop (1280px - 1536px), and Ultra-wide (>=1536px).
It evaluates the width and height of the viewport: if the width is greater than or equal to the height, the orientation is "Landscape"; otherwise, it is "Portrait". On mobile devices, it also listens to orientation change events.
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