Device Pixel Ratio Checker
Check your screen's device pixel ratio (DPR), physical vs CSS resolution, and pixel density in real-time. 100% private, free, and offline client-side.
Physical Silicon vs. CSS Logical Resolution Matrix
Interactive Pixel Grid & Sharpness Visualizer Studio
Inspect subpixel anti-aliasing and raster edge smoothing across 1x (Standard), 2x (Retina), and 3x (Super Retina) displays.
Simulate Industry Display Standards
Diagnostic Audit Receipt & Export
================================================== OCTALONE DEVICE PIXEL RATIO & DISPLAY AUDIT ================================================== Timestamp : 2026-10-13T00:00:00.000Z Device Pixel Ratio : 1.00x Display Tier : Standard Definition Display Badge : 1x Standard (96 DPI) Estimated Density : ~96 CSS DPI (96 * DPR) Subpixel Ratio : 1 Physical Pixels per 1 CSS Pixel -------------------------------------------------- HARDWARE & RESOLUTION METRICS -------------------------------------------------- Physical Resolution : 1920 × 1080 px Total Megapixels : 2.07 MP Aspect Ratio : 16:9 (1.78:1) CSS Screen Size : 1920 × 1080 CSS px Browser Viewport : 1440 × 820 CSS px (1440 × 820 Physical px) Color Depth : 24-bit Screen Orientation : Landscape (0°) -------------------------------------------------- DIAGNOSTIC STATUS : 100% Client-Side Verified ==================================================
Frequently Asked Questions
Device Pixel Ratio (window.devicePixelRatio) represents the ratio between physical hardware pixels on your display and logical CSS pixels used by web layouts. Standard monitors operate at 1.0x DPR (1 CSS pixel = 1 hardware pixel). High-density displays like Apple Retina or 4K monitors at 200% scaling operate at 2.0x DPR, where a single 1x1 CSS pixel is rendered using a 2x2 grid of 4 physical silicon pixels for razor-sharp text and curves.
Physical pixels are the microscopic physical silicon dots or subpixels (red, green, blue) on your display panel. CSS pixels, defined by the W3C, are an angular measurement of visual size (1 CSS pixel = 1/96 inch visual angle). By separating logical CSS pixels from physical hardware dots, high-resolution screens can display sharp imagery without shrinking website text and buttons down to unreadable sizes.
Browser zoom directly alters window.devicePixelRatio! When you press Ctrl + to zoom in to 150% on a 1.0x display, the browser reports a DPR of 1.5x. Similarly, Windows Display Scaling (e.g. 125%, 150%, 175%) scales the operating system interface by adjusting the reported DPR so text remains comfortably readable.
When a standard 100x100 pixel bitmap image is displayed on a 2.0x DPR screen in a 100x100 CSS pixel box, the browser must stretch those 100 image pixels across 200x200 hardware dots (40,000 physical pixels instead of 10,000), causing blurriness. Providing @2x (200x200 px) or @3x (300x300 px) assets or SVG vectors ensures that every physical hardware dot receives crisp image data.
The subpixel multiplier represents the total number of physical hardware pixels powering each single CSS pixel. Because pixel area scales quadratically with linear dimensions, it is calculated as DPR squared (DPR²). At 1.0x DPR, 1 physical dot powers 1 CSS pixel; at 1.5x DPR, 2.25 physical dots power 1 CSS pixel; at 2.0x DPR, 4 physical dots power 1 CSS pixel; and at 3.0x DPR, 9 physical dots power 1 CSS pixel.
Yes, 100%! All Device Pixel Ratio calculations, screen dimension queries, media query listeners, and canvas visualizer renderings execute purely within your local browser process in volatile memory. Zero screen dimensions, hardware specs, or fingerprinting data are ever sent over the internet or saved to remote servers.