Check Your Screen Resolution
Check your screen resolution, physical vs CSS pixels, device pixel ratio (DPR), viewport size, and aspect ratio in real time. 100% private, free, and instant.
Core Display Metrics
1920 × 1080
1920 × 1080
1440 × 820
1920 × 1040
Optical & Hardware Characteristics
1.00x
16:9
24-bit
Landscape
Display Engineering Knowledge Base
Physical Pixels vs. CSS Logical Pixels
When web browsers render content, they work in an abstract coordinate space called CSS Logical Pixels. On older displays with 100% scale (DPR = 1.0), 1 CSS pixel corresponded directly to 1 physical LED diode on the screen panel.
On modern High-DPI displays (such as Apple Retina screens, 4K monitors, or modern smartphones), multiple physical pixels are grouped together into a single CSS pixel. For example, at a 2.0x scale, a 1920 × 1080 CSS viewport actually illuminates a crisp 3840 × 2160 physical hardware grid ($2 \times 2 = 4$ hardware pixels per CSS point).
Itemized Display Diagnostic Receipt
Deterministic plaintext snapshot for hardware audits, QA bug reports, and display logs.
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DISPLAY RESOLUTION DIAGNOSTIC RECEIPT
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Detected At (UTC) : 2026-10-07T12:00:00.000Z
Physical Resolution : 1920 × 1080 px
Standard Category : Full HD (FHD (1080p))
Total Megapixels : 2.07 MP
CSS Logical Res : 1920 × 1080 px
Device Pixel Ratio : 1.0x (100% Scale)
Browser Viewport : 1440 × 820 px
Available Desktop : 1920 × 1040 px
Aspect Ratio : 16:9 (1.78:1)
Color Depth : 24-bit (16.7 Million Colors (8-bit per channel))
Orientation : Landscape (0°)
User Agent Platform : Client Browser Memory (Offline)
==================================================Frequently Asked Questions
Physical resolution represents the actual silicon micro-LEDs / pixels manufactured on your physical display hardware (e.g., 1920 × 1080 or 3840 × 2160 device pixels). CSS logical resolution is the coordinate grid utilized by web browsers and media queries to layout text and images. On high-density screens (like Retina displays or 4K monitors with OS scaling), multiple physical pixels map to a single CSS pixel to render razor-sharp text and graphics without making interface elements microscopically tiny.
Device Pixel Ratio (window.devicePixelRatio) is the multiplier between physical hardware pixels and logical CSS pixels (Physical = CSS × DPR). Standard desktop monitors operate at 1.0x (100% scale). Many Windows laptops default to 1.25x (125%) or 1.5x (150%) scaling for comfortable readability. Apple Retina displays and 4K monitors default to 2.0x (200%), while modern flagship smartphones use 2.5x to 3.0x scaling.
Your screen resolution measures the full hardware dimensions of your physical display panel. Your browser viewport (window.innerWidth × window.innerHeight) measures only the active webpage rendering canvas currently available inside your browser window. Browser title bars, bookmarks, tabs, developer tools, address bars, scrollbars, and your operating system's taskbar or dock reduce the available viewport size compared to the full monitor resolution.
Click the 'Fullscreen' button (or press F11 on Windows / Ctrl+Cmd+F on macOS) on this page. Entering edge-to-edge fullscreen expands the browser canvas to consume the entirety of your display panel, allowing you to verify the exact native dimensions of your screen without window borders or taskbars.
The aspect ratio is the proportional relationship of screen width to height. We compute the exact reduced fractional ratio using the Euclidean Greatest Common Divisor (GCD) algorithm. For common laptop resolutions like 1366 × 768 (which technically simplifies to the unreduced fraction 683:384), our diagnostic engine applies a ±1.5% proximity matching algorithm to correctly classify it under the global broadcast standard 16:9 Widescreen format.
No. All resolution queries, viewport calculations, DPR detection, and diagnostic receipt generation happen 100% locally in your browser memory using native Web APIs. Zero display metrics, system properties, or hardware information are transmitted across the internet, ensuring complete privacy.