Screen Resolution Checker
Find out your exact screen resolution and display size.
Check Screen Resolution, Viewport Size, & Device Pixel Ratio (DPR) Live
Whether you are a frontend web developer testing responsive media query breakpoints, a gamer configuring graphics settings for high FPS, a designer choosing high-DPI desktop wallpapers, or a buyer verifying a new laptop's display specs, knowing your exact screen resolution is essential.
In modern computing, screen resolution has become surprisingly nuanced. Back in the early days of bulky CRT monitors, your screen resolution was a simple single number: 800×600 or 1024×768.
Today, with high-density displays (like Apple Retina, Samsung AMOLED, and 4K monitors), your screen operates on two distinct layers: Physical Hardware Pixels and CSS Viewport Pixels scaled by a Device Pixel Ratio (DPR).
Our free Screen Resolution Checker detects your live display metrics instantaneously—including physical monitor resolution, current browser viewport dimensions, aspect ratio, color bit depth, and Retina scaling factor.
Why CSS Pixels Differ from Physical Hardware Pixels
Many developers and smartphone users get confused by display numbers. Here is why your phone's browser reports numbers that seem smaller than the box specs:
The Apple Retina & DPR Revolution
Consider a modern iPhone or high-end Android flagship. Physically, the glass display contains 2532 × 1170 microscopic hardware pixels.
If a website tried to render at a 1:1 scale on that screen, every button, paragraph, and navigation menu would appear the size of an ant, requiring a magnifying glass to tap!
To make content readable, the operating system uses a Device Pixel Ratio (DPR) of 3.0. It groups a 3×3 grid of physical hardware pixels to render a single crisp CSS Viewport Pixel.
That is why your mobile browser reports a comfortable viewport of roughly 390 × 844 pixels, while text and graphics look razor-sharp!
Standard Display Standards & Aspect Ratios
| Standard Name | Pixel Dimensions | Aspect Ratio | Common Devices |
|---|---|---|---|
| Full HD (1080p) | 1920 × 1080 | 16:9 | Standard office monitors, mid-range gaming laptops. |
| 2K / QHD (1440p) | 2560 × 1440 | 16:9 | High-end gaming monitors, creator desktops. |
| 4K UHD (2160p) | 3840 × 2160 | 16:9 | Smart TVs, professional video editing workstations. |
| MacBook Retina 14" | 3024 × 1964 | 16:10 | Apple MacBook Pro laptops. |
| Ultrawide QHD | 3440 × 1440 | 21:9 | Curved productivity and flight simulation displays. |
Frequently Asked Questions
What is the difference between Screen Size and Viewport Size?
"Screen Size" measures the total pixel grid of your physical monitor or phone glass. "Viewport Size" measures the active browser window area currently available to render a webpage (excluding operating system taskbars, browser address bars, and developer tools).
Does this tool update live if I resize my browser window?
Yes, our tool listens to window resize events in real-time. As you drag your browser edges or rotate your tablet between portrait and landscape, the viewport numbers update instantly.
What is Color Depth?
Color depth measures how many bits of data represent each pixel on screen. Standard 24-bit depth provides 16.7 million distinct colors (TrueColor), while modern 30-bit and 32-bit panels support HDR wide-gamut colors.