Your Screen Resolution Is
What Is My Screen Resolution? — Free Online Screen Resolution Checker
Detecting your display...
What Is Screen Resolution?
Screen resolution refers to the number of pixels displayed on your screen, expressed as width × height (e.g., 1920 × 1080). Each pixel is a tiny point of light that, combined with millions of others, forms the images, text, and graphics you see on your display. A higher resolution means more pixels are packed into the same physical space, resulting in sharper and more detailed visuals.
Your device pixel ratio (DPR) indicates how many physical pixels correspond to a single CSS pixel. Modern high-resolution displays like Apple Retina screens typically have a DPR of 2x or 3x, meaning they use 4 or 9 physical pixels to render what would be a single pixel on a standard display. This makes text and images appear crisp and smooth.
The viewport size is the visible area of your browser window, which is usually smaller than your screen resolution. It represents the actual space available for web content, excluding browser chrome like the address bar, tabs, and bookmarks toolbar. Responsive web design relies on viewport dimensions to adapt layouts for different screen sizes.
Color depth measures how many bits are used to represent the color of a single pixel. Most modern displays use 24-bit color depth (8 bits per channel for red, green, and blue), which supports approximately 16.7 million colors. Some professional displays support 30-bit or even 48-bit color for more precise color reproduction in photography and video editing.
Understanding your screen resolution is important for web developers, designers, gamers, and anyone who wants to optimize their display settings. Whether you're troubleshooting display issues, choosing a new monitor, or ensuring your website looks great on all devices, knowing your exact resolution and related metrics is the first step.
Frequently Asked Questions
What is my screen resolution?
Your screen resolution is the number of pixels your display can show, measured as width × height (e.g., 1920 × 1080). This tool instantly detects and displays your exact screen resolution, viewport size, device pixel ratio, and color depth.
What is the difference between screen resolution and viewport size?
Screen resolution is the total number of pixels on your physical display, while viewport size is the visible area of your browser window where web content is rendered. The viewport is usually smaller than the screen resolution because it excludes browser UI elements like the address bar and tabs.
What is device pixel ratio (DPR)?
Device pixel ratio (DPR) indicates how many physical pixels correspond to a single CSS pixel. A DPR of 2x (common on Retina displays) means 4 physical pixels are used for every CSS pixel, resulting in sharper text and images.
What is the most common screen resolution?
The most common screen resolution is 1920 × 1080 (Full HD or 1080p), used by approximately 65% of desktop users worldwide. Other popular resolutions include 2560 × 1440 (QHD), 3840 × 2160 (4K UHD), and 1366 × 768 (HD).
Does screen resolution affect performance?
Yes, higher screen resolutions require more processing power, especially for gaming and video editing. A 4K display pushes four times as many pixels as 1080p, which can reduce frame rates in games unless you have a powerful GPU.
How do I change my screen resolution?
On Windows, go to Settings → System → Display → Display resolution. On Mac, go to System Settings → Displays → Resolution. On Linux, use Settings → Displays. You can also right-click on your desktop and look for Display settings.