What Is My Screen Size & Resolution?
Instantly check your screen resolution, viewport size, and display specifications
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About Screen Size and Resolution
Your screen size and resolution determine how much content you can see and how sharp it appears. Screen resolution is measured in pixels (width × height), indicating the total number of individual points of light your display can show.
Understanding Screen Resolution
Common screen resolutions include 1920×1080 (Full HD), 2560×1440 (2K/QHD), and 3840×2160 (4K/UHD). Higher resolutions provide sharper images and more screen real estate but require more processing power.
Viewport vs. Screen Size
Your viewport is the visible area of your browser window, while screen resolution is your entire display. The viewport is typically smaller than your screen resolution because of browser toolbars, operating system taskbars, and window borders.
Pixel Ratio (Retina/HiDPI)
Modern displays often have a pixel ratio greater than 1x, meaning physical pixels are smaller than CSS pixels. A 2x pixel ratio (Retina display) uses 4 physical pixels for every 1 CSS pixel, resulting in sharper text and images. This is common on smartphones, tablets, and high-end laptops.
Why Check Your Screen Size?
- Optimize websites and applications for your display
- Choose the right wallpaper or background image size
- Verify monitor specifications when troubleshooting
- Determine if your device supports certain resolutions
- Check if you're getting true Retina/HiDPI quality
Frequently Asked Questions
How do I check my screen resolution?
You can check your screen resolution instantly using our free online tool, which detects your display size, viewport, and pixel ratio directly in your browser. You can also check on Windows via Settings > Display, on macOS via System Settings > Displays, or on Linux through your display settings.
What is the difference between screen resolution and viewport size?
Screen resolution is the total number of pixels your physical display can show (e.g., 1920x1080), while viewport size is the visible area within your browser window. The viewport is typically smaller than screen resolution because it excludes browser toolbars, the address bar, and operating system elements like the taskbar.
What does pixel ratio (Retina/HiDPI) mean?
Pixel ratio indicates how many physical pixels are used to render one CSS pixel. A 2x ratio (common on Retina displays) means 4 physical pixels render each logical pixel, producing sharper text and images. Most modern smartphones have a 2x or 3x pixel ratio, while standard desktop monitors typically have a 1x ratio.
What is my screen's aspect ratio and why does it matter?
Your screen's aspect ratio is the proportional relationship between its width and height. Common ratios include 16:9 (widescreen), 16:10 (common on laptops), and 21:9 (ultrawide). Aspect ratio matters for video playback, gaming, and productivity — a wider ratio provides more horizontal workspace while a taller ratio is better for reading and coding.