Screen Resolution Checker
Detect screen resolution, viewport size, DPI, color depth and display info in real time.
What is screen resolution?
Screen resolution refers to the number of pixels displayed on your screen, expressed as width × height (e.g., 1920×1080). Higher resolution means more pixels and sharper images.
What is device pixel ratio (DPR)?
DPR is the ratio of physical pixels to CSS pixels on your device. A DPR of 2 means one CSS pixel uses 2×2 physical pixels. Retina and high-DPI displays typically have DPR of 2 or 3.
What is the difference between screen and viewport?
Screen resolution is the total display size in pixels. Viewport is the visible area of the web page in the browser window, which is smaller than the screen due to browser chrome, toolbars, and scrollbars.
Why does my resolution change when I resize the browser?
The viewport size changes when you resize the browser window, but the screen resolution stays the same. This tool tracks both in real time so you can see the difference.
How do I check my screen resolution?
Open this tool and it will automatically detect your screen resolution. You can also check manually: on Windows, right-click desktop → Display Settings; on Mac, go to System Preferences → Displays.
What are common screen resolutions?
Common resolutions include: 1366×768 (laptops), 1920×1080 (Full HD, most common), 2560×1440 (2K/QHD), 3840×2160 (4K UHD) and 2560×1600 (MacBooks).
What is PPI (Pixels Per Inch)?
PPI indicates the number of pixels per inch, measuring the pixel density of a screen. Higher PPI means finer display and clearer text and images.
How do I change my screen resolution?
Change it in your OS display settings: Windows → Settings → System → Display → Display Resolution; Mac → System Preferences → Displays → Select resolution. Using the native resolution is recommended for best results.
What is aspect ratio?
Aspect ratio is the proportional relationship between screen width and height. Common ratios include 16:9 (widescreen, most monitors and TVs), 16:10 (productivity laptops), 4:3 (older monitors) and 21:9 (ultrawide monitors).
What is color depth?
Color depth indicates how many colors your display can show. 8-bit color depth shows about 16.7 million colors (standard), 10-bit shows about 1.07 billion colors (HDR displays), and higher bit depths produce smoother color transitions.
How to Use Screen Resolution Checker
View your screen resolution, viewport size, DPI and color depth in real time, right in your browser. Nothing is reported to any server — the reading happens locally.
- Read the screen resolution figure, which shows the full pixel dimensions of your display.
- Check the viewport size, the space actually available to web content inside the browser window.
- Resize the browser window and watch the viewport update live while the screen resolution stays fixed.
- Note the DPI and color depth values to understand how your system scales content and renders colors.
Browser zoom changes the reported viewport, so set zoom to 100% when you need the raw CSS pixel dimensions.
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