Screen Size Detector: How to Check All Your Monitor Specs
Knowing the specifications of your connected monitors is surprisingly useful for web developers, designers, and anyone who works with visual content. Whether you are debugging a responsive layout, testing how your site looks on different displays, or setting up a multi-monitor workstation, the Screen Size Detector gives you detailed hardware information instantly.
What the Screen Size Detector Shows
Our tool uses the getScreenDetails() API (and falls back to window.screen for older browsers) to detect every monitor connected to your system. For each display, it reports:
- Resolution — width and height in pixels
- Pixel ratio — device pixel ratio (1x, 2x Retina, 3x)
- Color depth — bits per pixel for color accuracy
- Refresh rate — how many times the screen refreshes per second
- Orientation — landscape or portrait mode
- Position — where each monitor is positioned relative to the primary display
The tool also shows a visual layout of your monitor arrangement, making it easy to understand your physical setup at a glance.
Why This Matters for Developers
Understanding your screen setup helps with:
- Responsive testing — know the exact pixel dimensions available for testing breakpoints
- DPI awareness — design assets that look sharp on Retina displays
- Media queries — write accurate
@mediarules based on resolution and pixel ratio - Multi-monitor layouts — understand how windows position across displays
How It Works
When you open the Screen Size Detector, it immediately queries your system for display information. The multi-monitor API is supported in Chrome and Edge; other browsers fall back to basic screen properties. No data is sent to any server — everything runs locally in your browser.
Try it now with the Screen Size Detector tool and see exactly what your monitors can do.