Detect screen and viewport resolution with responsive breakpoint testing and real-time resize updates
Utility Tools
About This Tool
Screen Resolution Detector instantly displays your screen resolution, viewport size, device pixel ratio, available screen area, orientation, and responsive breakpoint — all updating in real time as you resize your browser window.
Key Features
- Detect screen resolution and viewport size instantly
- Display device pixel ratio and available screen area
- Show current orientation (landscape or portrait)
- Responsive breakpoint indicator (XS, SM, MD, LG, XL, XXL)
- Real-time updates as you resize the browser window
- No installation required, runs entirely in your browser
Use Cases
- Check your screen resolution and viewport size for web development
- Verify which responsive breakpoint your layout currently targets
- Test how your website responds to different window sizes
- Identify device pixel ratio for high-DPI display testing
- Quickly check screen orientation during responsive design work
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Frequently Asked Questions
What information does the Screen Resolution Detector show?
The tool displays your screen resolution, viewport size, device pixel ratio, available screen area, current orientation (landscape or portrait), and the responsive breakpoint your viewport falls into.
What is the difference between screen resolution and viewport size?
Screen resolution is your monitor's physical pixel dimensions (e.g., 1920x1080). Viewport size is the visible browser window area, which is usually smaller than the full screen due to browser chrome, taskbars, and zoom settings.
What is device pixel ratio?
Device pixel ratio (DPR) is the ratio between physical screen pixels and CSS pixels. A DPR of 2 means each CSS pixel uses 2x2 physical pixels, common on Retina and high-DPI displays. This affects image rendering and responsive design.
How can I test responsive breakpoints?
The tool shows your current viewport width and height in real time. Resize your browser window to see how dimensions change. This helps identify which CSS breakpoints are active at different window sizes.
Does it detect screen orientation?
Yes. The tool shows whether your screen is in portrait or landscape orientation, which is particularly useful when testing responsive layouts on mobile devices or rotating monitors.