Screen Resolution Checker
Check your screen resolution, pixel ratio, and display information.
Understanding Screen Resolution
Screen resolution refers to the number of pixels displayed on your screen. It's typically expressed as width × height (e.g., 1920 × 1080). However, with modern high-DPI displays, there's more to consider than just the resolution.
Key Concepts
Physical Resolution: The actual number of pixels on your display
Effective Resolution: Physical resolution × pixel ratio
Pixel Ratio: How many physical pixels are used to display one CSS pixel
Color Depth: Number of bits used to represent each pixel's color
High-DPI/Retina Displays
High-DPI displays (like Apple's Retina displays) have a pixel ratio greater than 1. This means
they use multiple physical pixels to display one CSS pixel, resulting in sharper images and text.
- Standard displays: 1x pixel ratio
- Retina displays: 2x or higher pixel ratio
- Some modern displays: 1.5x or 1.75x pixel ratio
Why Resolution Matters
- Determines the clarity of displayed content
- Affects how much content can fit on screen
- Impacts the quality of images and videos
- Influences the design of responsive websites
Tips for Web Developers
- Use relative units (rem, em) instead of pixels
- Test your website on different screen sizes
- Provide high-resolution images for Retina displays
- Use CSS media queries for responsive design
How it Works
This tool uses the browser's Screen API to detect your display information. It provides detailed information about your screen resolution, pixel ratio, color depth, and other display properties.
The tool works by:
1. Accessing the window.screen object
2. Reading various screen properties
3. Calculating effective resolution
4. Detecting high-DPI/Retina displays
Technical Details
- Uses the Screen API (window.screen)
- Detects device pixel ratio
- Calculates effective resolution
- Supports color depth detection
- Works across all modern browsers