Screen Resolution Checker

Check your screen resolution, pixel ratio, and display information.

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.

What is Screen Resolution?

Screen resolution refers to the number of pixels displayed on your screen, typically expressed as width × height (e.g., 1920 × 1080). Higher resolutions provide sharper, more detailed images.

Understanding Display Properties

  • Screen Resolution: The total number of pixels your display can show
  • Pixel Ratio: The ratio between physical pixels and CSS pixels (important for high-DPI displays)
  • Color Depth: The number of bits used to represent each pixel's color
  • Available Space: The usable screen area (excluding taskbars, docks, etc.)

Technical Details

The tool works by accessing the window.screen object, reading various screen properties, calculating effective resolution, and detecting high-DPI/Retina displays.

  • Uses the Screen API (window.screen)
  • Detects device pixel ratio
  • Calculates effective resolution
  • Supports color depth detection
  • Works across all modern browsers

High-DPI Displays

High-DPI (High Dots Per Inch) displays, also known as Retina displays, have a pixel ratio greater than 1. This means they pack more physical pixels into the same screen space, resulting in sharper, more detailed images.

About This Tool

This tool is designed to help you understand your system's configuration and identify potential privacy and security issues.

All analysis is performed locally in your browser - no passwords, personal data, or system information is sent to our servers.

Use this tool to assess your privacy status, check for potential leaks, and understand how your system appears to websites.