Screen resolution refers to the total number of pixels that can be displayed on a screen, typically expressed as width × height (e.g., 1920×1080).
What Is My Screen Size?
Detecting... Screen Size
Screen Resolution: Detecting...
How to Check Your Screen Size
Our screen size checker instantly displays your device's screen resolution, viewport size, and pixel density. This tool is essential for web developers, UI/UX designers, and QA professionals who need to test responsive designs across different devices.
For Developers
Test responsive designs and debug viewport issues
For Designers
Ensure designs work across different screen sizes
For QA
Verify display compatibility and pixel density
Device Information
Display Properties
Aspect Ratio
Detecting...
Device Pixel Ratio (DPR)
Detecting...
Color Depth
Detecting...
System & Browser
Operating System
Detecting...
Browser
Detecting...
Advanced Information
Cookies Enabled
检测中...
Touch Support
检测中...
User Agent
Related Resources
Loading...
Frequently Asked Questions
Viewport size is the visible area of a web page within the browser window, measured in CSS pixels.
Device Pixel Ratio (DPR) is the ratio between physical pixels and CSS pixels, used to support high-resolution (Retina) displays.
Understanding screen sizes, resolutions, and DPR helps developers create responsive websites that look great on all devices. It's essential for optimizing user experience across different screens.
It's good practice to check device information when testing responsive designs, debugging display issues, or ensuring your website works correctly across different devices and browsers.