Screen Resolution Tester
Check your current screen resolution, viewport size and device info.
Your Screen Resolution
Browser Viewport
The usable area of your browser window right now.
Color Depth
The number of bits used to represent the color of a single pixel.
Pixel Ratio (DPR)
Ratio of physical pixels to CSS pixels (HiDPI/Retina).
Common Resolutions Reference
| 720p (HD) | 1280 × 720 |
| 1080p (Full HD) | 1920 × 1080 |
| 1440p (2K / QHD) | 2560 × 1440 |
| 2160p (4K / UHD) | 3840 × 2160 |
| Apple Retina (MacBook Pro 14") | 3024 × 1964 |
Screen Resolution Tester
Check your current screen resolution, viewport size and device info.
About Screen Resolution Tester
Screen Resolution Tester is a fast diagnostic tool that detects and displays your monitor's exact screen resolution, browser viewport size, pixel ratio, and basic device information. It is incredibly useful for web developers, designers, and IT support professionals diagnosing layout issues. When building responsive websites or debugging display problems, knowing the precise pixel dimensions of a user's screen is critical. This tool provides those metrics instantly upon page load, eliminating guesswork. All data is detected entirely client-side using native browser APIs, ensuring a secure and immediate read-out of your current display environment.
Key Benefits
- Instantly detect your screen resolution.
- View actual browser viewport dimensions.
- Check device pixel ratio (Retina display status).
- Useful for web developers and designers.
How to use
- Open Tool
Simply load the page; detection is automatic.
- View Resolution
Read your full monitor display size.
- View Viewport
Check your current browser window size.
- Resize Window
Watch the viewport numbers update dynamically as you resize.
Frequently Asked Questions
What is the difference between screen resolution and viewport?
Screen resolution is your physical monitor size. Viewport is the visible area inside your browser.
What is a device pixel ratio?
It indicates if you are using a high-density 'Retina' display (ratio > 1).
Does resizing my browser change my screen resolution?
No, but it does change your viewport size dynamically.
Is my device data collected?
No, detection runs locally and is not sent to any server.
Why do developers need this?
It helps debug CSS media queries and responsive design layouts.