Screen Resolution Tester
Live readings from your own display and browser window. Resize the window or rotate your phone and watch the numbers update instantly — no data ever leaves your device.
Screen size
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Window size
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Device pixel ratio
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Color depth
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Orientation
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Physical pixels
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Values update automatically on resize.
Common device classes
| Class | Typical window width | Example |
|---|---|---|
| Small phone | up to 380 px | Compact phones |
| Large phone | 381 – 575 px | Most modern phones |
| Small tablet | 576 – 767 px | 7–8 inch tablets |
| Large tablet | 768 – 991 px | 10 inch tablets |
| Laptop | 992 – 1439 px | 13–15 inch laptops |
| Desktop | 1440 – 1919 px | 24 inch monitors |
| Wide / 4K | 1920 px and above | Large or 4K screens |
How to use
- Open this page on any device or browser.
- Resize the window or rotate your phone — every value updates live.
- Press Copy Summary to paste the readings into a message or bug report.
Tips
- The window size (viewport) is what web designers need, not the full screen size.
- A device pixel ratio of 2 or 3 means a sharp Retina/HD display.
- Browser zoom changes the window size — reset zoom to 100% for true readings.
- On phones, rotating between portrait and landscape swaps the numbers.
Frequently Asked Questions (FAQ)
What does the Screen Resolution Tester show?
It shows your screen size in pixels, your browser window size, device pixel ratio, color depth and screen orientation, updated live as you resize the window.
What are screen resolution and viewport size?
Screen resolution is the full pixel size of your display. The viewport is the smaller area inside your browser where a page is shown. Websites use the viewport to lay out content.
Is the Screen Resolution Tester free?
Yes, it is completely free to use with no signup, and everything runs in your browser.
Does it send my screen data anywhere?
No. All readings come from your browser itself with JavaScript, so nothing is sent to any server.