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.