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Screen Resolution Tester
Detect your current screen size, browser window dimensions, DPR, color depth, orientation, and retina status.
screen resolutionwhat is my screen resolutiondisplay resolution checkerscreen size test
Live device check
Current screen and browser window details
Screen resolution
0 × 0
Browser window size
0 × 0
Device pixel ratio
1
Effective resolution
0 × 0
Color depth
0-bit
Orientation
Landscape
Aspect ratio preview
16:9
1920 × 1080
Common resolution reference
Popular display targets| Label | Resolution | Aspect ratio | Typical use |
|---|---|---|---|
| HD | 1280 × 720 | 16:9 | Streaming, video calls |
| Full HD / 1080p | 1920 × 1080 | 16:9 | Laptops, monitors, TVs |
| QHD / 1440p | 2560 × 1440 | 16:9 | Gaming and creator displays |
| Ultrawide | 3440 × 1440 | 21:9 | Multi-window productivity |
| 4K UHD | 3840 × 2160 | 16:9 | High-detail video and design work |
| 5K | 5120 × 2880 | 16:9 | High-density Retina-class panels |
How to use
How to check your screen resolution, browser size, and pixel density in real time
- 1 Open the page on the device you want to inspect so the tool can read your current screen and browser values directly.
- 2 Resize the browser window to see the window-size numbers update instantly as the viewport changes.
- 3 Check the device pixel ratio and effective resolution to understand how CSS pixels map to physical display pixels.
- 4 Look at the orientation and aspect-ratio preview if you need to confirm whether the device is acting like a portrait or landscape display.
- 5 Compare your current numbers with the reference table for 1080p, 1440p, ultrawide, and 4K targets.
A screen resolution tester is helpful when you are debugging responsive layouts, checking design breakpoints, preparing screenshots, or confirming what a display is reporting to the browser. Screen size, browser window size, and device pixel ratio are related but not identical values, so having them all together makes it easier to understand how a page is really being rendered on a given device.
The Retina indicator is especially useful on higher-density laptops, phones, and tablets where the effective pixel count is higher than the CSS pixel grid. Designers and front-end developers often need that information when preparing sharper images, testing zoom behavior, or reviewing how interfaces scale across screens. Because the tool listens for resize events, it works as a live monitor instead of a one-time lookup.
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