How do I use the Screen Resolution Tester?

Open the tool on the device or monitor you want to measure. Read the detected screen resolution, viewport size, device pixel ratio, orientation, and related display details. Use the measurements to test responsive layouts, verify retina behavior, or troubleshoot display scaling issues.

Is the Screen Resolution Tester free?

Yes, the Screen Resolution Tester is completely free. It runs entirely in your browser with no signup, no download, and no data sent to any server.

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Screen Resolution Tester

Detect your current screen size, browser window dimensions, DPR, color depth, orientation, and retina status.

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Live device check

Current screen and browser window details

Retina display: Yes

Screen resolution

0 × 0

Browser window size

0 × 0

Device pixel ratio

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 Use the Screen Resolution Tester

1 Open the tool on the device or monitor you want to measure.
2 Read the detected screen resolution, viewport size, device pixel ratio, orientation, and related display details.
3 Use the measurements to test responsive layouts, verify retina behavior, or troubleshoot display scaling issues.

The Screen Resolution Tester shows your current display size, browser viewport, DPR, and other device characteristics in one place. It is a useful screen size test for designers, developers, and support teams working on responsive websites.

If you need to answer what is my screen resolution or check display resolution and pixel ratio on desktop or mobile, this tool provides instant browser based detection with no setup required.

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