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Screen Resolution Tester

See your screen resolution, pixel ratio and window size live.

How to use

  1. Open the page - your resolution shows immediately.
  2. Resize the window to watch the numbers update live.
  3. Copy the summary for bug reports or support tickets.

Frequently asked questions

Why does my 4K screen show 1920×1080?

Browsers report CSS pixels. With 200% display scaling the pixel ratio is 2 - multiply to get the physical 3840×2160 panel.

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