How do I test a screen for dead pixels?

Open the dead pixel test, enter fullscreen mode and cycle through black, white, red, green and blue. A faulty pixel stays fixed in the same position across multiple colors. The test runs locally in your browser.

How accurate is the refresh rate test?

The result is estimated from requestAnimationFrame samples and may be affected by browser or operating-system frame limits. It is useful for a quick check but does not replace dedicated measurement equipment.

Does Screen Detect upload any screen data?

No. The tests run locally in your browser and do not capture or upload the contents of your display.

Runs locally. No screen data is uploaded.

Screen Detect

Check your display for dead pixels, backlight bleed and touch failures. Start in one click and keep every test on your device.

Start screen test

Start with the dead pixel test and inspect black, white, red, green and blue in fullscreen

Viewport —

Device pixel ratio —

Aspect ratio —

01 · PIXEL

Dead pixel test

Use fullscreen solid colors to find bright, dark or stuck pixels

02 · UNIFORMITY

Backlight bleed test

Inspect dark screens for bright edges and uneven lighting

03 · TOUCH

Touch screen test

Trace multiple fingers to find unresponsive areas

More display tests

Gradient test Grid and geometry Refresh rate test Motion and ghosting Burn-in prevention Media queries Safe area test Report Inspection checklist Settings

KNOWLEDGE / Q&A

Common screen-test questions

View all answers

01 What should I do after finding a dead pixel? 02 Are bright screen edges caused by backlight bleed? 03 Why does the refresh rate result fluctuate?