How to use it
Follow the on-screen instructions several times and compare repeated attempts rather than one score.
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Monitor & device
Dead Pixel & Retention Test
Cycle full-screen solid colors to inspect pixels and image retention.
Red
Green
Blue
White
Black
Gray
Clean the display, set a comfortable brightness and look for odd pixels or image retention.
TOOL GUIDE
When to use it
Content reviewed · 2026-07-22
Cycle full-screen solid colors to inspect pixels and image retention.
Before you rely on the result
Results can vary with the browser, operating system, display, and input device.
Data handling
Values are used only on the current screen and are not sent or stored separately.
Related tools
A few tools that fit naturally with this task.