How to use it
Follow the on-screen instructions several times and compare repeated attempts rather than one score.
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 · 2026-07-24
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.
Tests & devices
Keyboard N-Key Test
Check every key, maximum simultaneous input and keyboard ghosting.
Tests & devices
Mouse Click, Wheel & Double-Click Test
Check left, middle and right clicks, wheel direction and browser double-click events. Not a hardware fault diagnosis.
Tests & devices
Reaction Time Test
Click when the screen changes color and measure your reaction time in milliseconds.