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Dead Pixel Test
Fill the screen with solid colors. A dead pixel stays black. A stuck pixel stays lit.
Advance automatically
Click, space, or the arrow keys change color. Escape closes the test.
Black
The color field opens over the page and stays inside this test.
More tests
What it measures
Fields
Black, white, red, green, blue, cyan, magenta, yellow, and gray.
Cycle
An optional automatic change so you can watch the panel instead of the mouse.
Questions
What is a dead pixel?
A dot that stays black on every color. A stuck pixel stays lit in one color. Both show up against a full-screen field.
How do I leave the test?
Press Escape, or click the screen if you are not in automatic mode and want the next color. Escape always closes it.