UsefulTab
Dead Pixel Test
Cycle solid colors full-screen to find dead or stuck pixels.
Find dead and stuck pixels
A dead pixel stays black on every color; a stuck pixel is locked on one color and shows the wrong hue. Cycling full-screen solid colors makes both kinds easy to spot against a uniform field. Press Fullscreen, then click or press a key to step through red, green, blue, white, and black. On each solid color, look closely for any dot that is a different color or is dark — that is a stuck or dead pixel. White and black are best for finding always-off and always-on pixels; the primary colors reveal sub-pixels stuck on or off. Enable Auto-cycle to have the colors advance on their own while you watch. Everything runs in your browser and nothing is uploaded. Cleaning the screen first avoids mistaking dust for a bad pixel.
Common questions
How do I check for dead pixels?
Go fullscreen and step through the solid colors. On each one, scan the screen for a dot that is darker than its surroundings or a different color. A dark dot on every color is a dead pixel; a dot stuck on one color is a stuck pixel.
What is the difference between a dead and a stuck pixel?
A dead pixel receives no power and stays black on all colors. A stuck pixel is locked with one or more sub-pixels always on, so it shows a fixed wrong color. Stuck pixels sometimes recover; dead ones usually do not.
Which colors should I test?
Test all of them. Black reveals bright always-on pixels, white reveals always-off (dark) pixels, and red, green, and blue reveal individual sub-pixels stuck on or off.
I found a stuck pixel — can it be fixed?
Sometimes. Gentle massage of the spot, or rapidly flashing colors at that pixel, can occasionally free a stuck pixel. A truly dead pixel (no power) generally cannot be revived and may be covered by warranty depending on the maker's policy.
Is anything uploaded?
No. The solid colors are drawn locally by your browser. Nothing about your screen or the test is stored or sent anywhere.