Dead Pixel Test
Cycle through solid colors full-screen to spot pixels that don't match everything around them.
Click or press the arrow keys to move between colors. Press Escape to exit at any time.
Dead pixel vs. stuck pixel — what’s the difference?
A dead pixel is permanently off — it shows up as a black dot no matter what color the rest of the screen is displaying. A stuck pixel is different: it’s frozen showing a single color (often red, green, or blue) instead of changing with the image behind it. Stuck pixels can sometimes be fixed; dead pixels generally can’t.
How to run the test properly
Clean your screen first — a speck of dust or a smudge is very easy to mistake for a stuck pixel. Dim the room if you can, since a dark room makes both dead and stuck pixels much easier to spot, especially against the black and white screens. Step through each color slowly and look closely, ideally from a few different angles.
If you find one
Many manufacturers replace a screen with even a single dead pixel within the warranty period, though policies vary — some only cover a certain number of pixels or a specific screen region. Check your warranty terms before attempting anything else. Gently massaging a stuck pixel is a commonly suggested fix, but it carries a real risk of damaging the screen if done with too much pressure — approach it carefully, and know that it doesn’t always work.
Frequently asked questions
Why does the test go full-screen?
A dead or stuck pixel is often just one dot among millions — full-screen solid colors remove every other visual distraction so a single mismatched pixel actually stands out.
Can this test damage my screen?
No. It only displays solid colors, the same as any other image or video your screen already shows.
Does this work on phones and tablets?
Yes — open this page in your phone or tablet's browser and run the test the same way. Full-screen mode may behave slightly differently depending on your browser.
I see a colored dot only sometimes — is that still a stuck pixel?
Possibly. If it appears in the same physical spot on screen regardless of what's actually being displayed there, that's consistent with a stuck or dead pixel rather than something in the image itself.