Dead pixel test
Click the field to run a full-screen dead pixel test and stuck pixel test, then click or press Space to cycle black, white, red, green, blue, and gray.
Dead pixel test workspace
How to use
4 short steps.
Clean the screen first
Turn the display off for a moment and wipe it gently. A speck of dust looks exactly like a dead pixel.
Click the field to go full screen
The screen fills with black. Click, tap, swipe, or press Space to move to white, red, green, blue, and gray.
Scan the whole screen on each color
Look for a point that does not change with the rest of the screen. Move closer to any spot you are unsure about.
Note where the point is and what it does
A point that stays black is dead. A point that stays white or one color is stuck. Press Escape to leave full screen.
What the result means
Match what you see to one of these.
If a point stays black on every color, the pixel is dead
If the same point is dark on white, red, green, and blue, the pixel is not lighting up. A fixer cannot help a dead pixel.
If a point stays lit in one color, the pixel is stuck
If a point stays red, green, blue, or white while the field changes, one subpixel is stuck on. The stuck pixel fixer is worth a try.
If the mark is larger than a dot, it is probably not a pixel
If the mark has soft edges or covers several pixels, it is more likely dust, pressure damage, or a uniformity problem.
Troubleshooting
If the test fails, try these in order.
Clean the spot and look again
Wipe the exact spot with a dry microfiber cloth and check it again on white and black.
Change your viewing angle
Reflections and dust change with angle; a pixel fault does not. Look at the spot from the side and run the colors again.
Restart the display and the computer
Power the display off for a minute, restart, and run the test again. A stuck subpixel sometimes clears on its own.
Try the stuck pixel fixer
If the point stays lit in one color, run the fixer over it for 10 minutes, then come back here and check the same spot.
What this test can't tell you
Where a browser check stops.
- The page cannot see your screen, so it cannot find or count faulty pixels for you.
- With display scaling active, one CSS pixel is not one physical pixel, so the exact position of a fault is approximate.
- One or two faulty pixels are within many manufacturers' warranty limits; check the maker's pixel policy before claiming.
FAQ
Common questions about this test.
How do I check for dead pixels?
Clean the screen, click the field on this page to go full screen, and cycle black, white, red, green, and blue. A point that stays black on every color is dead; a point that stays one color is stuck.
What is the difference between a dead pixel and a stuck pixel?
A dead pixel gets no power and stays black. A stuck pixel has one subpixel stuck on, so it shows red, green, blue, or white. Stuck pixels sometimes recover; dead pixels do not.
How do I test an iPhone or Android phone for dead pixels?
Open this page on the phone, tap the field, and swipe or tap to change colors. On iPhone, Safari keeps its bar visible because it does not allow full screen for pages, so check the area behind the bar by scrolling it away.
How do I test a TV for dead pixels?
Open this page in the TV's browser, or cast a browser tab from your phone or laptop. Many TVs also have a solid-color test pattern in the picture menu that does the same job.
Can a dead pixel be fixed?
A truly dead pixel cannot be fixed by software. A stuck pixel sometimes recovers after rapid color changes; the stuck pixel fixer runs that exercise.