Dead & stuck pixels
Nine pure colors, edge to edge. A dead pixel stays black, a stuck one stays lit.
1 minGuide
Stuck Pixel Fixer
A movable patch of rapid color noise to wake up a stuck pixel. 100% in your browser - nothing is uploaded.
10-20 min2 patterns
Flashing, starts only on click
Click the preview to run it full screen
Your display
Updates when you move the window to another screen- Resolution
- ---
- device px
- Pixel ratio
- ---
- devicePixelRatio
- Refresh rate
- ---
- measured in this browser
- Color gamut
- ---
- reported by the browser
- HDR
- ---
- standard range
- Orientation
- ---
- current
How to run the stuck pixel fixer
01Find the pixel
Look for it on black in the dead pixel test: a lit dot where everything should be dark.
02Drag the patch onto it
Start the fixer, read the flashing warning, then drag the patch over the pixel.
03Let it run
Leave it for 10 to 20 minutes. The timer in the controls counts for you.
04Check on black
Stop and look at the spot on black in the dead pixel test.
05Repeat if needed
Still there? Give it one or two more runs before you give up on it.
What to look for
- Only use it on a stuck pixel: one that shows a color (red, green, blue, white) on black.
- The patch must fully cover the pixel. Use the L size if you are not sure of the exact spot.
- After a run, check the pixel on black and on its own color.
What counts as a defect
- A pixel that stays lit after several long runs is a hardware fault the fixer cannot reach.
- A dead pixel (black on every color) has no power at all. Flashing will not revive it.
- Fixed pixels can come back. If it returns within days, treat it as a defect for the return.
What to do next
- Fixed: check again in a day or two, then enjoy the screen.
- Not fixed: mark it in the dead pixel test and save the report as evidence for a return or RMA.
- Avoid pressing on the panel. Massage methods found online can create new dead pixels and damage coatings.
Other screen tests
Each one checks a different part of the panel. The guided check runs them all in order.
Uniformity & clouding
Flat greys and white show clouding, dirty-screen effect and tinted zones.
1 minGuide
Banding & gradients
256 equal steps per ramp. A good panel shows them evenly, a weak one clumps them.
1 minGuide
Sharpness & geometry
One-pixel grids, checkerboards and circles expose scaling blur and bad geometry.
1 minGuide
Refresh rate & tearing
Measures the real frame rate in this browser and shows tearing on a moving bar.
30 sGuide
About the stuck pixel fixer
A stuck pixel has a subpixel that no longer switches off. Flashing it through every color many times a second is the standard first attempt to free it. The fixer is a small patch you drag over the pixel, so the rest of the screen stays dark and calm; full-screen noise is there only if you cannot find the spot.
It is one of the tests in the Screen & Monitor Test, which also runs a guided check through every test and ends in an inspection reportfor a return or RMA. Every pattern is drawn on your screen's own pixel grid, 100% in your browser - no upload, no install, no account needed.
Frequently Asked Questions
Sometimes. It helps most with pixels that got stuck recently, and it cannot hurt a healthy panel. It will not fix a dead pixel or a broken transistor. Give it several 10 to 20 minute runs before you decide.
Only the pixels under the patch need to flash. A small patch is much easier on the eyes and on anyone sensitive to flashing light, and you can keep it running while you step away. Full-screen noise stays available when you cannot tell where the pixel is.
Yes. The patch changes color every frame, so nothing stays static long enough to cause retention. Keep the rest of the screen dark and do not leave it running for hours.
Safari on iPhone does not allow web pages to go truly full screen. The test fills the whole visible area and hides all controls instead; rotate to landscape, or add the page to your Home Screen, to get the most of the panel in view. iPad and Android support real full screen.
No. Every pattern is drawn locally in your browser, and the inspection report is built and downloaded on your device. Nothing about your screen or your results leaves the browser, and no account is needed.
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