Dead Pixel Test
Fill the screen with five solid colors to spot dead, stuck and hot pixels.
Stuck Pixel Fixer
The Stuck Pixel Fixer tries to free a pixel stuck on one color by flashing random colors over your screen, about 30 times a second, for a timed run. It cannot repair a dead pixel that stays black.
Flashing light warning
This pattern flashes rapidly across the whole screen. Do not use it if you are sensitive to flashing lights or have a history of photosensitive seizures.
Showing Ready
Runs entirely in your browser. Test results, audio and video never leave your device.
How to fix a stuck pixel
- Confirm with the Dead Pixel Test that the pixel is stuck, not dead. A stuck or hot pixel is lit on the black screen; a dead one stays black on every color.
- Restart the device, or switch the monitor off and on again, and check the pixel once more.
- Read the Flashing light warning and tick I understand and want to continue. Start stays disabled until you do.
- Choose a Duration from 5 min to 1 hr (10 min is the default), then press Start or click the test area. The pattern fills the screen.
- Leave it running until the timer ends. You can Pause or Stop at any time. Esc or Exit pauses the run until you press Resume, and the timer does not count while the tab is hidden.
- When the Finished notice appears, check the pixel again. If it is still stuck, run it again now or on another day. If several runs change nothing, contact the seller or manufacturer, and see how to document a pixel fault.
Can dead pixels be fixed?
A dead pixel cannot be fixed by software, because it is a hardware fault in the panel; only replacing the panel, under warranty or at a repair shop, removes it. A dot that shows a color or white instead of black is a stuck or hot pixel, not a dead one, and a fixer pattern sometimes frees it.
Do stuck pixel fixers work?
Sometimes. A stuck pixel stays lit because one or more of its subpixels no longer respond to the signal. A fixer changes every pixel's color many times a second, and some people report that a stuck subpixel starts responding again after one run or several. The evidence is anecdotal: there is no reliable figure for how often it works, and a pixel that clears after a run might have cleared on its own.
Which stuck pixel fixes are safe?
Switching the screen off and running a fixer pattern are safe for the panel. Pressing and heating are not: both can damage the screen, and neither is needed to try a fix.
| Method | What it involves | Risk |
|---|---|---|
| Switching it off | Restarting the device, or turning the monitor off for a while | None |
| A fixer pattern | Rapidly changing colors over the pixel for a timed run, as on this page | None to the screen. The flashing can affect people sensitive to flashing light. |
| Pressing or rubbing | Pushing or rubbing on the spot, often through a cloth | Can damage more pixels, leave pressure marks or crack the panel |
| Heating | A warm, damp cloth or other heat on the spot | Heat and moisture can damage the panel and the electronics behind it |
| Replacing the panel | Done by the manufacturer under warranty, or by a repair shop | None. It is also the only fix for a dead pixel. |
What the fixer can and cannot help with
- Stuck pixels: a dot that stays red, green, blue or another single color may return to normal after one or more runs.
- Hot pixels: a dot that stays bright white on black may respond the same way.
- Dead pixels: a dot that stays black on every color will not respond.
- Lines, cracks and patches: damage from pressure or a drop, and uneven brightness, are not stuck pixels, and the pattern does not affect them. The Screen Uniformity Test shows patches.
How it works
The page fills a full-screen canvas with random noise. Each cell, about 2 × 2 device pixels, gets a random color, so every red, green and blue subpixel is driven through many brightness levels rather than simply on and off. The noise is redrawn about 30 times a second.
The timer counts only while a run is active and the pattern fills the screen. Each animation frame adds at most 100 ms, so a hidden tab stops the clock. Where the browser has the Screen Wake Lock API, the page asks it to keep the screen from dimming or sleeping while the pattern runs, and releases the lock on Pause, Stop, exit or when the timer ends.
Limitations
- The pattern flashes rapidly across the whole screen. Do not use it if you are sensitive to flashing lights or have a history of photosensitive seizures. Reduced motion settings do not change it.
- The fixer cannot tell whether the pixel has recovered. Check it yourself after each run.
- It covers the whole screen, or the browser window where fullscreen is not available. There is no small window to place over one pixel, so you cannot use that screen for anything else during a run.
Frequently asked questions
How long should I run a stuck pixel fixer?
No run length is known to work better than another. Start with the default 10 min, then check the pixel. If it is still stuck, run it again or choose 30 min or 1 hr, and try again on other days. If several attempts change nothing, the pixel is unlikely to respond.
Can a stuck pixel fix itself?
Sometimes. Some stuck pixels clear after the screen has been off for a while or after days of normal use, and others never do. There is no way to tell in advance which kind you have.
Can I use it on a phone, an OLED screen or a TV?
Yes. It runs on any screen that can show this page, LCD or OLED. On a TV, open the page in the TV's browser or show it from a laptop connected over HDMI. On iPhone, where the browser cannot go fullscreen, the pattern fills only the browser window, so a pixel under the status bar or toolbar may not be covered.