How many dead pixels are acceptable?

Manufacturers vary; check your screen's warranty terms.

How do I exit fullscreen?

Press Esc or click the X button.

Why is there a faint color tint?

Usually calibration, not defect. Run a monitor calibration.

Δοκιμή Νεκρών Pixel

Πλήρης οθόνη με συμπαγή χρώματα για ανίχνευση νεκρών, κολλημένων ή καυτών pixel.

Φορτώνει άμεσα

Clean the screen first: smudges look like dead pixels
Dim room lights for best contrast
Sit close enough to inspect individual pixels (12–18 inches)
Test soon after purchase to qualify for warranty replacement

Πώς να Χρησιμοποιήσετε

Go Fullscreen

Click Start to enter fullscreen color mode.

Inspect Each Color

Click or use arrow keys to cycle colors.

Look Closely

Stuck pixels show wrong color; dead pixels stay black.

Troubleshooting

Browser may block fullscreen: click 'Allow' on the prompt
Try a different browser
Disable browser extensions that interfere

Χαρακτηριστικά

8 Test Colors

Red, Green, Blue, White, Black, Cyan, Magenta, Yellow.

Fullscreen Mode

Fills the entire viewport.

Keyboard Shortcuts

Arrow keys cycle, Esc exits.

Mobile-Friendly

Tap to cycle on phones.

Πλήρης Οδηγός

What Are Dead, Stuck, and Hot Pixels?

A dead pixel is permanently off (black) regardless of what the surrounding image displays. It cannot reproduce any color. Dead pixels are caused by transistor failure in the sub-pixel: the silicon component that controls light output has stopped functioning. A stuck pixel is permanently on in one color (red, green, or blue). Unlike a dead pixel, the transistor still works but the liquid crystal is stuck in one position. Stuck pixels are sometimes recoverable using rapid color cycling, which our Stuck Pixel Fixer tool implements. A hot pixel is permanently displaying white: all three sub-pixels are stuck on. Hot pixels are much rarer than stuck pixels. All three defects are most visible against solid color backgrounds. Against a black screen, dead pixels are invisible but stuck pixels glow bright. Against white, dead pixels appear as black specks. Cycling through 8 standard colors reveals every type of defect.

How to Run the Dead Pixel Test

Click Start to enter fullscreen. The first color (red) fills the entire screen. Inspect carefully: any pixel that's not red is a defect. Stuck blue pixels stand out as bright blue dots against the red. Click anywhere or press the right arrow key to advance to the next color. Cycle through all 8: red, green, blue, white, black, cyan, magenta, yellow. Each reveals different types of defects. For best results: dim the room, sit 12–18 inches from the screen, and clean the screen first (dust looks like defects). Use the black screen to find stuck-on pixels, white screen to find dead pixels, and primary colors to find single sub-pixel issues. Press Escape or the X button to exit fullscreen at any time.

Can Dead Pixels Be Fixed?

Dead pixels are permanent: the transistor is broken and no software can fix it. Replacement of the screen is the only solution. Stuck pixels are sometimes recoverable using rapid color cycling (try our Stuck Pixel Fixer tool). The theory is that rapid switching may unstick the liquid crystal. Success rates vary; some users report 30–50% success on stuck pixels. Gentle pressure with a soft cloth while the pixel is flashing colors is an old trick that occasionally works. Apply minimal pressure to avoid damaging the LCD. Wrap the cloth around a pen cap or eraser for focused pressure. Heat methods (warming the screen with a hair dryer) sometimes work for liquid crystal issues but risk damaging other components. Not recommended. If the pixel doesn't recover after multiple long runs of color cycling, it likely won't recover. Time to consider warranty replacement.

When to Claim a Manufacturer Warranty

Most monitor and laptop manufacturers warranty against more than a specified number of dead pixels. The threshold varies: some accept 1 dead pixel, others require 3, 5, or 8 before replacement is offered. Check your manufacturer's specific policy before complaining. Apple, Dell, HP, Lenovo, ASUS, and Samsung all publish dead pixel policies, and they vary by product line. Run this test on a new screen within the return window. Photograph any defects with a macro lens or smartphone camera. Document the defect count and color for warranty claims. Some retailers offer 'zero dead pixel' guarantees for additional cost. These are worth it for high-end displays where even one dead pixel ruins the experience. For screens already out of warranty, your options are: live with the defect, attempt repair with the stuck pixel fixer, or replace the screen at your own cost.

Why Solid Colors Reveal Pixel Defects

Surrounded by identical pixels, a single defective pixel becomes immediately obvious. The human visual system is tuned to detect anomalies in uniform fields: a black dot in a sea of red jumps out instantly. In normal use, photos and websites have so many different colors that defects blend in. A dead pixel in the middle of a complex image is nearly invisible. The same pixel against a solid white background is glaring. This is also why pixel defects bother some users more than others. Anyone who spends time on solid-color UI elements (light or dark mode interfaces) notices defects more. Users who mostly view content (videos, photos) often don't notice the same defects. Some users develop 'pixel blindness': once a defect is noticed, it dominates attention; once forgotten about, it disappears from awareness. The best strategy after discovering a defect is to either replace the screen immediately or commit to ignoring it.

Συμβατότητα

Λειτουργεί σε όλες τις βασικές πλατφόρμες και browsers

Συσκευή / Λειτουργικό	Chrome	Firefox	Safari	Edge
Windows 10/11	✅	✅	:	✅
macOS Ventura+	✅	✅	✅	✅
Android 8+	✅	✅	:	✅
iPhone / iPad (iOS 14+)	✅	:	✅	:
Chromebook	✅	:	:	:
Linux (Ubuntu)	✅	✅	:	✅

Συχνές Ερωτήσεις

No: dead pixels are unrecoverable. Try the Stuck Pixel Fixer for stuck pixels.

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