Dead Pixel Test Free Online Test For All Screens
If there is a dot on your screen that no longer lights up, leaving a permanent dark mark on the image, you may have a dead pixel. Click any colour below to open our dead pixel test. It will fill your entire screen so you can perform a dead-pixel check on your device. Look for spots that do not match. A dead pixel will always be black, while a stuck pixel will remain lit in one of its colors and may sometimes be fixable. Our dead pixel test is free, runs directly in your browser, and takes about a minute.
Full-Screen Display Pixel Inspector
Launches the diagnostic test in true edge-to-edge fullscreen to scan corners and borders without browser bars interfering.
What is a Pixel?
All screens are made of a large number of tiny dots that turn on or off to show a particular colour. These dots are called pixels. A macro view of a computer screen shows the individual pixels that combine to create the image you see. Each pixel is made of three sub-pixels that display red, green, and blue at varying intensities.
Figure 1: Close-up microscopic view of standard RGB subpixel arrangement forming individual digital display pixels.
What is a Dead Pixel?
Sometimes pixels malfunction. A dead pixel receives no power and never lights up, leaving a permanent black dot on your monitor, laptop, TV, tablet, or phone screen.
What Does a Dead Pixel Look Like?
Recognizing a dead pixel on your screen involves looking for several distinct visual characteristics:
- Solid Black Dot: A dead pixel normally appears as a small solid black dot because none of its RGB subpixels receive electrical current.
- Static Across Backgrounds: It remains permanently black regardless of what image, application, or background color is displayed.
- High Contrast on Bright Colors: It is easiest to identify when displaying pure, bright solid background colors like White, Yellow, Cyan, Red, or Green.
- Occurs on All Screen Types: Dead pixels can occur on desktop computer monitors, laptop displays, smartphones, tablets, TVs, and external field screens.
Figure 2: Isolated black dead pixel visible against an active illuminated screen background.
How to Test Your Screen?
A full dead pixel test takes under two minutes. Follow these five simple steps:
Clean your screen
Dust and smudges can sometimes be mistaken for a dead pixel. Gently wipe the panel with a clean microfiber cloth before beginning.
Set brightness to maximum
Stuck sub-pixels and other display defects are easier to spot when your monitor or mobile screen operates at full brightness.
Pick a colour above
Clicking any color button launches the test in edge-to-edge fullscreen. Use your keyboard's arrow keys, spacebar, or single-tap on touchscreens to cycle through colors.
Check the entire screen
Carefully inspect the center, borders, and all four corners for any microscopic dots or specks that do not match the surrounding solid background color.
Compare different colors
If a dot remains black across different backgrounds, it may be a dead pixel. If it remains red, green, blue, or another fixed color, it may be a stuck pixel.
Dead, Stuck, or Hot Pixel?
Pixel defects can appear in different ways. Knowing the difference between a dead pixel, stuck pixel, and hot pixel can help you identify what is wrong with your display.
Dead Pixel
A dead pixel is a solid black or completely dark dot that does not light up when the screen displays different colors. It usually indicates that the pixel has stopped functioning.
Stuck Pixel
A stuck pixel remains permanently lit in one color, commonly red, green, or blue, even when the image on the screen changes. Some stuck pixels may respond to pixel-refresh or color-cycling techniques.
Hot Pixel
A hot pixel is a pixel that remains permanently bright, commonly appearing white or another bright color regardless of what is displayed.
Dead Pixel vs Stuck Pixel vs Hot Pixel
| Type | Appearance | Behavior | Possible Solution |
|---|---|---|---|
| Dead Pixel | Black/dark | Does not light up | Usually requires hardware replacement |
| Stuck Pixel | Red, green, blue, or another fixed color | Remains stuck on one color | May sometimes be recoverable (RGB flashing) |
| Hot Pixel | Bright white or another bright color | Remains permanently lit | Usually requires hardware repair/replacement |
Dead Pixel Test for Smartphones and Tablets
Mobile browsers cannot always fill the screen with a completely flat colour in the same way as desktop displays, so smartphones and tablets can be tested using fullscreen video or color patterns. Open the test at the highest quality available, rotate the device to landscape when appropriate, and carefully watch for pixels that never change.
How to Identify a Dead Pixel?
To accurately detect pixel faults on any screen:
- Display solid black, white, red, green, and blue backgrounds in full-screen mode.
- Inspect the whole screen carefully from top-left to bottom-right.
- Look for a tiny dot that does not match surrounding pixels.
- A permanently black dot may indicate a dead pixel.
- A permanently red, green, or blue dot may indicate a stuck pixel.
- A permanently bright white dot may indicate a hot pixel.
- Clean the display first so dust is not mistaken for a pixel defect.
Dead Pixel or Dust?
Dust, dirt, and smudges on the screen can sometimes look like a pixel defect. Before concluding that your display has a hardware defect:
- Clean the screen carefully.
- Look at the spot from different angles.
- Run the fullscreen color test again.
- Check whether the spot changes with the screen background.
Want to see how viewing angle differentiates surface particles from subpixel defects? Try our interactive Dust Parallax Simulator or review our Screen Inspection Checklist.
Interactive Stuck Pixel Fixer (RGB Strobe Noise)
Rapidly cycles high-frequency primary colors (Red, Green, Blue, White) to stimulate liquid crystal molecules and attempt to unfreeze stuck sub-pixel transistors.
Can a Dead Pixel Be Fixed?
A genuinely dead pixel usually cannot be repaired using software because the underlying pixel or electrical component has failed. Pixel-refresh and color-cycling methods are more relevant to stuck pixels and are not guaranteed to work.
Key repair and warranty facts to keep in mind:
- Warranty coverage depends on the manufacturer: Retail return windows (often 14–30 days) are much more lenient than manufacturer policies.
- Minimum pixel-defect requirements: Most consumer displays operate under ISO 9241-307 Class II standards, requiring 2–5 defective pixels before qualifying for free warranty replacement.
- Professional display replacement: If a dead pixel is located in a critical central viewing area on an expensive screen, professional panel replacement is the practical permanent solution.
If your pixel is frozen on a specific color (red, green, or blue), you can attempt recovery using our dedicated Stuck Pixel Fixer.
Can Dead Pixels Spread?
A dead pixel itself does not normally spread to neighboring pixels. A single failed transistor operates independently on the grid. However, if the display has underlying physical damage (such as a hairline panel crack), electrical damage from a power surge, moisture damage, or manufacturing ribbon cable degradation, additional pixel defects can potentially appear over time across the affected circuit lines.
How to Prevent Dead Pixels?
While factory manufacturing defects cannot always be prevented, following practical handling habits significantly reduces the risk of accidental display damage:
- Avoid excessive pressure: Never poke, press, or lean against delicate LCD/OLED panels.
- Protect from drops and impacts: Use protective cases and padded sleeves for laptops and tablets.
- Keep away from extreme heat: Do not leave portable electronics inside hot parked cars or near radiators.
- Keep away from moisture: Avoid high-humidity environments and prevent liquids from contacting bezels.
- Clean screens gently: Use a clean microfiber cloth without harsh abrasive chemicals or excessive force.
- Handle laptops carefully: Close lids softly to prevent keycaps from pressing into the screen.
- Avoid placing heavy objects on screens: Never store books or equipment on top of closed laptop lids.
Conclusion
Dead pixels are usually visible as permanent black dots, while stuck pixels remain fixed on a particular color and hot pixels remain permanently bright. A proper fullscreen test using different colors is one of the easiest ways to identify these display defects.
If you notice an unusual spot on your screen, clean the display first and then run a dead pixel test. Testing different colors can help determine whether the problem is a dead pixel, stuck pixel, hot pixel, or simply dust on the screen.
Frequently Asked Questions
A dead pixel is a pixel that has stopped functioning and usually appears as a small black or completely dark dot on the screen.
Dead pixels can result from manufacturing defects, physical damage, electrical failures, excessive heat, moisture, or long-term display wear.
Display fullscreen solid colors such as black, white, red, green, and blue and look for pixels that do not match the surrounding screen.
A dead pixel is usually black and does not light up, while a stuck pixel remains fixed on a particular color such as red, green, or blue.
A hot pixel is a pixel that remains permanently bright, often appearing white regardless of the image displayed.
A genuinely dead pixel usually cannot be repaired with software. A stuck pixel may sometimes respond to color-cycling or pixel-refresh methods.
A dead pixel itself does not normally spread, although additional defects may appear if there is underlying physical or electrical damage to the display.
Yes. Dust or dirt on the screen can sometimes look like a tiny pixel defect. Cleaning the screen before testing can help avoid confusion.
Warranty policies vary by manufacturer. Some manufacturers allow a certain number of defective pixels before offering replacement or repair.
Yes. Smartphones and tablets can be checked using fullscreen color patterns or video-based testing methods.