Dead Pixel Test 🖥️ Free Dead Pixel Check

A dead pixel is a defective or malfunctioning pixel that does not display as expected on a screen. DeadPixelTest.org provides you with the simplest way to perform a dead pixel test and check if you have any dead pixel, bad pixel or stuck pixel on your monitor. Checking your screen is completely free! To run a free dead pixel check and inspect your screen, follow these three simple steps:

1. Clean your computer screen 🖥️

Make sure your screen is almost perfectly clean and does not have any dust or dirt that you may mistake for a dead pixel.

2. Launch our dead pixel test 🚀

Our dead pixel test will open in a new window and prompt you to go full screen. You'll be able to run through several colors by clicking on the screen or using your arrows.

3. Carefully inspect your screen for dead pixels 🕵🏻

If any dot on your screen is not displaying the color that the rest of your screen is showing, this could be a dead pixel or a stuck pixel. 

Dead Pixel Test
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What is a pixel?

All screens are made of a large number of dots that turn on or off, and can show a particular colors. Simply put, these dots are pixels. This image shows you a macro shot of a computer screen on which you can see the individual pixels constituting the image. Each pixel is constituted of three sub-pixels that show red, blue or green with various intensities to make the colors appear.

A macro image of a computer screen showing sub-pixels

What is a dead pixel?

An image of a dead pixel on a screen

Sometimes, pixels can be malfunctioning. A dead pixel is a pixel that does not turn on when needed, resulting in a permanent black dot your screen. It should look like the black dot on this image.

    What is the difference between dead pixels and stuck pixels?

    There is a difference between dead pixels and stuck pixels. Some malfunctioning pixels can be stuck to a particular color. This can be due to one or several of their sub-pixels to be blocked on a specific color. Depending on the condition of its sub-pixels, a stuck pixel may display the right color on some pictures, but can appear as an odd bright spot on some others. For instance, if the green sub-pixel is stuck to 100%, a white full screen image will display correctly, but you should see a green dot when displaying a black image. You may have better chances at attempting to fix a stuck pixel than a dead pixel.

      An image of a green stuck pixel on a screen

      I have dead pixels on my screen, what can I do?

      If you find one or a couple dead pixels on your screens after performing your dead pixel test, there are a few things that you might want to try:

      1. Check the warranty and contact the manufacturer and/or the seller. Depending on how old your screen or device is, and the warranty conditions of the organisation. You might be able to get your screen replaced if you have a dead pixel or a stuck pixel on it.
      2. Attempt a dead pixel fix. On DeadPixelTest.org, we have built a dead pixel fix tool that will display changing colors on your screen at a very high refresh rate to attempt to revive your dead or stuck pixels.
      Dead Pixel Fix
      for Computers      Dead Pixel Fix for
      Smartphones

      Check our or other screen tests

      DeadPixelTest.org and its affiliate websites offer you other screen tests to make sure your display works well. You may find them below.

      Frame Rate and Motion Blur Test

      FrameRateTest.org helps you see your screen's refresh rate, which is how many times per second the image is updated. A higher refresh rate, like 120Hz or more, makes motion look much smoother, which is great for gaming and watching videos. This test also checks for motion blur, which is when moving objects on your screen look blurry. By running this test, you can make sure your display is performing as it should for a clear and smooth picture.

      Test your Frame Rate

      Backlight Bleed Test

      With BacklightBleedTest.org, you can check for something called backlight bleed. This usually happens on LCD screens when the light from the back of the screen leaks around the edges, causing bright spots or patches, especially when the screen is showing dark images. This test displays a black screen so you can easily spot any uneven lighting. It's a quick way to see if your monitor or TV has this common issue.

      Backlight Bleed Test

      Screen Resolution Test

      DeadPixelTest.org's screen resolution test is a simple tool to find out the resolution of your screen. Your screen's resolution is the number of pixels it can show, like 1920x1080 (Full HD) or 3840x2160 (4K). Knowing your resolution is important for getting the best picture quality and making sure your computer or other devices are set up correctly. This test instantly tells you your screen's native resolution and many other useful information about your display.

      Test your Screen Resolution

      Screen Contrast Test

      You can use DeadPixelTest.org's screen contrast test to see how well your screen shows the difference between black and white. Good contrast means you can see all the details in both very dark and very bright parts of an image at the same time. This test shows a pattern of black and white gradients to help you adjust your screen's contrast settings for the best possible image quality, so you don't miss any details.

      Test your Screen Contrast