Why a dead pixel test matters -
You might think a single dead pixel isn’t a big deal, but its impact depends largely on where it’s located. A dead pixel in the center of your screen can quickly become an eyesore and a constant annoyance. Over time, multiple dead pixels can reduce the overall quality of your display and even signal underlying hardware problems.

Dead pixel tests help you spot these flaws early so you can take action before things get worse. Whether you're under warranty or considering a screen replacement, having test results makes it easier to explain the issue to customer support or technicians. It’s also helpful for people buying or selling used electronics, as it verifies screen quality.

How a dead pixel test works

A dead pixel test typically involves displaying solid colors across the screen—red, green, blue, white, and black. By switching the screen to these full-color backgrounds, it becomes easier to see which pixels aren’t functioning properly.

There are three main ways to perform the test:

Online dead pixel tests
These browser-based tools allow you to test your screen without installing any software. Just visit the website, follow the instructions, and your screen will cycle through different colors. You inspect the screen during each color display to spot dead or stuck pixels. It's fast, easy, and requires no technical expertise.

Dead pixel test software
For a more detailed analysis, you can download a dead pixel test application. These programs often include additional features like automatic pixel tracking, repair attempts for stuck pixels, and options to test multiple displays. They’re ideal for people who frequently check screens or work in tech repair.

Manual testing
If you prefer a hands-on approach, you can create your own test using solid-color image files or display settings. Simply set your screen to show one color at a time and inspect it closely. This method is effective but requires a bit more patience and attention to detail.

Signs you need a dead pixel test

Dead pixels aren’t always obvious right away. In fact, some users may go weeks or months before realizing there’s something wrong with their display. Here are a few signs that it's time to run a dead pixel test:

You notice a small black dot that never goes away

A pixel appears stuck on one color regardless of the content shown

Your screen looks patchy or uneven in certain areas

You see clusters of oddly colored or blank spots

Even if your screen appears fine, it’s a good idea to run a dead pixel test periodically—especially if your device is new or you’re preparing to sell it.