Worried about your new monitor? Use our free, easy-to-use dead pixel test to quickly check any screen for dead, stuck, or hot pixels. No installation needed.
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Understanding the Dead Pixel Test
A dead pixel test is the most fundamental and important check for any new or used monitor. Pixel defects can be distracting and are often covered by manufacturer warranties. Our tool makes it easy to find these issues without any software installation.
What Are You Looking For?
When you run the dead pixel test, you are looking for any pixel that behaves abnormally. There are three main types of pixel defects:
- Dead Pixels: These are pixels where all three sub-pixels (red, green, and blue) are permanently off. They appear as a small black square and are the easiest to spot on a white or bright-colored background.
- Stuck Pixels: This occurs when one or two sub-pixels are permanently on. This results in a pixel that is stuck on a single color - red, green, blue, cyan, magenta, or yellow. A stuck pixel is best found by cycling through all the solid colors in our test.
- Hot Pixels: This is when all sub-pixels are permanently on, making the pixel always appear white. A hot pixel is most noticeable during the black screen portion of the dead pixel test.
Frequently Asked Questions (FAQ)
Do I need to install any software?
No. ScreenTestPro is a 100% web-based diagnostic tool. It runs safely in your browser (Chrome, Safari, Firefox, Edge) and works on Windows, macOS, Android, and iOS.
Can this tool fix dead pixels?
Our
Dead Pixel Test includes a 'Fixer' feature. It uses rapid color flashing to attempt to unstick 'stuck pixels'. However, black 'dead' pixels are usually permanent hardware failures.
What other screen tests are available?
What is the best way to run a dead pixel test?
For the best results, clean your screen first to ensure you're not mistaking dust for a dead pixel. Then, run the test in a dimly lit room and view the screen from your normal viewing distance. Cycle through all the colors and carefully inspect the entire surface area of your monitor.
Can dead pixels be fixed?
True dead pixels (always black) are usually a hardware failure and cannot be fixed. However, stuck pixels (stuck on one color) can sometimes be fixed using software that rapidly flashes colors on the screen, or by applying gentle pressure to the area. Many online tools offer 'stuck pixel fixer' videos or apps.
How many dead pixels are acceptable?
This depends on the manufacturer's warranty policy, which is often based on the ISO 13406-2 standard. Policies vary, but many manufacturers will replace a monitor if it has even one dead pixel in the center of the screen, or several dead/stuck pixels across the display. Always check your specific monitor's warranty.
