About the Dead Pixel Test
Fill your screen with solid colors to spot dead pixels (always dark) and stuck pixels (always one color). Use it on a new monitor, laptop, TV or phone, ideally within the return period.
Key features
- Full-screen solid colors
- Black, white, red, green, blue, cyan, magenta, yellow and gray
- Click or use arrow keys to change color
- Auto-cycle every 2 seconds
- Cursor hides so it isn't mistaken for a pixel
- Works on monitors, laptops, TVs and phones
Check a screen for dead and stuck pixels
Click Full screen, then go through each color. Look closely over the whole screen for dots that don't match: a black dot on white or a colored dot on black.
What to look for
| Background | What stands out |
|---|---|
| White | Dead pixels (black dots) |
| Black | Stuck or "hot" pixels (bright colored dots) |
| Red, green, blue | Stuck or dead sub-pixels |
| Gray | Uneven backlight and color tint |
Tips
- Clean the screen first so you don't confuse dust with pixels.
- Set brightness to maximum and view the screen straight on.
- Check from edge to edge, including corners.
- Test new screens immediately: the return window is usually shorter than the warranty.
Related tests
Screen resolution, refresh rate test, and webcam test.
How to use the Dead Pixel Test
- Open the test. It's ready immediately, with nothing to install.
- Follow the on-screen prompt: click, type, press or watch as instructed.
- Read your results, which update live as you test.
- Repeat as often as you like. Results stay in your browser.