Dead Pixel Test
A free dead pixel test you can run in any browser. It cycles your screen through white, black, red, green, and blue at full screen so defects have nowhere to hide: a dead pixel stays black on every color, while a stuck pixel stays lit on one. Inspect a new phone, laptop, monitor, or TV before the return window closes.
What you can use it for
- Check a new monitor, laptop, phone, or TV before the return period ends
- Tell a dead pixel (always black) apart from a stuck pixel (always one color)
- Capture proof of a defect for a warranty or refund claim
- Re-test a panel after shipping, repair, or long storage
- Try to revive a stuck pixel by rapidly flashing colors over it
How it works
- 1. Customize. Open the Customize panel to set text, colors, theme, and animation speed to your liking.
- 2. Go fullscreen. Click Fullscreen for an immersive, distraction-free display on any screen.
- 3. Done. No login, no install, nothing to download — it runs instantly in your browser and your settings are remembered.
Frequently asked questions
What's the difference between a dead and a stuck pixel?+
A dead pixel gets no power and stays black no matter what's on screen. A stuck pixel is frozen on one color, often red, green, or blue, and shows up against the other fields.
How do I run the test?+
Go fullscreen, then tap, use the arrow keys, or let it auto-cycle through each solid color. Look closely for any dot that doesn't match the surrounding field.
Can a stuck pixel be fixed?+
Sometimes. Rapidly cycling colors over a stuck pixel can occasionally free it. Dead pixels are a hardware fault and usually can't be fixed in software.
How many dead pixels are considered normal?+
Manufacturers allow a small number under their warranty policies, and the limit varies by brand and panel grade. It's easiest to return a device while it's still new.