Dead Pixel Test

About Dead Pixel Test

A dead pixel test fills your screen with solid colors so faulty pixels stand out. Pick a color to go fullscreen, then look closely: a dead pixel stays black on every color, a stuck pixel stays lit, and a black screen reveals backlight bleed. Cycle colors with a click or the arrow keys and press Esc to exit. It works on any monitor or phone screen, entirely in your browser.

Frequently asked questions

What's the difference between a dead and a stuck pixel?

A dead pixel receives no power and stays black on every color. A stuck pixel is fixed on one color (red, green, or blue), so it shows up against the opposite backgrounds.

How do I check my monitor for dead pixels?

Clean the screen first, then go fullscreen and step through each solid color, inspecting closely in a dim room. Any dot that doesn't match the background is a dead or stuck pixel — a dead one has sharp square edges, while dust looks irregular.

Can this fix a stuck pixel?

This tool tests for pixel faults rather than repairing them, but stuck pixels sometimes recover by rapidly cycling colors in that area, or with gentle pressure — so cycling the colors here can occasionally help. Dead pixels usually can't be fixed.

What is backlight bleed?

It's light leaking around the edges of an LCD, most visible on an all-black screen in a dark room. Some bleed is normal; excessive bleed may warrant a return.

Does the dead pixel test work on a phone?

Yes. It runs in any mobile browser, so you can check an Android phone, iPhone, or tablet screen the same way — tap to cycle colors and inspect closely, and press Back to exit.