Dead Pixel Test

Check a monitor, laptop, TV or phone for dead, stuck or hot pixels. The display shows one solid colour at a time and moves on only when you click, tap or press a key, so you can look closely at every part of the panel without anything flashing at you.

Monitor Tests Runs in your browser

Test Your Screen for Dead Pixels

JavaScript is required. This tool runs in your browser, so please enable JavaScript to use it. The instructions below are still available.

The colour changes only when you click the display, press Next or use the arrow keys or Space. It never cycles automatically.

How to Use the Dead Pixel Test

Clean the screen and set it to normal brightness.
Press Full screen. The first colour is black.
Click the screen, press Next color, Space or the right arrow to move on; use the left arrow to go back.
On each colour scan the panel slowly. A dot that stays black on white is dead; a dot stuck in red, green or blue is stuck; a lit dot on black is hot.
Press Exit full screen or Escape when done.

About This Tool

Anyone who has just bought a screen and is still inside the return window, second-hand buyers, and technicians checking a repaired display.

Input: Colour sequence · Output: Full-screen test colours.

Features and Limitations

Features

Nine test colours, or a short red, green and blue sub-pixel sequence.
User-paced: no timers, no automatic cycling, and fast key-repeat is limited to three changes per second.
The current colour name and position are written in the control bar.
Controls fade in full screen so they don't hide pixels; move the mouse or press a key to bring them back.

Limitations

The test helps you see faulty pixels; it cannot repair them.
Very small defects on high-density phone screens can be hard to see without a magnifier.
Dust or a speck on the glass can look like a dead pixel; wipe the screen and look from an angle to tell them apart.
Results are computed in your browser; nothing you enter is sent to a server.

Frequently Asked Questions

What is the difference between dead and stuck pixels?

A dead pixel stays dark on every colour. A stuck pixel stays lit in one colour (often red, green or blue). A hot pixel stays white or bright on black.

Can a stuck pixel fix itself?

Sometimes a stuck pixel recovers after hours of use or gentle pressure, but there is no guarantee. Rapidly flashing “pixel fixer” videos can trigger seizures, so this tool deliberately does not flash.

How many dead pixels are acceptable?

It depends on the manufacturer's pixel policy (often based on ISO 9241-307 classes). Check your warranty terms before the return period ends.

Why does the colour not change automatically?

Automatic cycling can flash too fast for people with photosensitive conditions, and you need time to inspect each colour anyway.