Screen dead pixel test
Fill the screen with solid colors to spot dead or stuck pixels.
The screen dead pixel test fills your entire screen with a sequence of solid colors — red, green, blue, white, and black — so you can look closely for any pixel that stays a different color than the rest, a common sign of a dead or stuck pixel.
Click or tap anywhere to cycle to the next color. Press Escape or click "Exit" to stop.
How to use
- Click "Start fullscreen test" and look closely at the screen for pixels that stay a different color than the rest.
- Click anywhere to cycle through solid red, green, blue, white, and black.
- Press Escape or click "Exit" when you're done checking.
Common use scenarios
- Checking a new monitor, laptop, or phone screen for dead or stuck pixels before the return window closes.
- Inspecting a secondhand device's screen before purchasing.
- Investigating a suspected screen defect you noticed during normal use.
- Periodically checking a screen you rely on for color-critical work.
✓Content & verification reviewed: 2026-08-27
How we verify Screen dead pixel test
How to get a reliable result from the test.
Each solid color reveals different kinds of defects
A stuck pixel showing a specific color often stands out more against certain backgrounds — cycling through red, green, blue, white, and black gives each type of defect its best chance to become visible.
Lighting and viewing angle affect visibility
Dim the room and look at the screen straight-on and from a few angles — reflections and glare can hide a genuine dead pixel or create a false impression of one.
This only helps you see a defect — it can't fix one
A genuinely dead pixel is a hardware issue; some stuck (not dead) pixels can sometimes be resolved with pressure or flashing-color methods found elsewhere, which this tool doesn't attempt.
Before you rely on the result
- You've dimmed the room and checked the screen from a few angles.
- You've cycled through all five colors, not just one.
- You've looked closely at every area of the screen, including edges and corners.
- You've noted the exact pixel location if you find a defect, for a support or return claim.
Who this is for
- Anyone checking a new device's screen before a return window closes.
- People inspecting a secondhand device's screen before purchasing.
- Anyone investigating a suspected screen defect.
- People who rely on a screen for color-critical work and want to check it periodically.
Real-world examples
New device inspection
Someone runs the test right after unboxing a new monitor or phone to check for defects while a return is still possible.
Secondhand purchase check
A buyer runs the test on a secondhand device before completing the purchase, to check the screen's condition firsthand.
Investigating a suspected defect
Someone who noticed an odd spot on their screen during normal use runs the test to confirm whether it's a genuine dead or stuck pixel.
Limitations
- This only helps you visually spot a dead or stuck pixel — it can't repair one, and very small defects may still be hard to see depending on your screen and lighting.
Frequently asked questions
What's the difference between a dead pixel and a stuck pixel?
A dead pixel stays black (unlit) regardless of what's displayed; a stuck pixel stays fixed on a single color (like red, green, or blue). Both show up as an out-of-place dot during this test.
Can this tool fix a stuck pixel?
No — it only helps you visually identify one. Some stuck pixels can sometimes be resolved with other methods (like gentle pressure or rapid color flashing), which this tool doesn't perform.
Why should I check from different angles?
Screen reflections and glare can obscure a real defect or create a false impression of one — checking straight-on and from a few angles gives a more reliable result.
Does this work on any device?
It works on any device with a browser that supports fullscreen display — the test itself is just solid-color rendering, so it should work broadly across phones, tablets, laptops, and monitors.
🔒 Runs in your browser — nothing is uploaded. Results are for reference only; see the disclaimer. Last updated: 2026-08-27
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