Dead Pixel Test
Check any monitor, TV, laptop, tablet or phone for dead pixels, stuck pixels and bright sub-pixel defects in seconds with full-screen solid colors.
How to use the dead pixel test correctly
Open the test in full screen, clean the panel first, then move through black, white, red, green and blue screens one by one. Defects become much easier to spot when you check the same point across multiple colors.
This page helps people searching for a dead pixel test, stuck pixel test or dead pixel checker. It works entirely in the browser, so there is nothing to install and no screenshot ever leaves your device.
- A bright dot on a black screen often points to a stuck pixel.
- A black dot on a white screen can indicate a dead pixel.
- If a dot appears on only one color, it may be a sub-pixel issue rather than a fully dead pixel.
- On phones and tablets, tap the screen once or twice to reveal the Next and Exit controls.
How to read the result
Use the focused test first, then confirm what you see on at least one or two additional steps. A single quick glance can be misleading on glossy panels, OLED screens or displays with strong reflections.
- Clean the panel surface before you decide that a defect is real.
- Check from your normal viewing distance first, then move closer.
- Retest with another related tool if the issue could also be caused by uniformity, sync or motion settings.
- If you are within the return window, take notes or photos while the issue is still easy to reproduce.
Related tests you should also try
Dead & Stuck Pixel Test
Cycle pure colors to locate permanently dark, bright or color-locked pixels.
Stuck Pixel Fixer Tool
Run a fast local strobe that may help revive some stuck sub-pixels.
IPS Glow / Light Bleed
Open a true black screen and inspect corners for glow, haze or backlight bleed.
Panel Uniformity / Dirty Screen
Check gray and white screens for dark patches, tinting or dirty screen effect.
Frequently asked questions
A dead pixel stays dark because it no longer lights up correctly. A stuck pixel still receives power, but one sub-pixel remains locked on red, green, blue or white.
Yes. Test a new monitor during the return window so you can decide quickly if a panel defect is serious enough for exchange or refund.
Yes. Open the page on your phone, switch to full screen if possible and tap the screen once or twice whenever you need the controls.
Sometimes. A stuck pixel fixer or time can help some pixels recover, but a fully dead pixel is usually permanent.
Run the test, then interpret the result
Solid colours make a suspicious dot easier to see; they do not identify its cause by themselves. Use the checks below to distinguish a physical pixel defect from dust, a surface mark or rendered content.
What is a dead pixel?
A dead pixel is a pixel that no longer responds to power and usually stays black.
A stuck pixel is different because it may remain red, green, blue, or white.
- Many users confuse dust, smudges, or compression artifacts with real panel defects, so full-screen solid colors are the best way to test.
How to test properly
Clean the screen gently.
Use the monitor at native resolution.
- Inspect black, white, red, green, and blue backgrounds in full screen.
- If the same point appears in the same position across several colors, the chance of a real defect is much higher.
How serious is it?
A defect near the center is usually more distracting than one in a corner.
Bright stuck pixels stand out more in dark games and movies.
- If the monitor is new, testing early gives you better return options.
Rule out false positives
Inspect the suspected spot with the display turned off first. Dust or a surface mark can resemble a dead pixel on a bright field. Then compare the same location on black, white, red, green and blue. If the mark also appears inside a screenshot viewed on another device, the source may be software or content rather than the physical panel.
Document a repeatable result
- Record the model, connection, native resolution and test date.
- Take one close photograph and a second image showing the spot's position on the full panel.
- Note whether the defect remains visible at a normal viewing distance in everyday content.
Pixel policies vary by manufacturer, model, seller and country, so this guide cannot make a warranty decision. Check the current terms for the exact product. If you try the flashing stuck-pixel tool, use short sessions, never press or rub the panel, and do not run it near anyone sensitive to flashing light.
Classify the dot with four checks
| Check | Observation | Next step |
|---|---|---|
| Screen off | The mark reflects light or changes after safe cleaning | Rule out a surface mark before describing a pixel defect. |
| Five solid colours | The same physical location stays dark or locked to one colour | A pixel or sub-pixel defect becomes more likely. |
| Screenshot on another device | The dot is present in the image file | Investigate software, an overlay, cursor or source content. |
| Normal viewing distance | The dot is visible only from a few centimetres away | Record the technical finding separately from its everyday impact. |
For a support request, record the exact model, serial number, connection, native resolution, scaling setting and test date. Keep one close photograph and one image showing the whole panel. Pixel policies vary by model, seller and country, so verify the current terms for the exact product instead of relying on a universal pixel count.