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.