Dead pixel ALWAYS DARK
A pixel that remains black on bright backgrounds may be dead. Color cycling cannot restore a failed pixel.
How to test your screen
Prepare the display
Gently clean the screen. Use a comfortable brightness and reduce reflections.
Open a solid color
To test dead pixels, start the full-screen test or select a color above. Move the pointer away and let the hints fade.
Look across the panel
To check for dead pixels, look for dots that stay dark on bright backgrounds. Also inspect for dots that stay bright or differ from their surroundings.
Check all nine colors
Click, swipe, or use the arrow keys. Confirm suspicious dots on several colors, then press Esc to leave.
What does that dot mean?
Stuck subpixel ONE COLOR
A dot that stays red, green, or blue may have a stuck subpixel. Compare it against all primary colors.
Hot pixel ALWAYS BRIGHT
A bright dot on black may be a hot or stuck pixel. These enlarged diagrams are visual guides, not a diagnosis.
Any screen.
A careful inspection.
PHONE
Swipe through the colors. If full screen is unavailable, the test fills the browser viewport. Browser bars, notches, and rounded corners may remain outside the test. On iPhone, use Safari’s Add to Home Screen option and open the saved app to reduce browser chrome; coverage still depends on your device.
LAPTOP
Use the display’s native resolution and inspect without glare. Clean dust away before treating a small mark as a pixel defect.
MONITOR
Move this window to the monitor you want to check before starting. Test each display separately; the tool cannot inspect another screen remotely.
Can dead pixels
be fixed?
A stuck subpixel may recover with a stuck pixel fixer, but repair is not guaranteed. Dead pixels caused by hardware failure cannot be repaired by color cycling.
Never press or rub the panel; if a defect persists, check your seller’s return terms or the manufacturer’s pixel policy, as coverage varies.
A few useful answers.
Is this a dead pixel checker or a dead pixel detector?
Both names describe this visual test: it displays solid colors so you can inspect the panel yourself, without automatic detection. A browser cannot read the physical state of your pixels.
Can I test an iPhone or Android phone?
Yes. Tap to cycle or swipe between colors. Some browsers cannot enter true full screen, so the test fills the available viewport. It cannot promise coverage beneath browser bars, notches, or rounded screen edges.
Is a black dot always a dead pixel?
No. Dust, a surface mark, or damage can look similar. Clean the screen safely and check multiple colors. A persistent black dot on bright backgrounds is consistent with a dead pixel.
Can the stuck pixel tool repair my screen?
The stuck pixel fixer may help stuck subpixels, but cannot repair dead pixels or guarantee recovery. Its small flashing area requires acknowledging a flashing-content warning.
Why is the refresh estimate different from my settings?
The estimate counts animation frames for about one second. Browser scheduling, power saving, display switching, and workload affect it. It is not a certified measurement of the panel’s refresh rate.