Check 9 solid colors for unusual dots. Visual inspection — no automatic diagnosis.
Select any color to enter the test immediately.
Tap to change color · Swipe left / right · Double-tap to exit
Clean dust away first. Look for dots that differ from the surrounding color.
About stuck pixel repair ↗This is your visual observation, not an automatic diagnosis.
Compare your observation with the simulated examples, then save your observation and photo notes.
Gently clean the screen. Use a comfortable brightness and reduce reflections.
To test dead pixels, start the full-screen test or select a color above. Move the pointer away and let the hints fade.
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.
Click, swipe, or use the arrow keys. Confirm suspicious dots on several colors, then press Esc to leave.
Use the new or used screen inspection checklist to plan your check. After checking a new screen, note the device model, test date, colors and location of any unusual mark. Repeat the check after gently cleaning the screen according to the manufacturer's instructions.
Use another phone or camera to photograph a suspected physical pixel defect. A screenshot captures the image generated by the device; it does not record a physical defect in the panel. Take a wider photo and a close-up of the same location against white, black and the primary colors. Keep the original photos.
Check the seller's return deadline and your manufacturer's pixel policy. Coverage varies by model, seller and region. A browser test helps you describe what you observe; it cannot determine warranty eligibility. Do not press, rub or heat the screen.
For a manufacturer example, see Dell's display pixel guidelines. Apply the policy for your own device.
Fill this in yourself after inspecting the screen. It is an observation record, not an automatic diagnosis.
Device / display model:
Test date:
Operating system and browser:
Display resolution and browser zoom:
Brightness setting:
Full-screen mode or browser viewport only:
Background colors checked:
Approximate mark location:
Appearance on white:
Appearance on black:
Appearance on red / green / blue:
Same location after cleaning and retesting:
Photo filenames (taken with a separate camera):
Seller return deadline / model-specific policy link:
Next step:These enlarged, simulated illustrations are not photos or a diagnosis. The mark stays in the same position in each pair; its visibility changes with the background. Inspect your actual display using all nine colors.
A small dot that remains dark on several bright backgrounds may be a dead pixel or subpixel fault. Dust can look similar: clean safely, then compare the same location again. Color cycling cannot repair a physically failed pixel.
A persistent colored dot may be a stuck subpixel. Its apparent color can change with the background: in this simplified example, a stuck red component looks red on black and magenta on blue. It can be harder to see against a matching background. Compare black and all three primary colors before considering the optional stuck pixel experiment.
A persistent bright dot may be a bright pixel or subpixel defect. Its appearance on black alone does not identify the cause. Check white and the primary colors, and record what changes.
A broad mark does not look like a single isolated pixel. Surface residue, reflections and other panel problems can resemble defects. Follow the manufacturer's cleaning instructions, change your viewing angle, and photograph a persistent mark rather than trying to repair it by pressing the screen.
See Dell's examples of bright and dark pixel defects for a manufacturer reference. For a new or used device, follow the screen inspection checklist and keep an observation record.
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. For iPhone-specific steps and coverage limits, see the iPhone screen test guide. 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.
Use the display’s native resolution and inspect without glare. Clean dust away before treating a small mark as a pixel defect.
Move this window to the monitor you want to check before starting. Test each display separately; the tool cannot inspect another screen remotely.
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.
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.
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.
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.
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.
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.
Drag the square onto the dot. Keyboard: Tab to square, then arrow keys. No guaranteed repair. The session clock keeps counting while paused.