Clean the screen
Dust, dirt, and tiny marks can look like pixel defects. Clean the display safely before judging a suspicious point.
FULLSCREEN · INSPECT · VERIFY
Dead Pixel Test
Fill your display with controlled solid colors and visually check for suspicious dark, bright, colored, or stuck pixels.
This app does not scan the physical panel or automatically detect defects. You inspect the display yourself while the browser shows uniform test colors.
Inspect nine solid colors
Move this window onto the display you want to check. Clean the screen first, then start the test and inspect each color carefully.
Tap/click the field or use ← → Space · Home/End jump to first/last
Ready. Start the dead pixel test when you want to inspect the display.
0.1.1What this dead pixel test does
Dead Pixel Test draws uniform black, white, primary-color, secondary-color, and gray fields in the browser. Those controlled backgrounds make it easier to visually notice a suspicious physical pixel that stays dark, bright, or an unexpected color.
Inspect every color
Bright fields can expose persistent dark points; dark fields can expose persistent bright or colored points; RGB and CMY fields add channel-specific contrast.
Check again before concluding
Revisit a suspicious spot on several colors and compare it with the surrounding pixels before deciding that the display itself is damaged.
How to test for dead pixels
- Clean the display using the manufacturer's recommended method.
- Move this browser window onto the monitor or screen you want to inspect.
- Choose Start dead pixel test.
- If fullscreen opens, inspect the entire panel. If fullscreen is unavailable, continue in the browser window.
- Use the field, Previous/Next buttons, or keyboard controls to inspect all nine colors.
- Choose Exit test when you finish.
Dead, bright, and stuck pixels
A suspicious dark point that remains dark against bright or colored fields may indicate a dead/dark pixel or subpixel. A point that remains illuminated or an unexpected color against dark fields may indicate a bright or stuck pixel. The browser cannot identify the hardware cause automatically, so the test uses cautious visual language rather than declaring a defect.
Why the test uses different colors
Black can reveal persistent bright or colored points. White and bright colors can make persistent dark points easier to notice. Red, green, and blue isolate the primary display channels, while cyan, magenta, yellow, and gray provide additional contrast. These browser-rendered values are not calibrated physical colors.
Fullscreen is helpful, not required
Browsers allow fullscreen only after user activation and can refuse or exit fullscreen. If that happens, the test stays usable inside the browser window and reports the real state instead of pretending fullscreen succeeded.
What this test cannot diagnose
This app cannot automatically count defective physical pixels, inspect panel electronics, certify a display as defect-free, measure refresh rate, calibrate color, diagnose backlight uniformity, test touch input, or determine warranty eligibility.
If you find a suspicious pixel: clean and recheck the exact spot on several colors, avoid pressing hard on the panel, document the physical screen if needed, and review the current pixel/warranty policy for your exact display manufacturer and model.
Does a screenshot capture a dead pixel?
Usually no. A screenshot records the image the computer intended to render, not a physical panel defect. Photograph the physical display if you need to document a visible hardware issue.
What is a dead pixel?
It is commonly used to describe a physical display pixel or subpixel that does not illuminate as expected. On a bright test field it may appear as a persistent dark point.
What is a stuck pixel?
It is commonly used for a pixel or subpixel that remains illuminated or stuck on an unexpected color. It may stand out most clearly against a dark or contrasting test field.
Can this test automatically detect bad pixels?
No. The browser can draw controlled colors but cannot directly read the physical state of every panel pixel. You perform the visual inspection.
Can this tool fix dead or stuck pixels?
No. Dead Pixel Test does not include a flashing pixel fixer, pressure technique, or repair claim. It is an inspection tool only.
Does it work on monitors and laptops?
Yes, when the browser can display the test fields on the screen you want to inspect. Move the window onto that display before starting fullscreen.
Can I use it on a phone or tablet?
Yes. The test supports touch navigation and windowed/fullscreen operation where the mobile browser allows it. Browser and operating-system controls can still remain visible on some devices.
Does it work on LCD and OLED displays?
The visual color-field method can be used on both, but panel technologies behave differently and manufacturer pixel policies vary. The app does not certify panel type or defect thresholds.
Why won't fullscreen open?
The browser or operating system may reject fullscreen, or fullscreen may be unavailable in the current environment. The test continues in the browser window.
Can dust look like a dead pixel?
Yes. Small dust or surface marks can look like dark pixel defects, which is why cleaning and rechecking the screen comes first.
Should I press or massage a suspicious pixel?
This app does not recommend applying pressure to the display. Physical pressure can damage some panels; follow the display manufacturer's current guidance instead.
Read the testing guide for a deeper explanation of visual pixel inspection, fullscreen, and test limits.