DEAD PIXEL
A subpixel or pixel that remains permanently unlit and black, appearing dark even against bright or white test backgrounds.
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Dead Pixel Test
DISPLAY DIAGNOSTICInspect the screen for pixels that remain dark or display an unexpected color.
PatternsSolid ColorsCoverageFullscreenChecksDead · Stuck · Hot
RUNS LOCALLY
READYSolid Color Inspection
Current --Tested 0 / 10Elapsed 0s
Pixel Test · Ready
Ready to Test
Inspect the screen for pixels that remain dark or display an unexpected color.
Clean your screen, increase room lighting if necessary, and inspect the display carefully for pixels that remain different from the surrounding color.
BLACK#0000001 / 10
Next color in: 5.0s
Display inspection complete
Pixel Test Complete
NO ISSUES REPORTEDNo issues reported during the test.
Colors tested10
Duration52s
User-reported0
If you visually identify an abnormal pixel on the current solid color, click below to record your observation:
Suspected Dead Pixels0
Suspected Stuck Pixels0
Suspected Hot Pixels0
STUCK PIXEL
A subpixel whose liquid crystal cell remains locked in an open state, continuously displaying red, green, blue, or a fixed color.
HOT PIXEL
A pixel that remains continuously lit at full luminance across all channels, appearing as a bright white dot even against pitch-black backgrounds.
UNIFORMITY ISSUE
Visible clouding, backlight bleeding, or uneven brightness across sections of the panel, most noticeable on solid gray or dark screens.
Test Settings
Color Duration (Auto Test)
How to Test for Dead Pixels
- 1Clean the panel. Wipe the screen with a microfiber cloth so dust specks aren't mistaken for pixel defects.
- 2Enter fullscreen. Blank the entire panel with one exact color — no toolbars or borders hiding perimeter pixels.
- 3Scan row by row. Move your eyes systematically across each line and quadrant while the color holds steady.
- 4Mark suspects. Record each suspicious pixel with the tally buttons, then re-check it on a contrasting color.
What to Look For
Dead pixels appear black on the white field. Stuck pixels show a fixed red, green, or blue tint on contrasting fields. Hot pixels glaze white on the black field. The browser cannot read panel registers — nothing here is measured automatically; your visual inspection decides.
Dead Pixel Test Guide
Learn what dead, stuck and hot pixels are, how to test your display with solid colors, and what to do if you notice a suspicious pixel.
What Is a Dead Pixel?
A dead pixel is a permanently defective subpixel or pixel cluster that fails to receive electrical voltage. Because the liquid crystal shutter or OLED organic layer receives zero signal, it remains persistently unlit and appears as a permanent black dot against colored or white backgrounds.
What Is a Stuck Pixel?
A stuck pixel occurs when an individual red, green, or blue subpixel transistor freezes in an activated state, allowing light to pass continuously. Stuck pixels appear as sharp, static colored specks that stand out sharply against contrasting backdrops.
What Is a Hot Pixel?
A hot pixel happens when all three subpixel channels (Red, Green, and Blue) freeze open at full intensity. This creates a brilliant white pinpoint that is immediately obvious against dark, deep gray, or pitch-black visual scenes.
How to Test for Dead Pixels
Begin by gently cleaning your display screen with an anti-static microfiber cloth to eliminate dust specks. Launch the test in fullscreen mode and methodically inspect your monitor in a grid pattern across multiple high-contrast solid colors.
Why Solid Colors Are Used
Solid colors provide a completely flat, non-textured backdrop. Gradients or photographic wallpapers mask single-pixel defects, whereas pure primary and secondary colors isolate individual subpixel channels (Red, Green, and Blue).
How to Test Black
A pure black test screen (#000000) isolates hot pixels (bright white dots) and stuck subpixels (red, green, or blue dots). It also allows you to check for backlight bleeding and IPS glow along the panel edges.
How to Test White
A pure white test screen (#FFFFFF) energizes all subpixel channels simultaneously. Dead pixels will immediately reveal themselves as small black dots where illumination is absent.
How to Test Red, Green and Blue
Primary color screens isolate single subpixel channels. For instance, testing a solid green screen confirms that every green subpixel actuates properly; any unlit green cell will appear discolored or dark.
How to Check Screen Uniformity
Switching to the Display Uniformity tab displays 5%, 10%, 25%, 50%, 75%, and 90% gray screens. Uniformity tests expose dark vignetting, clouding patches, dirty screen effect (DSE), and uneven LED diffusers.
Dead Pixel vs Stuck Pixel
Dead pixels are always black and usually permanent due to a severed electrical circuit. Stuck pixels display vivid color (red, green, blue) and can sometimes be revived because the underlying transistor is still partially responsive.
What to Do If You Find a Bad Pixel
If your monitor was purchased recently, check the retailer's return window or manufacturer dead-pixel warranty. For stuck pixels, running a rapid color-cycling video or tool for 15–30 minutes can sometimes unfreeze the stubborn liquid crystal.
Important Testing Limitations
Web browsers cannot interrogate monitor hardware registers directly. You must visually inspect the screen yourself. A software test provides the visual surface, but human inspection provides the diagnosis.
A dead pixel is a defective display element that receives no electrical power or whose transistor has failed. As a result, it remains completely unlit and appears as a permanent black dot against white, red, green, or blue backgrounds.
A stuck pixel occurs when one or two subpixel color channels (red, green, or blue) remain continuously open due to a misaligned liquid crystal. Unlike dead pixels, stuck pixels display a vibrant color and can sometimes be unstuck using rapid color-cycling exercises.
A hot pixel is a defect where all three RGB subpixels remain permanently energized at maximum brightness, creating a persistent white dot that is clearly visible against black and dark test backgrounds.
Clean your monitor screen with a microfiber cloth to remove dust specs. Then launch the Dead Pixel Test in fullscreen mode, cycling through solid black, white, red, green, blue, and grayscale backgrounds while closely inspecting each quadrant of the screen.
No. Web browsers run inside a sandboxed software environment and cannot probe the microscopic physical hardware matrix of your display. This tool provides uniform, uncompressed solid color backgrounds so you can visually spot abnormal pixels with your eyes.
True dead pixels (where the thin-film transistor has physically burned out) generally cannot be repaired via software. However, stuck pixels can sometimes be massaged back to life using rapid color-cycling utilities or gentle mechanical pressure with a soft cloth.
Each pixel consists of three subpixels: Red, Green, and Blue. If only the green subpixel has failed, the pixel functions normally on pure red and blue screens, but shows an anomalous color whenever green light is required.
A bright pixel is either a hot pixel (permanently on) or a stuck subpixel. It stands out prominently during dark scenes, black backgrounds, or letterboxed movie playback.
Under the international ISO 9241-307 display standard (Class 1 vs Class 2), most consumer monitors permit between 1 and 5 dead or stuck pixels per million before qualifying for a manufacturer warranty replacement. Check your display manufacturer's specific dead-pixel policy.
No. Displaying solid colors is a standard operating function for any display panel. It uses standard web standards and does not push voltages or clock speeds beyond manufacturer specifications.
Yes. The Dead Pixel Test works equally well on desktop monitors, gaming laptop screens, MacBook Retina displays, tablets, and smartphones supporting a modern web browser.
Yes. Entering fullscreen mode removes browser toolbars, address bars, and window borders, ensuring the test color blankets 100% of the active panel so no perimeter pixels are obscured.
Ready to check your display?
Run a full-screen color test and visually inspect your screen for suspected dead, stuck or abnormal pixels.