Monitor Dead Pixel Test
Loading…
About this Tool
Monitor Dead Pixel Test is a 100% free online screen testing utility that displays full-screen solid colors (White, Black, Red, Green, Blue, Yellow, Magenta, Cyan, Gray) and contrast gradient patterns. It allows you to quickly and accurately detect dead pixels, stuck pixels, subpixel defects, backlight bleeding, screen clouding, and burn-in image retention on desktop monitors, laptops, tablets, and smartphones without installing any software or registering an account. Featuring intuitive keyboard shortcuts, mouse clicks, and touch gestures, anyone can audit display quality in under a minute.
Processed safely on your device
Everything happens in your browser on this device. Your files are never sent to our servers—so you can use it with peace of mind.
How to Use
Clean your screen gently with a microfiber cloth before testing to remove dust and surface smudges.
Click the 'Start Dead Pixel Test' button or choose any color preset card to enter full-screen testing mode.
Click anywhere on the screen, press Space, or use the Left/Right Arrow keys to cycle through the core solid colors and gradient patterns.
Inspect for black spots on white (dead pixels), glowing colored dots on black (stuck pixels), and backlight bleeding on dark backgrounds, then press ESC to exit.
Key Scenarios & Use Cases
New Monitor & Laptop Out-of-Box Panel Inspection
Verify brand-new displays right after unboxing to ensure they meet manufacturer zero-defect criteria within the return/exchange window.
In-Person Verification for Used Monitor Purchases
Check pre-owned monitors or laptops in front of the seller via any web browser with no software setup required.
OLED Permanent Burn-in & Image Retention Testing
Check smartphone and OLED monitor screens for ghosting artifacts caused by prolonged display of static taskbars, navigation docks, or game HUDs.
IPS & VA Backlight Bleeding & Clouding Diagnosis
Evaluate backlight uniformity and edge clouding (IPS glow) in a darkened room using the pure black screen mode.
Color Uniformity & Contrast Ratio Calibration
Use gray gradients to verify that your monitor displays continuous shadow details from 0% pure black to 100% white without banding.
Frequently Asked Questions (FAQ)
A dead pixel is permanently unpowered and appears as a black dot even on a pure white screen. A stuck pixel has one or more subpixels permanently energized, glowing red, green, blue, or white against dark backgrounds.
Zero-bright-dot (ZBD) warranty models typically qualify for replacement with 1 stuck pixel or 2-3 dead pixels. Standard consumer panels often require 5 or more defects or defects clustered in the central viewing area.
Yes. On mobile browsers that restrict full-screen mode, it automatically switches to an edge-to-edge overlay view with touch-to-advance and an easy-to-tap close button in the top-right corner.
Gently wipe the screen with a clean microfiber cloth. If it remains, view the spot from different angles. Dust on the outer protective glass will shift relative to the pixel grid beneath it, while a dead pixel resides inside the LCD cell and never shifts position.
Some stuck pixels caused by minor transistor lockups can occasionally be revived using rapid RGB color flashing tools. However, completely unpowered dead pixels represent physical hardware defects that require panel replacement.
No. All test patterns and color transitions run 100% locally within your browser's client-side canvas memory with zero ongoing network transmission.