The Tools Pixel Dead Pixel Checker tests your monitor or smartphone display for stuck, dead, or defective pixels using full-screen color cycles — processed entirely in your browser with no data sent to any server.
Instructions: Look closely at your screen for any pixels that don't change color, appear stuck, or show a different color than the rest — these indicate dead or stuck pixels.
Modern screens contain millions of tiny light-emitting structures called sub-pixels (typically grouped into Red, Green, and Blue sets). If a transistor controlling a sub-pixel fails, it can result in a defect. A dead pixel stays black because it is completely unpowered. A hot pixel remains white because all sub-pixels are receiving power constantly. A stuck pixel displays a single color (often red, green, or blue) because one or two sub-pixels are malfunctioning.
Identifying these defects manually is difficult during everyday use because busy desktop images hide tiny dots. Solid colors covering the entire display make any variance immediately noticeable to the naked eye.
Before starting the test, clean your screen surface using a soft microfiber cloth to remove dust and smudges, which are easily mistaken for dead pixels. Click the button to enter fullscreen mode. Cycle through each primary color swatch slowly, and lean in close to scan the monitor from top to bottom. Pay special attention to corners and edges where defects are frequently overlooked.