Monitor Pixel & Screen Test
Detailed diagnostic to detect dead pixels, stuck pixels, and backlight bleed.
Click anywhere or use Spacebar to cycle colors. Press Esc to exit.
Backlight Bleed
Use the Black screen in a dark room to check for light leaking through the edges of your panel. Common on IPS and TN panels.
Dead Pixels
Use White and high-vibrancy colors to isolate pixels that are permanently off (Black) or stuck (Bright colors).
IPS Glow
Verify if your panel has the characteristic silver/yellow glow at off-center viewing angles during the black screen calibration.
Test Your Monitor for Dead Pixels
Buying a new monitor is an investment. Our Monitor Test helps you verify that your screen is perfect from the moment you unbox it. We provide high-fidelity solid color fields to highlight any manufacturing defects.
What is a Dead Pixel?
A dead pixel is a point on your screen where the liquid crystal is permanently turned off, appearing as a tiny black dot regardless of what is displayed. A Stuck Pixel is the opposite—it's permanently on, usually appearing as bright Red, Green, or Blue.
How to Detect Backlight Bleed
Backlight bleed occurs when light is not completely blocked by the LCD panel, causing bright patches on the edges of the screen. To test this, turn off the lights in your room, launch our Black Screen Test, and look for uneven light distribution near the bezels.
IPS Glow vs. Backlight Bleed
IPS Glow is a natural property of IPS panels that changes as you move your head. Backlight bleed is a hardware defect and remains in the same spot regardless of your position. Our IPS Glow test helps you distinguish between the two by using moving color fields.
Monitor Test FAQ
Does this work on 4K or 8K monitors?
Yes. Our tester is resolution-independent and will fill every available pixel on your display, whether it's 1080p, 1440p, 4K, or 8K.
Can I fix a dead pixel?
While stuck pixels (bright) can sometimes be "massaged" back to life or fixed with rapid color flashing, true dead pixels (black) are usually a hardware failure that requires a panel replacement.
Is this monitor test free?
Yes, all diagnostic tools on TestMyDevice are 100% free and run directly in your browser.