Online Dead Pixel Monitor Test

Ensure your computer display is perfect with the industry-standard Online Dead Pixel Monitor Test Utility. A dead pixel is a microscopic hardware defect on a monitor's display panel where a single sub-pixel fails to change color or turn off, appearing as a permanent black or bright spot on your screen. Our tool provides a blank color page background for precision testing.

Professional Monitor Diagnostic Features

Our online monitor test tool is designed for precision display evaluation, used by tech enthusiasts and professionals to test new and used monitors for defects. Each color background page is optimized for pixel detection.

• Comprehensive Monitor Color Cycling Tool: Cycle through Red, Green, Blue (RGB), White, and Black blank screen pages to inspect every sub-pixel on your display. We also include CMY (Cyan, Magenta, Yellow) backgrounds to identify more complex color-reproduction errors during your monitor test.
• Dual Interface Control Utility: Choose Manual Monitor Test Mode for a pixel-by-pixel inspection (control via mouse or arrow keys) or Auto Cycle Diagnostic Mode for a hands-free display sweep across each blank color page.
• Zero-Distraction Full Screen Mode: Eliminate browser tabs, Windows taskbars, cursors, and MacOS docks. Our tool uses the device's native full-screen API for the purest possible monitor test environment with a blank background.
• Monitor Color Uniformity Test: Beyond just pixel defects, this utility helps you spot monitor backlight bleed, color tinting, and "clouding" issues across your entire IPS, VA, LED, or OLED display panel using our blank color page backgrounds.

The Ultimate New Monitor Checklist

Bought a new gaming monitor or 4K TV? Before you throw away the box, perform this 5-minute quality check to avoid keeping a defective unit:

1. Check for Dead Pixels: Use this tool to cycle through White, Red, Green, and Blue. If you see a tiny black dot, that's a dead pixel. Most manufacturers (Dell, LG, Samsung) have a specific policy (e.g., ISO 13406-2) on how many are allowed for a return.
2. Test for Backlight Bleed (IPS Glow): Switch to the Black Screen. In a dark room, look at the corners. Some glow is normal for IPS panels, but excessive yellow leakage is a defect.
3. Inspect Color Uniformity: Switch to Gray or White. Does one side of the screen look pink or yellow compared to the other? This "tinting" is common in cheaper panels and is grounds for a replacement.
4. Confirm Refresh Rate: While here, wiggle your mouse cursor. If it looks choppy, check your Windows Display Settings to ensure you are actually running at 144Hz or 240Hz, not 60Hz.

How to Perform a Professional Online Monitor Test

1. Enable Full Screen Mode: Click the "Full Screen" button to remove all distractions from your monitor and display a blank color page.
2. Cycle Monitor Colors: Slowly switch between pure white, black, and RGB color background pages using the test utility.
3. Inspect Monitor Closely: Look for tiny dots that don't match the background color on each blank page.
   • Dead Pixel: Remains black on a pure white screen background.
   • Stuck Pixel: Remains a single color (usually Red, Green, or Blue) on a pure black screen background.
4. Try a Stuck Pixel Fix: If you find a stuck pixel, try our Stuck Pixel Fixer Tool which uses rapid color flushing to "massage" the monitor's liquid crystal back into life.

Pro Tip: Performing a monitor test in a low-light room makes bright "stuck" pixels significantly easier to find against the blank background.