Dead Pixel Test Online – Check Monitor & Laptop Screen
Inspect your computer monitor, laptop display, TV, or smartphone screen for dead, stuck, or bright pixels. Switch through pure full-screen RGB and monochrome colors, verify color uniformity, detect IPS glow and backlight bleeding, and inspect screen refresh rate (Hz) and resolution before return windows or warranty periods expire.
Pure Black Screen Mode
Tests for stuck/hot pixels (white, red, green, blue) & backlight bleeding
Display Hardware Diagnostics
How to Spot Dead vs Stuck Pixels
Shows as a persistent black dot on the Pure White test screen. The sub-pixel transistor is completely unpowered.
Shows as a persistent Red, Green, or Blue dot on the Pure Black test screen. Often fixable with rapid color cycling.
In a dark room on the Pure Black screen, check the monitor corners for yellowish or whitish glow leaking from the edges.
100% Client-Side Test: Runs directly on your device screen hardware. Works on phones, monitors, and laptops.
Pure Full-Screen Colors
Black, White, Red, Green, Blue, Cyan, Magenta, Yellow, and 50% Gray.
Live Refresh Rate (Hz)
Real-time hardware display refresh rate measurement and resolution detector.
100% In-Browser & Private
Zero installations. Works instantly on laptops, monitors, phones, and TVs.
How to Test a New or Used Monitor/Laptop for Screen Defects
Before testing, gently wipe your screen with a microfiber cloth to remove dust particles. A tiny speck of dust on the screen can easily look like a dead pixel!
Enter full-screen mode and view your screen from a normal sitting distance of 18–24 inches. Move your eyes slowly from top-left to bottom-right across every color pattern.
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Frequently Asked Questions (FAQs)
How do I test my screen for dead or stuck pixels?
Click the "Start Full-Screen Test" button. Your screen will display pure solid colors (Pure Black, Pure White, Red, Green, Blue, and Gray). Carefully inspect your display row by row. Click anywhere or press the Right Arrow key on your keyboard to cycle through each color.
What is the difference between a Dead Pixel and a Stuck Pixel?
A dead pixel has a failed transistor and appears as a permanent black dot on bright or white backgrounds. A stuck pixel has one or more sub-pixel RGB transistors locked on, appearing as a tiny red, green, or blue dot on a dark or black background. Stuck pixels can often be revived, whereas dead pixels are usually permanent hardware defects.
Can a stuck pixel be fixed?
Sometimes, yes! Stuck pixels can occasionally unstick after cycling through rapid RGB color changes or by running a high-speed pixel flasher for a few hours. Dead pixels (completely unpowered black spots) usually cannot be repaired and require warranty replacement.
How many dead pixels are acceptable under manufacturer warranty?
Most monitor and laptop manufacturers follow ISO 9241-307 (Class 1 or Class 2). Generally, Class 2 permits 2 to 5 dead/stuck pixels per million pixels before qualifying for an exchange. Premium brands like Apple, Dell UltraSharp, or ASUS ProArt often offer zero-bright-dot warranties.
How do I test for Backlight Bleeding and IPS Glow?
Turn off the lights in your room so the surroundings are completely dark. Switch to the "Pure Black" test screen. Look at the edges and corners of your screen. If you see bright yellowish, bluish, or white light leaking in from the bezels, your screen has backlight bleeding.
Does this test work on smartphones, tablets, and smart TVs?
Yes! Simply open this page in your phone, tablet, or TV web browser, tap "Start Full-Screen Test", and tap anywhere on the screen to switch colors.