Dead Pixel Checker
Check your display for dead or stuck pixels with auto color cycling or manual color selection.
Why Use Our Dead Pixel Checker
Universal Compatibility
Works on all screens - monitors, phones, tablets, laptops, and TVs
No Installation
Completely browser-based - no downloads or installations needed
Instant Results
Immediate detection of dead, stuck, and hot pixels
Flexible Testing
Auto cycling and manual modes with adjustable speed
Frequently Asked Questions
Auto mode cycles through colors automatically at your selected speed, which is great for quickly identifying dead pixels. Manual mode lets you select specific colors to test, which is useful for thorough examination of specific color issues.
A dead pixel is a pixel on an LCD display that remains unlit, appearing as a black dot regardless of what is displayed on the screen. This happens when the transistor powering the pixel fails.
A stuck pixel is a pixel that is permanently lit, appearing as a bright red, green, or blue dot on the screen. This occurs when the pixel gets stuck in the "on" position.
Test with both dark (black, blue) and light (white, yellow) colors. Dead pixels appear as black dots on light backgrounds, while stuck pixels appear as bright spots on dark backgrounds. Our auto mode cycles through these key colors.
Most manufacturers have a policy that allows for a small number of dead pixels (usually 3-5) before considering a display defective, but this varies by manufacturer and display class. Check your warranty for specific details.
About Dead Pixel Checker
Welcome to our comprehensive Dead Pixel Checker tool - your ultimate solution for detecting display defects on monitors, smartphones, tablets, and other screen devices. Our free online tool helps you identify dead pixels, stuck pixels, and other screen anomalies that can affect your viewing experience and device performance.
What Are Dead Pixels and Why Do They Matter?
Dead pixels are individual pixels on an LCD or OLED display that remain permanently black, regardless of what's being displayed. These occur when the tiny transistors that control individual pixels stop functioning. Stuck pixels, on the other hand, remain lit in a specific color (usually red, green, or blue) and fail to change with the rest of the display.
Identifying these pixel defects is crucial for several reasons:
- Quality Assurance: When purchasing new devices, checking for dead pixels ensures you're getting a quality product
- Warranty Claims: Most manufacturers have specific policies regarding acceptable numbers of dead pixels
- Professional Use: For photographers, designers, and video editors, perfect screen quality is essential
- Gaming Experience: Gamers need flawless displays for optimal immersion and competitive advantage
How Our Dead Pixel Checker Works
Our tool utilizes advanced color cycling technology to systematically test every pixel on your screen. The Auto Color Cycling mode rapidly switches between primary colors (white, red, green, blue, yellow, and black) to make dead and stuck pixels immediately visible. The Manual Color Selection mode allows you to test specific colors individually for thorough examination.
Tips for Effective Pixel Testing
For best results when using our Dead Pixel Checker:
- Clean your screen thoroughly before testing
- Test in a dimly lit room to reduce glare
- Use both auto and manual testing modes
- Test from different viewing angles
- Take screenshots or photos of any defects for documentation
Our Dead Pixel Checker is completely free to use, requires no registration, and works instantly in your web browser. Whether you're a casual user checking your smartphone or a professional testing high-end monitors, our tool provides reliable, accurate results to help you maintain perfect display quality.