Free Dead Pixel Test Online
Test your monitor, laptop, TV, phone, or tablet for dead and stuck pixels with our free fullscreen screen test. Instant diagnostics with no download or signup required.
Zero installation. 100% client-side privacy.
Comprehensive Display Diagnostic Suite
Instant browser-based diagnostics engineered for device buyers, secondhand hardware shoppers, and display enthusiasts.
Dead & Stuck Pixel Test
Cycle pure RGBW backgrounds in fullscreen with hands-free auto-cycle and an RGB noise pixel fixer box.
Launch Tool →
Screen Resolution & DPR
Check reported screen resolution, viewport size, Device Pixel Ratio (Retina/High-DPI), and zoom scaling factor instantly.
Check Resolution →
Refresh Rate (Hz) & Motion
Estimate refresh behavior and frame timing (60Hz, 120Hz, 144Hz, 240Hz+) with frame time ms and motion stability test.
Measure Hz →
Backlight Bleed & IPS Glow
Fullscreen pure black tests to spot edge light leakage vs IPS glow vs OLED burn-in retention.
Test Bleed →
Webcam & Microphone Test
Verify camera resolution, stream FPS, mic audio spectrum meter, and snapshot photo capture.
Test Webcam →What Is a Dead Pixel Test?
A dead pixel test is a visual display diagnostic that fills your entire screen with solid, uniform background colors to make defective pixels instantly visible to the naked eye.
Under normal daily use—such as browsing websites, watching movies, or playing games—a single non-functioning pixel can easily blend into complex graphics and busy textures. By launching a true edge-to-edge fullscreen test with high-contrast solid backgrounds such as Red, Green, Blue, White, Black, and Yellow, any pixel that fails to illuminate or stays locked on the wrong shade immediately stands out against the uniform field.
Our online dead pixel test works across all types of modern digital screens:
What Is a Pixel?
A pixel (short for picture element) is the smallest physical building block of a digital screen. Millions of pixels work in unison to render every image, video, and piece of text you see.
Understanding RGB Subpixels
Every individual pixel is divided into three smaller components called subpixels: Red (R), Green (G), and Blue (B).
By precisely controlling the electrical voltage fed into each subpixel transistor, your screen adjusts the intensity of each primary color from 0 to 255 (in 8-bit displays). When these three colored lights shine simultaneously at different brightness levels, their additive color mixing creates over 16.7 million distinct colors.
When all three subpixels shine at 100% intensity, your eye perceives pure White. When all three are turned off, you see Black. If an individual subpixel fails to receive voltage or gets stuck open, a pixel defect occurs.
Dead Pixel vs Stuck Pixel vs Hot Pixel
Screen defects present in different ways depending on which component of the transistor array has failed.
Dead Pixel
Unpowered- Appearance: Usually appears as a static, solid dark/black spot.
- Illumination: Does not illuminate normally across any solid color background.
- Root Cause: Indicates a hardware-level transistor or circuit trace failure.
- Fixability: Software generally cannot restore a genuinely dead pixel.
Stuck Pixel
Energized- Appearance: Often remains locked on red, green, blue, yellow, or magenta.
- Illumination: A subpixel remains permanently open and energized with current.
- Root Cause: Liquid crystal orientation freeze or electrical signaling lock.
- Fixability: Some stuck pixels respond to high-frequency RGB color strobes (results not guaranteed).
Hot Pixel
Full Power- Appearance: Usually appears as a permanently bright, glowing white point.
- Illumination: All RGB subpixels remain permanently on at maximum intensity.
- Root Cause: Over-energized short-circuit or high voltage leakage to the pixel.
- Fixability: Rarely resolves via software; often requires hardware service or panel replacement.
How to Test Your Screen for Dead Pixels
Follow these five structured steps for an accurate, professional display inspection in under two minutes.
Clean Your Screen
Dust particles, oily fingerprints, and surface debris can easily be mistaken for pixel defects. Gently wipe the glass with a clean, dry microfiber cloth before testing.
Adjust Your Environment
Dim overhead lights and eliminate strong glare or window reflections so microscopic subpixel imperfections are easier to distinguish across the panel.
Open the Fullscreen Test
Launch our free Dead Pixel Test tool. Edge-to-edge fullscreen hides browser navigation bars and taskbars so you can check borders.
Cycle Through Test Colors
Use keyboard arrow keys, spacebar, or touchscreen taps to cycle through the solid color sequence (White, Black, Red, Green, Blue, Yellow).
Inspect the Entire Display
Carefully scan the center, corners, edges, and borders. Compare suspicious specks across multiple colors to confirm if a dot stays dark or locked.
Which Test Color Should You Use?
Different colors reveal different types of pixel and subpixel flaws. Cycling through multiple solid fields provides the most thorough visual diagnostic.
White Screen
All RGB subpixels are fully illuminated. Dark or completely black defective pixels are easiest to spot against a bright white background because unpowered transistors produce high visual contrast.
Black Screen
All subpixels should be turned off. Permanently bright hot pixels, glowing stuck subpixels, and edge backlight bleed become immediately noticeable against pure black.
Red Screen
Useful for checking the red subpixel matrix and identifying issues affecting green and blue channels, or spotting abnormal subpixels that fail to match the red field.
Green Screen
Human eyes are most sensitive to green wavelengths. A green screen helps you verify green channel transistors and quickly spot any pixel that fails to illuminate in sync.
Blue Screen
Essential for testing the blue subpixel channel and identifying abnormal or sluggish subpixels that fail to sustain proper voltage across darker primary fields.
Yellow Screen
Combines 100% red and 100% green subpixels. Yellow provides complementary contrast to expose complex multi-subpixel anomalies that single primary channels might miss.
Test Any Screen
Find diagnostic details and testing recommendations tailored to your specific hardware.
Laptop Screen
Check your laptop display for dead pixels, stuck pixels, and other visible defects before your return period closes.
Laptop Screen Test →Desktop Monitor
Inspect gaming, office, professional, and high-refresh-rate monitors for color uniformity and pixel defects.
Monitor Screen Test →TV Screen
Check OLED, LED, QLED, and large television panels before signing off on delivery or accepting a new TV.
TV Screen Test →Phone & Tablet
Inspect mobile displays for pixels that remain dark, bright, or stuck on a particular color across iOS and Android.
Mobile Screen Test →Check Your Screen Before the Return Window Closes
Retail return windows (typically 14 to 30 days) offer full replacements or refunds with no questions asked. Most manufacturer warranties under ISO 9241-307 require 2 to 5 dead pixels before qualifying for repair. Always inspect new and secondhand displays immediately!
Printable Screen Inspection Checklist
Fill out this checklist to compile a printable diagnostic record locally inside your browser memory.
Frequently Asked Questions
Common questions regarding dead pixels, stuck subpixels, screen testing methods, fixability, and return policies.
A dead pixel is a defective display element where the subpixel transistors receive no electrical charge, causing it to remain permanently dark or solid black across all backgrounds.
A stuck pixel occurs when one or more subpixels remain continuously energized in an open state, staying frozen on a specific primary color such as red, green, blue, or yellow regardless of what image is shown.
A hot pixel is an abnormal pixel that remains permanently illuminated at full brightness, usually appearing as a constant white dot regardless of the displayed background.
Clean your monitor with a microfiber cloth, open our free Dead Pixel Test in fullscreen mode, and cycle through solid white, black, red, green, blue, and yellow backgrounds while carefully inspecting the screen from center to edges.
Yes. Our dead pixel test works directly inside modern web browsers on Windows laptops, MacBooks, Chromebooks, and Linux laptops with no software downloads needed.
Yes. You can open DeadPixelTests.com via your Smart TV built-in web browser or connect a PC, laptop, or streaming console via HDMI to display fullscreen color tests.
Yes. Open the test in Safari on iOS or Chrome on Android and tap the screen to cycle through fullscreen solid colors to inspect phones and tablets.
A genuinely dead pixel indicates a permanent hardware transistor failure or broken circuit trace. Software tools cannot restore an unpowered dead pixel, and resolving it usually requires hardware panel replacement under warranty.
Some stuck pixels may respond to rapid RGB color-cycling or pixel stimulation tools like our Stuck Pixel Fixer, which attempts to stimulate liquid crystal molecules back into normal operation. However, recovery is not guaranteed.
A dead pixel itself does not spread to neighboring pixels because each transistor is an independent circuit. Additional defects only appear over time if the panel suffers from broader physical stress, voltage surges, or manufacturing degradation. Learn more in our guide on whether dead pixels can spread.
Yes. Displaying fullscreen static solid colors is completely safe for all display panels, including LCD, IPS, VA, LED, and OLED screens.
No. The entire diagnostic suite operates 100% inside your standard web browser with zero software downloads, extensions, or account signups required.
A full visual screen test across all primary RGBW backgrounds takes approximately one to two minutes.
Yes. Surface dust particles frequently look identical to dead pixels when viewed head-on. Try our interactive Parallax Test or tilt your head: dust shifts with viewing angle, while dead pixels remain locked on the subpixel grid.
Yes. Retail return windows (usually 14–30 days) allow hassle-free replacement for even a single dead pixel. In contrast, manufacturer warranties often require several defective pixels under ISO 9241-307 class guidelines before approving an RMA claim.
Display Technology & Troubleshooting Blog
Read our latest research and expert guides on screen calibration, monitor manufacturing, and display troubleshooting.
Why Does My Monitor Look Blurry? 9 Common Causes and How to Fix Them
Learn why your monitor may look blurry and how resolution, scaling, refresh rate, cables, graphics settings, and text rendering can affect display clarity.
Read Full Guide →
Bought a New Monitor? 10 Things to Check Before Your Return Window Ends
Just bought a new monitor or laptop screen? Use this quick display inspection checklist to find dead pixels, refresh-rate issues, backlight bleed, resolution problems, and other display defects before your return window expires.
Read Full Guide →
Can a Dead Pixel Spread? What Really Happens When One Pixel Fails
Learn whether dead pixels can spread, why additional pixel defects may appear, and when multiple display problems could indicate a larger hardware issue.
Read Full Guide →
What Causes a Dead Pixel? Understanding the Problem and Its Solutions
Learn what causes dead pixels on digital screens, how dead and stuck pixels differ, whether software can fix them, and prevention tips.
Read Full Guide →
How to Test, Detect, and Fix Dead Pixels: Ultimate Guide
Learn how to test your monitor, laptop, or smartphone for dead and stuck pixels using DeadPixelTests.com. Discover quick physical and software fixes.
Read Full Guide →
Dead Pixel – What Are The Main Reasons For Its Appearance?
Discover why dead and stuck pixels appear on monitors. Explore how manufacturing errors, environmental conditions, and shipment stress affect display durability.
Read Full Guide →Browser-Based & Privacy-Focused
Dead Pixel Test is engineered with privacy as a foundational principle. All screen diagnostic routines—including fullscreen color rendering, resolution detection, refresh rate measurement, webcam hardware checks, and checklist reports—are executed 100% client-side inside your browser's local memory. No screen content, webcam feeds, audio data, or device identifiers are ever transmitted to or stored on external servers.