DEAD PIXEL TEST
Dead pixels stay BLACK on all colors • Best detected on WHITE
Dead Pixel Test Online
What is a dead pixel test?
A dead pixel test is a screen diagnostic tool that displays solid colors across your entire display to help you identify pixels that are not functioning correctly. Dead pixels appear as black dots that stay black regardless of what color is shown on screen. This test cycles through white, black, red, green, and blue backgrounds so you can spot any pixel that doesn't change color as expected.
Who is this for?
- • Testing a new monitor before your return window closes
- • Checking a second-hand laptop or TV before buying
- • Diagnosing screen issues on your current device
- • IT professionals verifying multiple screens quickly
- • Fixing dead pixels (this tool only helps identify them)
- • Professional display calibration
- • Official warranty claims (contact your manufacturer)
How to test for dead pixels
- 1. Clean your screen — Wipe away dust and smudges so you don't mistake debris for dead pixels.
- 2. Click "Start Test" — The tool will enter fullscreen mode.
- 3. Watch the colors cycle — 5 solid colors will appear automatically: white, black, red, green, blue.
- 4. Look for stuck dots — Pixels that stay black on all colors are dead. Pixels that stay one color (e.g., always red) are stuck.
- 5. Press Space or tap — Switch colors manually if you need more time.
- 6. Press Escape — Exit fullscreen when done.
Tip: Test in a dimly lit room and view from your normal sitting distance. Dead pixels are easier to spot on white and black backgrounds.
When to Use This Test
Testing a New Monitor
You just bought a new monitor. Test it immediately so you can return or exchange within the retailer's return window (usually 14-30 days).
Checking a Second-Hand Device
You're buying a used laptop or TV. Run this test on the spot before handing over money.
Warranty Claim Preparation
Before contacting your manufacturer, use this test to identify and document dead pixel locations.
Diagnostic Tools
Dead Pixel Test
Detect permanently black pixels that fail to illuminate.
Backlight Bleed Test
Detect light leakage from screen edges in dark environments.
Stuck Pixel Test
Identify pixels stuck on a specific color (often white or bright).
LCD Test
Comprehensive LCD panel health and uniformity inspection.
Screen Test Guide
Complete testing knowledge hub with FAQ and procedures.
Important Limitations
- •This tool helps identify potential dead pixels but cannot guarantee detection of all pixel defects.
- •Results may vary based on screen type (LCD, OLED, IPS), resolution, and viewing angle.
- •This is a visual test — your eyes and lighting conditions affect results.
- •For definitive diagnosis, consult your device manufacturer or a professional technician.
Your Privacy Matters
Security & Privacy
Frequently Asked Questions
Is this dead pixel test free?+
Yes, completely free. No download, no signup, no credit card required.
How accurate is this test?+
The test displays pure solid colors across your entire screen. Dead pixels become visible as dots that don't change color. For best results, clean your screen first and test in good lighting.
Can dead pixels be fixed?+
Dead pixels (permanently black) cannot be fixed and require screen replacement. Stuck pixels (showing one color) may sometimes be revived with software tools or gentle pressure methods.
Will this work on my TV?+
Yes, if you can open this page in a web browser on your TV. Navigate here and run the test in fullscreen.
How many dead pixels are acceptable?+
Most manufacturers require 3-5 dead pixels before warranty replacement. Check your manufacturer's specific dead pixel policy.
What's the difference between a dead pixel and a stuck pixel?+
A dead pixel appears black (permanently off). A stuck pixel shows a fixed color (red, green, or blue) and may be fixable.