Dead Pixel Checker
Select a color or press Start Check, then tap the screen to cycle through colors and inspect for dead or stuck pixels.
What to do if you found a pixel issue
No issues found — screen is healthy
No action needed. Run this check again after a few months or if you notice any visual anomalies during normal use.
Found a stuck pixel (shows one fixed color)
Stuck pixels are sometimes fixable. Try running a pixel-fixing tool that rapidly flashes colors in that area for 10–30 minutes. Gently massaging the area with a soft cloth while the screen is off occasionally helps too. If it persists after a few attempts, treat it as a dead pixel.
Found a dead pixel (permanently black dot)
Dead pixels cannot be fixed at home. If your display is under warranty, most manufacturers have a dead pixel policy — check how many pixels are required before a replacement is issued. Document the location with a photo before contacting support.
Found backlight bleed or clouding
Backlight bleed appears as uneven brightness or glow around edges on dark backgrounds — most visible on the black screen test. This is common in LCD panels and is usually cosmetic. Severe bleed may qualify for a warranty replacement depending on the manufacturer’s policy.
What Does Dead Pixel Checker Detect?
Dead Pixel Checker is a free browser-based tool that fills your entire screen with solid colors to help you spot faulty pixels on any display. A dead pixel appears as a permanently black dot, while a stuck pixel stays fixed on one color — red, green, or blue — regardless of what is on screen. This tool requires no software installation and runs entirely in your browser using standard fullscreen display rendering, making it a fast and reliable way to perform a screen defect test on any device.
Supported Screens and Displays
This tool works with every type of modern display including LCD, LED, OLED, and AMOLED panels. It supports desktop monitors, laptop screens, tablets, and smartphones from all major brands including Samsung, LG, Dell, Apple, ASUS, Lenovo, HP, and more. Because the checker runs in the browser, it is fully compatible with any screen that can open a modern browser — no drivers, plugins, or additional hardware required for pixel testing.
How To Use This Tool
Open the tool and select a color from the five available options — black, white, red, green, or blue — or press Start Check to enter fullscreen mode immediately. Once in fullscreen, tap or click the screen to advance through each color one by one. Move your eyes slowly across the entire display looking for any dot that does not match the current color. Use the Auto-Cycle option to let the tool switch colors automatically. Press Escape or the close button when your screen inspection is complete.
Understanding Your Results
A healthy display will show a perfectly uniform color across every pixel with no visible spots, dots, or discoloration. If you notice a small black dot during the white or bright color screens, that is likely a dead pixel which cannot be repaired. A dot that shows a fixed color — such as a bright red or green speck — during unrelated color screens indicates a stuck pixel, which can sometimes be fixed using pixel refresher techniques. Any screen defects you find can help you decide whether a monitor repair or replacement is needed.
Frequently Asked Questions
Q: What is the difference between a dead pixel and a stuck pixel?
A: A dead pixel is permanently black and receives no power. A stuck pixel is frozen on one color — usually red, green, or blue — and may sometimes be corrected.
Q: Can this tool fix dead pixels?
A: No, this tool only helps you detect dead or stuck pixels. It does not repair them — you would need a separate pixel-fixing tool or professional screen service for that.
Q: How do I know if my screen has a dead pixel?
A: Cycle through all five colors on a clean full screen. Any dot that does not change with the background color is likely a dead or stuck pixel.
Q: Does dead pixel checker work on phones?
A: Yes, the tool works on any smartphone browser. Open it in Chrome or Safari, tap Start Check, and inspect your phone screen in fullscreen mode.
Q: Is it safe to run a dead pixel test on my monitor?
A: Completely safe. The tool only displays solid colors on your screen and does not interact with any system files, hardware settings, or display drivers.
Q: How many colors should I test with?
A: Test with all five colors — black, white, red, green, and blue. Some pixel faults only show up against specific colors, so checking all of them gives you the most accurate result.
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