Full-screen color test Β· Auto-cycle timer Β· Grid overlay for precise location Β· 8 test colors. No download.
Click Fullscreen Test to fill your entire screen with a solid color. Slowly scan across the screen β any pixel that doesn't match the background is either dead or stuck.
Use Auto-Cycle to automatically advance through all 8 colors at a set interval. Use Grid Overlay to display a reference grid that helps you pinpoint the exact location of a defective pixel.
A dead pixel is permanently black (receives no power). A stuck pixel is permanently lit in one color β usually red, green, or blue. Stuck pixels are more common and can sometimes be fixed by rapidly cycling colors.
This tool fills your entire screen with solid colors to reveal dead, stuck, or hot pixels that would otherwise be hidden by normal screen content. By cycling through black, white, red, green, blue, and other colors in full-screen mode, individual defective pixels become clearly visible against the uniform background.
A dead pixel is always black (all subpixels off β transistor failure). A stuck pixel is always one color like red, green, or blue (one subpixel stuck on). Stuck pixels are often fixable; dead pixels usually are not.
White reveals dead (black) pixels. Black reveals hot (white) pixels. Red reveals missing red subpixels (appear dark on red). Use all colors systematically β some defects only appear on specific color backgrounds.
Industry standard ISO 13406-2 Class II allows up to 2 dead pixels per million. Premium monitors (Dell UltraSharp, etc.) offer zero dead pixel guarantees. Most budget panels allow 5+ dead pixels before warranty replacement.
True dead pixels (black) are usually permanent. Stuck pixels (colored) can sometimes be fixed by rapidly cycling colors or applying gentle pressure. Leave the cycling test running for 1β2 hours for best results.
Click the "Full Screen" button on the test panel. On mobile, the button activates full-screen mode. On iOS Safari, use the "Add to Home Screen" option for a better full-screen experience, as Safari has limited full-screen API support.
Bright spots that appear blurry or larger than one pixel are likely pressure damage or IPS glow β a common phenomenon in IPS panels where backlight bleeds slightly at the corners or edges. This is a backlight issue, not a pixel defect.
Contact your device manufacturer or retailer while under warranty. Document the pixels using the grid overlay to record exact positions. Check your warranty policy β coverage varies from zero dead pixel guarantees to requiring 5+ pixels for replacement.