Use our free fullscreen black screen online for dead pixel testing, backlight bleeding detection, screen burn-in checking, and display contrast testing. Perfect for testing new monitors, laptops, TVs, and phones. Works instantly on all devices.
A fullscreen black screen is an essential tool for anyone who wants to properly test their display. Unlike white screens that show dust and dirt, black screens reveal technical defects that could affect your viewing experience. Many people don't realize their expensive new monitor has issues until it's too late to return it.
Dead pixels show up as bright dots on a black screen. These are pixels that remain illuminated when they should be dark. Testing with black screen helps identify these defects before your return period expires.
Backlight bleeding appears as light leaking from edges or corners on a black screen. Common in LCD displays, this defect is most visible in dark rooms and can be distracting during movies or gaming.
Screen burn-in causes permanent ghost images on your display. Black screen makes these marks visible, especially on OLED screens. Catch burn-in early to prevent it from getting worse.
Black screen helps test how deep your display's blacks really are. Poor contrast means washed-out blacks that look gray instead of true black, affecting image quality in dark scenes.
Backlight bleeding is one of the most common display defects, especially in budget and mid-range monitors. Here's how to properly test for it using our black screen tool.
Some backlight bleeding is normal in LCD screens, especially in the corners. However, excessive bleeding that distracts during movie watching or gaming may qualify for warranty replacement. Check your manufacturer's policies on acceptable levels of backlight bleeding.
While white screens show dead pixels as black dots, black screens reveal "hot pixels" - pixels that stay bright when they should be dark. Both types of defects warrant warranty claims with most manufacturers.
To test for hot pixels, display the black screen at 100% brightness and look for any bright dots that remain visible. These appear as white, red, green, or blue specks against the black background. Count how many you find - most manufacturers require 3-5 defective pixels for replacement, though premium brands may have zero-tolerance policies.