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All Black Screen is a free online tool that turns your screen completely black—or any solid color you choose—in one click. Ideal for safely cleaning your monitor, testing display quality, detecting dead pixels, and checking for backlight bleed. Supports preset colors like white, red, green, blue, yellow, orange, pink, and purple, along with custom hex colors. Works instantly on desktops, laptops, tablets, and mobiles—no downloads or signups required.