A white screen serves as a light source. For portrait photos, use a bright white screen. A white screen was used to test the display. White Screen is your 100% free web-based bright screen tool for testing screen brightness levels across devices like mobile phones, laptops, desktops, iPads, and iPhones. This is the simple white & black screen. The Blank White Screen tool offers a versatile, bright white background for numerous uses. Perfect for white screen monitor testing, drawing assistance, tracing on a blank white page,