White Screen

White Screen is a single-purpose web tool that turns your display into a bright, fullscreen white surface. That sounds trivial until you need it: checking a new monitor for dead pixels and backlight bleed, using a laptop screen as a makeshift light for video calls or product photos, cleaning a keyboard without triggering input, or tracing against the screen. Custom background colours and brightness control extend it beyond plain white — you can flip through colours to spot stuck pixels that only show on certain backgrounds. There is nothing to install and no account, which is exactly right for a utility you need for ninety seconds. The honest limits come with the category: it cannot fix a dead pixel, it will not replace a proper photography light for anything serious, and browsers that hide the cursor differently can interrupt the clean fullscreen. As a zero-friction diagnostic and lighting utility that lives in a bookmark, it earns its place.