ScreenWhite

Overview

ScreenWhite is a free web utility that turns a display into a pure white surface with one click. It serves multiple practical roles: providing soft fill light for video calls, acting as a backlight for tracing, revealing dust and dead pixels on monitors, and offering a pristine background for content capture. The site also bundles adjacent tools for popular colors, screensavers, and monitor tests. Because it runs entirely in the browser, there is no installation, account, or upload.

Key Features

• Fullscreen white mode: A single click or pressing the F key hides the entire browser interface and paints the full display white until Escape is pressed. The background color is loaded in the HTML, ensuring no flicker before the page renders.
• Brightness and warmth controls: Two sliders let users modify the white light from 10% to 100% perceived brightness and from 2000K (amber candlelight) to 9000K (cool daylight). The controls recalculate the true RGB value in the browser rather than overlaying a filter.
• Keep awake toggle: When activated, the page requests a Screen Wake Lock, preventing the operating system from dimming or sleeping the display during an active session. The lock is released automatically when the tab is closed or hidden.
• Downloadable images: The download panel generates solid white PNG, JPG, or WEBP files at presets such as 1080p, 2K, 4K, 8K, square, mobile, or even a single 1×1 pixel. PNG images are encoded on the server as one-bit palette files, making an 8K PNG about 4 KB.
• Timer for auto-exit: A dropdown timer can force the fullscreen session to end after one minute up to one hour, useful for unattended setups.
• Embeddable iframe: A copyable snippet lets website owners embed a live white screen block, synchronized with the site's color and interaction.

How It Works

When a user navigates to the white screen page, the HTML carries an inline background style, so the white field paints immediately during the first frame. Clicking the fullscreen button invokes the browser Fullscreen API, expanding the screen area. The brightness and temperature inputs recompute the hex color in real time, and the download feature uses either a tiny server-side PNG writer or client-side encoding for JPG/WEBP. For those who need an exact shade, the platform supports direct loading of any hex color as a screen by appending the code to the URL.

Who It's For

The tool is designed for video conference participants who need flattering fill lighting, illustrators who trace paper on a tablet, technicians inspecting panels for dead pixels or uniformity, and photographers checking lenses for sensor dust. It is equally useful for teachers, streamers, and IT support personnel who require a clean solid-color background quickly. Since no data collection or login occurs, even privacy-conscious users can deploy it in a pinch.