ScreenWhite

Overview

ScreenWhite is a free web tool that turns a display into a full-screen pure white canvas in one click. It is primarily used as a fill light for video calls, as a light table for tracing, and for spotting dead pixels. The screen paints instantly, with adjustable brightness and color temperature. Users can also enable a keep-awake mode or download the white image as a PNG, JPG, or WEBP file up to 8K. No sign-up, no watermark, and no storage make this an easy resource for creators, photographers, and technicians.

Key Features

• Instant full-screen white view: The color is embedded as an inline style in the HTML, so the browser paints a white screen before any stylesheet or script runs. Pressing the Full screen button or F key fills the display and hides all interface elements.
• Brightness and color temperature sliders: Users can adjust brightness from 10 to 100 percent and color temperature from 2000K to 9000K. The sliders recompute the actual color, rather than applying a filter over the screen, preserving the legibility of on-screen controls.
• Keep awake with Screen Wake Lock API: A toggle requests a wake lock from the operating system, preventing the display from falling asleep while the tab is visible. The wake lock is released automatically when leaving the page or hiding the tab.
• Download panel with many output options: The page can generate white PNG, JPG, and WEBP images in sizes from a 1x1 pixel to 7680x4320 (8K). PNG files are generated server-side as one-bit palette images, which keeps even very large downloads under a few kilobytes.
• Timer and direct links: A built-in timer can be set from one minute to an hour, and direct links to white images such as /image/white-1920x1080.png or /image/white-3840x2160.png allow instant access without opening the download panel.
• Embeddable iframe and custom color pages: ScreenWhite provides a lightweight embed code, like <iframe src="https://screenwhite.app/embed/white" width="100%" height="420">. Any hex color can also be addressed via /screen/{hex} to produce a specific shade on any device.

How It Works

Visiting the homepage opens a pure white preview with controls below it. The Full screen button activates an immersive view, removing all other page elements until the Escape key is pressed. Brightness and warmth can be adjusted using range sliders, and changing the values updates the screen live. If Keep awake is enabled, the browser requests a wake lock to protect the display against sleep. For a downloadable image, the user opens the Download panel, selects a format and a size, and the image is generated and saved immediately. No data is uploaded, and the only state the page uses lives in the URL, so sharing a link reproduces the exact configuration.

Who It's For

The tool serves anyone who needs a bright, blank display. Content creators can use it as a soft fill light during video calls, designers and craftspeople can trace patterns on a tablet, and IT staff or panel testers can use the white screen to inspect displays for dead pixels or uniformity issues. Since no installation or account is required, it is also a convenient fallback for teachers, photographers, and presenters who need a solid white backdrop on any device and in any browser.