LightScreen

LightScreen turns any device with a browser into a portable light source. Pick a color, and your screen becomes a bright fullscreen light—use it as a screen flashlight, an instant reading light, ambient mood lighting, or red light for stargazing.

For more control, LightScreen includes adjustable brightness (0% to 100%) and multiple lighting modes such as breathing, RGB cycle, traffic-light blinking, police-light style effects, and a spectrum/white-blue blink option. You can also choose dedicated effects like Green-Yellow-Red, ring-light style lighting, and Zoom lighting for a quick fill-light feel without needing a camera.

You can also use LightScreen for display checks. A screen test page auto-cycles through colors to help spot dead pixels, light spots, and backlight bleed, and it includes clear solid-color screens (useful for quick calibration and uniformity checks).

LightScreen is free, runs in your browser, and requires no download or account. It’s available for monitor testing, late-night reading, photography-style fill lighting, meditation ambience, and night-vision-friendly red light use.

What is LightScreen?

LightScreen is a free fullscreen browser tool that fills your screen with chosen light colors and effects, turning your device into a flashlight, ambient light, or night-light style display.

How do I use LightScreen as a flashlight?

Open LightScreen, choose a light color, and adjust brightness with the 0% to 100% slider to act like a steady screen flashlight.

Is LightScreen free to use?

Yes—LightScreen is free to use and runs directly in the browser.

Can I adjust brightness, and what range is available?

Yes. LightScreen lets you adjust brightness from 0% to 100% for your selected light effect.

What is the breathing mode?

Breathing mode is an animation that gently pulses the light color, creating a calmer ambient effect rather than a static fill.

How do I test my monitor for dead pixels and backlight bleed?

Use the Screen Test tool, which auto-cycles through colors to help reveal dead pixels, light spots, and backlight bleed.