Screen Flashlight
Instant fullscreen light with adjustable brightness, night-friendly colors, and emergency blink modes. Everything runs locally in your browser.
Preview
Ready. Press Start to activate light output.
Quick Use Presets
Use these combinations when you need a fast setup. You can still fine-tune brightness and timer to fit your situation.
| Situation | Recommended Setup | Why It Helps |
|---|---|---|
| Power outage, near-field visibility | White, 100%, steady | Maximum screen luminance for finding objects nearby. |
| Night movement without glare | Amber or red, 20% to 40%, steady | Lower glare and less visual strain in dark rooms. |
| Attracting attention briefly | White, 80%, strobe at 5 to 8 Hz | Pulse pattern is easier to notice than constant light. |
| Emergency signaling | White or red, 100%, SOS mode | Uses a standard short-short-short, long-long-long, short-short-short pattern. |
About This Tool
This flashlight tool turns your display into a controllable light source for quick, practical tasks: checking cables under a desk, navigating a dark room, reading labels at night, or giving a visible signal. It is intentionally simple and private. No sign-in, no upload, and no data collection. All behavior is handled by plain JavaScript in your browser.
Brightness is simulated by scaling the selected color toward black. That means your real output still depends on your device panel, brightness setting, battery level, and any power-saving limits. On many phones, this is enough for close range but still weaker than the dedicated LED flash hardware. The fullscreen button helps maximize output by removing browser chrome and using the full screen area.
For longer sessions, the tool includes an optional wake lock request to reduce unwanted screen sleep on supported browsers, plus an auto-off timer to avoid draining battery if you forget it on. Strobe mode uses an adjustable frequency, and SOS mode runs a repeating Morse timing sequence. If you are sensitive to flashing lights, stay in steady mode and avoid strobe.
Use this as a reliable fallback utility. For outdoor distance lighting or safety-critical use, switch to a dedicated flashlight device.
FAQ
Is this as bright as a phone LED flashlight?
No. This lights your display, not the LED flash module. It is best for short-range use.
Can it keep my screen awake?
Yes, on browsers that support the Screen Wake Lock API. If unsupported, normal device sleep behavior applies.
Does SOS follow standard Morse timing?
Yes. The sequence is short-short-short, long-long-long, short-short-short with pauses between symbols and words.
Will this work on desktop monitors too?
Yes. It works on phones, tablets, and desktops. Fullscreen mode is especially useful on larger displays.
Privacy & Limitations
- All calculations run entirely in your browser -- nothing is sent to any server.
- Results are estimates and may vary based on actual conditions.
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Flashlight Screen Tool FAQ
Is this as bright as a phone LED flashlight?
No. This tool lights your screen, not the phone LED flash module. It is useful for close-range tasks and ambient light, but a hardware LED flashlight is much brighter for distance lighting.
Does this tool work offline?
Once loaded in your browser, it can continue working without an internet connection because all controls run locally with JavaScript.
Why use red light mode?
Red light is commonly used at night because it tends to preserve dark adaptation better than bright white light.
Can this keep my screen from sleeping?
The tool can request the Screen Wake Lock API on supported browsers. If your device or browser does not support it, screen timeout behavior depends on system settings.
Is my data sent anywhere?
No. This tool does not upload or store your settings. All calculations and controls stay in your browser.