How to Use MoodLight to Turn Your Screen Into a Party or Mood Light

MoodLight is a free browser-based tool that turns your computer screen into a color-changing light. Open moodlight.org, pick colors or a preset, optionally enable the Mood Detector so the light reacts to sound, then press F11 for full screen. It works on any device with a modern browser and no installation is needed — but skip it entirely if you or anyone nearby is sensitive to flashing lights or has photosensitive epilepsy.

Before You Start

MoodLight displays flashing and rapidly changing colors. The site itself carries a warning: do not use it if you, or others around you, have photosensitive epilepsy or sensitivity to flashing lights. If that applies, close the page rather than experimenting with slower settings.

Beyond that, the requirements are minimal:

• A computer or laptop with a screen (a larger screen gives a stronger effect)
• A modern browser
• A microphone, only if you want the light to react to sound

Step-by-Step: Setting Up Your Light

1. Open the site and go full screen

Go to moodlight.org. Press F11 to enter full screen — this is what turns a browser tab into something that reads as a room light rather than a webpage. Press F11 again to exit.

2. Choose your colors

Use the Colors controls to build the palette you want. You can add individual colors and clear them again with Clear All when you want to start over. This is the manual route: you decide exactly which colors appear.

3. Or start from a preset

If you'd rather not pick colors one by one, use Presets. The available presets are:

Presets are the fastest path to a usable look — pick one, then adjust from there.

4. Turn on automatic color changing

Enable Change Color every 12 seconds to have MoodLight cycle through your chosen colors on its own. This is the setting that makes the screen work as ambient background light while you do something else, rather than something you have to keep clicking.

5. Enable the Mood Detector

Turn on Mood Detector to let the light respond to sound picked up by your microphone. This is the music-detecting behavior the site advertises — useful for parties, or for making the screen pulse along with whatever is playing in the room. Because it listens through the mic, it reacts to ambient sound generally, not just to audio playing on the same computer.

6. Tune brightness, glow, and blend

Three controls shape how the light actually looks:

• Brightness — how intense the output is. Lower it if the screen is uncomfortable to look at directly.
• Glow — softens the edges so colors bleed into each other instead of sitting in hard blocks.
• Blend — controls how smoothly one color transitions into the next.

For a party look, higher brightness with less blend gives sharper, more energetic changes. For a mood or background light, lower brightness with more glow and blend is easier on the eyes over a long session.

7. Share it

The site includes a Tweet option if you want to post what you've set up.

Common Snags

The light isn't reacting to music. The Mood Detector needs microphone access. If the browser blocked the mic prompt, the detector has nothing to listen to — check your browser's site permissions for moodlight.org and allow the microphone, then reload.

Colors change too fast or too slowly. Turn off "Change Color every 12 seconds" and switch manually, or lean on the Relaxing preset, which is built for slower shifts.

The effect looks flat. Add more colors to your palette and raise the Blend value so transitions overlap rather than snapping.

It's uncomfortable to watch. Lower Brightness first, then reduce Glow. If it's still uncomfortable, stop — the flashing-light warning at the top of this article applies.

Quick Reference

The whole setup takes under a minute: open the site, pick a preset or colors, decide whether you want automatic cycling or sound reactivity, adjust brightness and blend, then go full screen.