Auto-Ducker (Sidechain)

Free Auto-Ducking Tool

Automatically balance your voiceovers and background music with professional sidechain compression directly in your browser.

What is it?

Auto-Ducker is a smart audio processing tool that utilizes a technique called sidechain compression. When you mix a voice recording with background music, the background music can often overpower the voice, making it hard to hear. This tool intelligently "listens" to your voice track. Whenever it detects you speaking, it instantly lowers (ducks) the volume of the background music. When you stop speaking, the music smoothly returns to its original volume. All of this happens instantly and securely within your web browser, with zero server uploads required.

How to use it?

First, upload your main voice track in the left panel. Then, upload your background music in the right panel. The tool will automatically sync them. You can adjust the "Voice Threshold" (how loud the voice needs to be to trigger the effect) and "Music Reduction" (how quiet the music should get). Use the "Preview Mix" button to listen to the result in real-time. Once the balance sounds perfect, click "Render & Download" to save your professionally mixed .wav file.

Who uses this tool?

This tool is a staple for podcasters, YouTube video creators, audiobook narrators, and anyone who needs to quickly mix spoken word audio with a musical bed without spending hours manually automating volume levels in a complex editing program.