Layer multiple audio tracks simultaneously. Easily add background music to voice recordings and adjust the volume of each track with zero server uploads.
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Drop Audio Files to Mix
Layer background music over vocals perfectly offline.
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Track Mixer
Preview Mix
Rendering Mix...
The Easiest Way to Mix Audio Files Online
Whether you are trying to add a soft instrumental beat behind a meditation voiceover, or mix a backing track with your own vocal recording, combining audio files simultaneously used to require complex software like Adobe Audition or GarageBand.
Our Free Audio Mixer simplifies this process completely. It acts as a digital mixing board directly in your browser. You can layer multiple audio tracks on top of each other, precisely control the volume percentage of each individual file, and export a perfectly blended master track.
100% Private, Zero Uploads: Because vocal recordings and unreleased music are highly sensitive, our mixer is built using Client-Side architecture. Your audio is decoded, layered, and rendered locally using your device's memory. We never upload your tracks to an external server.
How to Add Background Music to a Voice Recording
Mixing a professional-sounding track is all about balancing the volume levels. Follow these simple steps:
Upload Your Tracks: Drop your vocal recording (e.g., an MP3 or M4A) and your background music into the tool. You can mix 2, 3, or even more tracks together.
Adjust the Volumes: By default, all tracks play at 100% volume. To prevent the background music from overpowering the vocals, lower the music track's slider to roughly 20% - 30%, and leave the vocal track at 100%.
Live Preview: Click the "Play" button. The tool will play all the tracks simultaneously. You can adjust the volume sliders in real-time as the audio plays to find the perfect blend.
Render and Download: Select your export format (MP3 or WAV) and click "Mix & Download." The tool will instantly merge the layers into a single, continuous audio file.
Frequently Asked Questions
Yes. Our multi-track audio mixer is entirely free. There are no paywalls, no monthly subscriptions, and no limits on file sizes.
Absolutely. Our Web Audio engine normalizes all file formats automatically. You can seamlessly layer an M4A voice note, an MP3 beat, and a WAV sound effect.
No. Your privacy is our priority. The entire mixing process happens offline, locally inside your web browser. Your files never touch our servers.
The final exported file will match the duration of your longest track. For example, if your voice note is 1 minute and your background music is 3 minutes, the final file will be 3 minutes long.
Yes. If one of your tracks is very quiet, you can use the slider to boost its specific volume up to 200% before mixing it with the other tracks.
Yes! The tool is completely mobile-responsive. You can easily select files from your phone, adjust the volume sliders with your touchscreen, and export directly to your mobile device.
No. The internal rendering engine uses lossless floating-point math to blend the sounds. If you export as a WAV file, you get a perfect lossless mix. If you export as an MP3, we use a high-quality 192kbps bitrate.
Yes! You can drop an MP4 video file into the mixer. It will extract the audio track from the video, allowing you to layer it with other MP3s or voice notes.
There is no hard software limit. You can mix 5 or 6 tracks simultaneously, though performance depends entirely on your device's available RAM (memory).
No. Once the tool page has loaded in your browser, you can disconnect from the internet and use the mixer entirely offline.
