Play several tracks at the same time: a voice-over over background music, two takes, or sound effects on an ambience. Set each track's volume, when it starts, its fades, and let the music loop until the voice ends.
Audio mixer at a glance
| Price | Free, no sign-up, no watermark, no daily limit |
|---|---|
| Accepts | MP3 · M4A · WAV · MP4 · MOV |
| Largest file | 1 GB per file, several files at once |
| Where it runs | In your browser: files are never uploaded |
| Works on | Any modern browser on iPhone, Android, Windows, Mac and Linux |
| Send the result | Download it, or send it free with a link or by email (up to 20 GB) |
How to use the audio mixer
- Choose two or more audio files (or videos, to use their sound). Put the main track, such as the voice, first.
- For each track, set the volume, when it starts, fades, and whether it loops.
- Choose how long the mix is: until the first track ends, or the longest.
- Press Mix audio, listen, then download the mix or send it with a link.
A voice-over with background music
- Add the voice recording first, then the music.
- Set the music to about −18 dB so the voice stays clear, tick Loop if the music is shorter than the voice, and give it a 3 second fade out.
- Keep “Length: until the first track ends”, so the music stops with the voice.
The loudness of a mix adds up: two tracks at full level can clip. “Prevent clipping” (on by default) runs a look-ahead limiter that keeps every peak at or below −1 dBFS instead of distorting.
What each setting does
| Setting | Effect |
|---|---|
| Volume | −40 to +12 dB for that track (0 dB = unchanged) |
| Starts at | Delay before the track comes in, in seconds |
| Fade in / out | Smooth start and end of that track in the mix |
| Loop | Repeats the track until the mix ends |
Mixed on your device
Every track is decoded, resampled to one rate and mixed in small pieces in your browser, so long mixes work on phones too and nothing is uploaded. Only need clips one after another? Use Merge audio. Putting music under a video? Use Add audio to video.
How this compares
| This tool | Online converters (e.g. Online Audio Converter, Clideo or CloudConvert) | Desktop apps (e.g. Audacity) | |
|---|---|---|---|
| Your file is uploaded | No | Yes, to their servers | No |
| Install or account | None | Account for some features | Install needed |
| Watermark or daily limits | None | Common on free plans | Depends on the app |
Plans of other services change; check their sites. More audio tools.
Frequently asked questions
How loud should background music be under a voice?
Usually 15 to 20 dB below the voice: set the music to about −18 dB and adjust by ear.
Can I use the sound of a video?
Yes. Add an MP4, MOV, WebM or MKV and its sound track is used as a track in the mix.
How many tracks can I mix?
Up to 8 at once.
Will the mix distort?
Not with “Prevent clipping” on: a limiter holds the peaks at −1 dBFS. Lower the track volumes if you hear it pumping.
Are my files uploaded?
No. The mix is made in your browser.
Need to send a big file?
Send files up to 20 GB with a download link or by email. Free, no account needed, original quality.
Send large files free