Audio Mixer plays two or more audio files at the same time and saves them as one file. Each track has its own volume (0–200%) and start time, so you can lay a voice over background music, add sound effects to a recording, or blend two songs. Everything runs in your browser and nothing is uploaded.
How to mix audio
- Choose two or more files: MP3, WAV, M4A, FLAC, OGG, or the sound of a video.
- For each track, set the Volume and the time it Starts at (m:ss).
- Choose the Length: until the last track ends, or as long as the first track.
- Pick a Fade out at the end if you want the mix to end softly.
- Choose the format under Save as, click Mix, listen, then Download.
Typical settings
| You want to | Track 1 | Track 2 |
|---|---|---|
| Voice over background music | Voice 100%, starts 0:00 | Music 25%, starts 0:00 |
| Music intro, then a voice | Music 40%, starts 0:00 | Voice 100%, starts 0:05 |
| Add a sound effect at one moment | Recording 100% | Effect 80–120%, starts at that moment |
| Blend two songs | Song A 70% | Song B 70% |
Use Same as the first track for the length when the first track is the main recording, so a long music file does not run on after it ends.
Mixing versus joining
- Mixing (this tool) plays files at the same time: the result is as long as the longest track.
- Joining plays them one after another: use Audio Joiner or Merge MP3 for that.
Good to know
- Files with different sample rates are converted to the highest one before mixing. Mono tracks are placed in both channels.
- Turning a track above 100% makes it louder; if the sum gets too loud, the peaks are rounded off softly rather than clipped.
- To put music on a video instead, use Add Music to Video. To shorten a track first, use the Audio Cutter.
Private by design
Your audio is processed on your own device and never uploaded. See how it works.