Audio Joiner merges two or more audio files into a single file: chapters of an audiobook, parts of a recording, songs for a mix. Put them in order, choose straight joins, a crossfade or a short silence between them, and save as MP3, WAV, M4A, FLAC or OGG.
How to merge audio files
- Choose two or more audio files (you can add more later with Add files).
- Put them in order with the arrows; remove one with ×. The list shows each file’s length and the total.
- Choose what goes between them and click Join.
- Listen to the result and download it. It is named after the first file, with -joined added.
What goes between the files
| Option | What you hear | Good for |
|---|---|---|
| Straight after each other | No gap at all | A recording split into parts, chapters |
| Crossfade 1 s | A short blend | Songs in a playlist, smooth transitions |
| Crossfade 3 s | A long, DJ-style blend | Music mixes, background music |
| 1 s of silence | A short pause | Separate clips, voice messages |
| 2 s of silence | A clear pause | Distinct tracks, language lessons |
A crossfade overlaps the end of one file with the start of the next, so the result is a little shorter than the files added together. Silence makes it a little longer.
Mixing different files
Files can be in different formats and from different sources: an MP3, a WAV from a recorder, an M4A voice memo and the sound of a video can all go into one file. The result uses the sample rate of the first file in the list; the others are converted to match. If one file is stereo, the result is stereo, and mono files play on both sides.
Audio Joiner plays the files one after another. To play them at the same time, for example a voice over background music, use the Audio Mixer.
Tips
- Trim first: remove silence or unwanted parts with the Audio Cutter before joining.
- Uneven levels: if one part is much quieter, raise it with the Volume Booster first, then join.
- Best quality in the list first: because the first file sets the sample rate, put a high-quality file at the top.
- Editing later? Save as WAV or FLAC so nothing is lost; make an MP3 at the end.
- Long results: many hours of audio need a lot of memory. On a phone, join a few hours at most.
Private by design
Your files are processed on your own device and never uploaded. See how it works.