How to join audio files
- Drop two or more audio files on the box above. You can add more later.
- Use the up and down arrows to set the order. The cross removes a file.
- Under Between files, choose Join directly, Add silence or Crossfade.
- Pick a format and press the join button.
- Download the combined file.
Between files
| Choice | What it does |
|---|---|
| Join directly | The next file starts the moment the last one ends. |
| Add silence | Inserts 0.5, 1, 2 or 3 seconds of silence between files. |
| Crossfade | The end of one file fades out while the next fades in. The total gets shorter by the overlap. |
Tips
- Files with different sample rates or channel counts are matched for you.
- For music mixes a 1 to 3 second crossfade sounds smooth. For podcast parts, a short silence works better.
- Check the total length shown above the join button before you save.
- Save as WAV if you will edit the result again.
Limits
All files are decoded in memory at once, so joining many long recordings needs a lot of memory. The tool does not match the loudness of different files. We tested desktop Chrome only.
Privacy
Your audio never leaves your device. There is no upload, no account and no watermark.
FAQ
How do I merge MP3 files into one?
Drop all the MP3 files, order them with the arrows, choose Join directly, pick MP3 as the format, and press join.
Can I join different formats?
Yes. You can mix MP3, WAV, M4A and other formats your browser can read. The output uses the format you choose.
Will there be a gap between files?
Not with Join directly. In our test, a 3 second and a 2 second file joined to exactly 5 seconds.
What does crossfade do to the length?
The files overlap, so the result is shorter. A 3 second and a 2 second file with a 1 second crossfade came out at 4 seconds.
Can I change the order after adding files?
Yes. Use the up and down arrows next to each file. Your format and gap settings stay as they are.
Are my files uploaded?
No. Everything runs in your browser.