# Audio Joiner

An audio joiner that merges MP3 and other files end to end in the order you set. Mismatched sample rates are matched up. Nothing is uploaded.

Canonical page: https://filetity.com/audio-joiner

## Capabilities

- Free: Yes, with no watermark and no page limit.
- Account required: No. There is no account system.
- Processed on device: Yes. The file is read by your browser and never uploaded. There is no server to send it to.
- Formats: MP3, M4A, WAV, OGG, FLAC and AAC in, mixed freely. MP3, M4A, OGG or WAV out.
- Limits: Files are joined end to end with no gap and no crossfade. There is no cap on how many, but the finished file is held in memory before you save it.
- Mobile: Yes, on any modern mobile browser. Large files are limited by the memory the phone gives the browser.
- Offline: Yes, once the page has loaded. The tool keeps working with no network connection.

## Questions

### What if my files have different sample rates?

They are all brought up to the highest one present, and the page names which files are being changed before it runs. Raising a rate costs a few bytes and loses nothing; lowering it would throw away material from the better files to match the worst one, which is the wrong way round.

### Can I control the order?

That is the point of the list. Files arrive in whatever order the picker handed them over, which is rarely the order you want for chapters or takes, so each row has arrows to move it and the join follows the list exactly as shown.

### Is there a gap or a crossfade between files?

Neither. Each file starts exactly where the previous one ended. If you want a pause between tracks it has to be in the files themselves, and if you want a crossfade this is the wrong tool: that needs an editor that can overlap and fade two regions.

### Can I mix formats in one join?

Yes. Drop MP3s, WAVs and M4A files together and pick one output format; each is decoded on the way in, so what they arrived as makes no difference to the result. This is the usual case when the pieces came from different devices.

### Do the track names or tags survive?

No, and they cannot: the output is one continuous track, so there is nowhere for six separate titles to go. What you get is a single file with a single name, which is the point of joining, and you can tag it afterwards in a music library if that matters.

## Related tools

- [MP3 Cutter](https://filetity.com/mp3-cutter): Cut an MP3 or any audio file down to the part you want.
- [Video to MP3](https://filetity.com/video-to-mp3): Pull the soundtrack out of a video and save it as MP3.