Current Issues

Version 9.0.0 released June 26, 2026.

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Pertinent change considerations from older versions

The Music app does not support "m4b" audiobook files.

The Music app does not allow a playlist to be dragged out of the app; only tracks can be selected and dragged.

Apple Music downloads (files with the extension ".movpkg") are essentially "protected" and cannot be joined

The Books app does not allow tagging, although it will read a file's metadata for Artist (book author) and Album (book title).

General Topics

Are there file size limits?

I've successfully tested joining files up to twenty-two hours in length (the final file size of which is ridiculously large; it was literally a "Moby Dick" audiobook). Things may get a little bumpy during the "Finishing Export" stage on very long joins. Your mileage may vary. I don't recommend exporting hours of audio as a single ALAC, which will be encoded at a higher bit rate and create a commensurately larger file.

Is there a Best Settings you can recommend?

For music I don't encode music lower than 128 kbps@44.1 Stereo; for voice, 64kbps Mono at 22.0 or 44.1 is fine. But ultimately it's a subjective decision and whatever you think sounds good is fine.

Downcoding and Upcoding (Upsampling) Recommendations

You probably shouldn't upcode—that is, don't think you can get higher-quality audio by setting the Output Settings' Bit Rate higher than the source tracks' bit rates. Try to stay near the same bit rate or lower.

Limited audio formats

Currently, only MP3, AAC, Apple Lossless, WAV and AIFF (and AIFC) formatted audio files can be joined. Future updates may accomodate additional formats.

Cloud Sync

Audiobook files do not sync to Cloud Music Library. If you want the files you create with Join Together to sync across your Cloud devices, export them as "Music".

CD Tracks Take A Long Time to Join

Yes. AIFF files from a CD are very big and data on physical CD media takes longer to access than data on a hard drive.

Joining ABJ (Already-Been-Joined) Files

You could try, but I can't enthusiastically recommend it because the additional encoding may result in audio degradation. On the other hand, this may not be as much of a consideration for voice recordings as it might be for music.