The AA file format is short for Audible Audio which is a propriety MP4 audiobook format provided by Audible.com. And aa file is protected by DRM (Digital Rights Management) encryption which keeps them from being played freely.
AA file can only be played on certain devices such as Kindle, but not support other mobile MP3 devices. Why? Because aa files purchased from iTunes are DRM protected. If you want to play aa files on any mobile devices you got, first thing you need to do is to remove DRM from aa files and convert aa files to MP3 format.
Firstly, it can remove DRM-protection easily and convert aa files to MP3 lawful. Secondly, this AA to MP3 converter can keep chapters of the original audio with AAC output format. What's more, it can split the file with different methods, such as the duration, the number of the segments or chapters.
Download the Macsome Audio Book Converter installation package and install it. The following article offers you a step-by-step guide on how to convert AA files to MP3 on Mac.
Tips: This is just a trial version with the limitation that it can only convert 3 minutes each audiobook. You can get full version after you purchase it.
Step 1: Import the aa files to the Converter for converting
The software loads all playable audiobooks from the iTunes Books library automatically. You can select the files you want to convert.
Step 2: set the output format
Click Profile button and select the required output format in Output File Format drop-down list.
Step 3: Set the output path.
Click the Macsome AudioBook Converter menu and select Preferences to customize the Output Settings by clicking Choose... to set the destination.
Step 4: Start the aa files to MP3 conversion
Click the Convert button at the lower right corner of the main interface to start converting Audible aa files to MP3.