Audible's .aa file format encapsulates sound encoded in either MP3 or the ACELP speech codec, but includes unauthorized-playback prevention by means of an Audible username and password, which can be used on up to four computers and three smartphones at a time. Licenses are available for schools and libraries.
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Audible's content can only be played on selected mobile devices. Its software does enable users to burn a limited number of CDs for unrestricted playback, resulting in CDs that can be copied or converted to unrestricted digital audio formats.
AAX files are encrypted M4B's. The audio is encoded in variable quality AAC format. While the vast majority of books are encoded at 64 Kbps, 22.050 kHz, stereo, some are as low as 32k, mono. Radio plays are often encoded at 128kbps and 44.1 kHz. Additionally, many audiobooks in Germany are encoded at the latter bitrate and are marketed as 'AAX+'; however, there is no difference in the actual file format.
Most AA / AAX from Audible.com are protected, that is to say, users can freely play these AA / AAX audio files on most audio player. If users can convert AA / AAX to MP3 format, there is no need to worry about the limitations of AA and AAX anymore.
Steps to use iTunes Converter to convert AA / AAX to MP3
Convert Aac File To Mp3
Here we use Macsome iTunes Converter(Win | Mac) to convert audiobooks from AA / AAX to MP3. Through the conversion, users can also keep audiobook's chapters when you convert to AAC format. Since it doesn't support the split function, which will be added in the future.
First, free download the software according to your computer system, and install it on your computer.
Then run the iTunes Music Converter, and choose the Audio book files you want to convert from the iTunes Books library.

Please make sure that you have authorized the purchased Audiobooks to the device or the computer so as to play them normally.
And now click Profile button and select the required profile in Output File Format drop-down list.
You can also click the software menu and select Preferences to customize the Output Settings by clicking Choose... to set the destination.
Finally, click the Convert button to start the conversion. Meanwhile the paid Audiobook's limitation is removed as well.
After the conversion is done, you can play the converted audiobook files on any MP3 or other audio players as you like.
Summary
Audible books giving us more and more enjoyments to listen to audiobook during our daily life. After we purchased them from Audible.com, even we can play them via iTunes after we authorize it. If you want to play them on your MP3 player and so on, the primary audiobook AA, AAX files can be transferred.
If you try to use iTunes Music Converter to record the Audiobook to MP3 format, and transfer the recorded MP3 files to your MP3 player, now you can play them anytime.
After downloading audiobooks from Audible, you find Audiobooks in AAX format can be recognized by your audio player. In this case, I’d like to offer you 2 best AAX to MP3 converters that can convert AAX file to MP3 free. Need to upload audiobooks to YouTube? Try MiniTool Video Converter to convert Audiobook to video for free!
When you download an audiobook from Audible, you are trying to play it with your own audio player. Then you find the audio player does not support AAX format.
What is AAX? How to open AAX file on your device? AAX is an audiobook format developed by Audible. To open the AAX file, you can use an audio converter to convert AAX to MP3. Or open AAX file with a powerful media player like VLC Media Player.
The following parts will show you 2 best free methods to convert AAX to MP3.
Method 1. Convert AAX to MP3 with AAX Audio Converter
Compatibility: Windows 7 and above
AAX Audio Converter is an open-source tool that lets you convert AAX to MP3, M4A or M4B for free. It can keep and manage all meta-tag information, and correct inaccurate chapter marks.
However, a personal activation code is required when processing AAX files. To get this code, you need to install and activate the Audible App or Audible Manager first.

Here’s a guide on how to convert AAX to MP3.
Step 1. Download AAX Audio Converter setup package from GitHub, and install the program on the computer.
Step 2. Start AAX Audio Converter
Step 3. Click the Add button to import the AAX file you want to convert. Or drag and drop AAX files in the AAX Audio Converter window.
Step 4. MP3 format is checked by default. If you need to convert AAX to M4A, you can check the M4A option in the Format tab.
Aae To Mp3
Step 5. Then you can edit or add meta information in the Naming tab.
Step 6. Once you are done, choose the AAX files and click on Convert to export AAX to MP3.
You might be interested in this post: Top 4 Audiobook Players for Listening to Audiobooks
Method 2. Convert AAX to MP3 with inAudible
Compatibility: Windows and Mac
Another free AAX to MP3 converter is inAudible. It’s capable of removing DRM from AAX files and can convert AAX files to other popular formats such as MP3, FLAC, M4B, M4A and more. It can run on both Windows and Mac.
Below are the detailed steps on how to convert AAX file to MP3 free.
Step 1. Go to GitHub and find the Installer of inAudible.
Transfer Audible Book To Mp3 Player
Step 2. Click the Windows or Mac installer link and you will be taken to the Pirate Bay site.
Step 3. Click on GET THIS TORRENT to copy the magnet link and open the link with an online torrent player.
Step 4. Then download and install the program on your computer.
Step 5. Launch it and load the AAX files.
Step 6. Select the MP3 output format.
Step 7. Finally, start the AAX to MP3 conversion.
Conclusion

The above-mentioned AAX to MP3 converters are 100% free. You can use them to convert AAX file to MP3 freely.
If you have better methods to convert AAX to MP3, please share them in the comments area!