AudioBookConverter converts MP3 audio into M4B audiobooks, building on an earlier freeipodsoftware release.
Open source
AaxAudioConverter
AAX Audio Converter converts Audible AAX files to MP3 or M4A/M4B and provides basic support for older AA files.
About AaxAudioConverter
AAX Audio Converter is a free, open source Windows application that converts Audible audiobooks in the proprietary .aax format to plain .mp3 or .m4a/.m4b files. It also offers basic support for older .aa files. The project is hosted as a GitHub repository, and the Windows setup package is listed as version 1.18.2.
The application offers several processing modes. Each input file can produce one output file, or be split by chapter, or be divided into shorter tracks of roughly equal length, with or without respecting chapters. It keeps meta-tag information, including chapter metadata, and can adjust inaccurate chapter marks. Audio processing, including DRM handling, is carried out by the bundled FFmpeg tool. Use requires a download method or activation code tied to the user's own Audible account, and the application runs only on Windows.
Key features
- Converts Audible .aax files to .mp3 or .m4a/.m4b
- Basic support for older .aa files
- Multiple processing modes, including splitting by chapter or into equal-length tracks
- Preserves meta-tag information, including chapter metadata
- Adjusts inaccurate chapter marks
- Parallel conversion across all available processor cores
Best for: Windows users who want to convert their own Audible .aax audiobooks to MP3 or M4A/M4B files.
Good for
- Free and open source software
- Preserves meta-tag and chapter metadata during conversion
- Supports books with more than 255 chapters and very long books
Watch out for
- Runs only on Windows, with Windows 10 and above officially supported
- Requires .NET Framework 4.8, and Windows 7 may work only with auto-update disabled
- Requires Book Lib Connect, legacy Audible Manager, or a personal activation code, and legacy Audible Manager is no longer available from Audible directly
AaxAudioConverter at a glance
- Category
- Books & Reading › Audiobooks
- Type
- Open-source project
- Pricing
- Not confirmed. Check the site
- Platforms
- Windows
- Open source
- Yes · Source code
- Language
- English
- Last checked
- Oct 6, 2026 · Online when checked
- Listed
- Oct 5, 2026
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AaxAudioConverter FAQ
Do I need an Audible activation code?
Books downloaded with Book Lib Connect do not need an activation code. If the application asks for one, any code will work. Without Book Lib Connect, the user's personal activation code is needed, and legacy Audible Manager can help the application find it automatically.
Which Windows versions does it support?
It is designed to run on Windows 10 and above. Windows 7 may still work, but only if auto-update is disabled.
What output formats can it produce?
It converts files to plain .mp3 or to .m4a/.m4b.
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