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AAX Audio Converter is an audible aax files to mp3 and m4a/m4b converter. The application requires .Net Framework 4.7.1 to be installed.

Free software
OS: Win
File size: 15MB
Old versions
Version history
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Latest version

1.12 (May 22, 2020)


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Download AAX Audio Converter 1.12  15MB  Win

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Download AAX Audio Converter old versions

Software License

Free software / FOSS (Free download and also Free and Open Source Software)

Supported operating systems


Complete Version history / Release notes / Changelog

Version 1.12

Release Notes
Significant performance boost for MP3 output and "Chapter" mode, due to a modified and enhanced workflow. "Time-split" mode also benefits.
Conversion result message box now includes elapsed time.
Meta data enhancement for MP3 output regarding track duration. Explicit duration is added as pseudo chapter data. Several media players can interpret this. Without it, those media players would estimate duration from the bitrate, with varying readings.
When running under Windows versions below 10, meta data in MP3 output will be downgraded to ID3v2.3. This enables the “Length” column in Windows Explorer on these systems to display MP3 track duration as well. (Windows 10 systems accept ID3v2.4.)
Slightly more log output again.
Fix for finding content_metadata.json if AAX file resided in the top level directory of a drive.
Additional chapter “Performance” in the manual.

Version 1.11

Option to copy original .aax file to a new location with a customizable name after conversion.
Supports long path names (> 260 characters) now for all input and output. It includes all three input methods: open file dialog, drag & drop and double click. It also extends to network drives, mapped and unmapped.
More log output again.
Minor fixes.

Version 1.10

Enhancements for “single file per aax” mode:
Named Chapters, introduced in version 1.7 for chapter modes, now also available for unsplit audio, embedded as markers (M4A/M4B format, not for MP3).
Audio file tailoring, skipping of intro/outro and skipping of continuation hints and repeated opening credits now also applied to unsplit audio.
Title name parsing allows custom order of series and book title for output.
More log output.
Minor fixes.
The installation package now includes FFmpeg.exe version 4.2.2 (was 4.1 before).

Version 1.9

Added a logging facility to track down unexpected behaviour.
Tiny enhancements and a few minor fixes.

Version 1.8

Now also allows .m4b as MPEG4 output, via Basic Settings.
Handling of named chapters with a given length of 0 ms.
A few minor fixes.

Version 1.7

Supports Named Chapters for .aax files downloaded with the Audible App.
Auto-launches the default media player after conversion.
Initial input folder set to Audible App content folder for a fresh installation, if Audible App is present.
New overview chapter in manual on AAX Audio Converter functionality and customization options.
Audiobooks longer than 24 hours now display the correct duration and convert without error.
List of loaded files in main windows now correctly sorts by columns with an underlying numerical value, e.g. file size.
For a multi-part book the program no longer assumes missing parts, although all parts were selected, but the book parts were downloaded with the Audible App.
For a multi-part book, where not all parts were selected, part folders are only created if they will contain at least two files.
Some other minor fixes and adjustments.

Version 1.6

Optional text encoding for .m3u playlist in ISO Latin 1 instead of default UTF8.

Version 1.5

New configurable options (via Basic settings):
Skipping short or very short chapters between book parts, begin and end, settable max. duration.

Version 1.4

New options (via Basic settings):
Extract book meta-info into separate cover image and text file.
Flat folder hierarchy: Combine author and book title into a single folder level.

Version 1.3.1

Release Notes
Glitch/enhancement: Trailing and leading dots in author and title tag will automatically be removed for file/folder name.
Bugfix: Folder and tag customization was ignored for single part books.

Version 1.3

Additional conversion mode:
Split book into tracks of roughly equal length, ignoring chapters.
Automatic online update feature.
Minor fixes/enhancements.
Hide changelog

All features

Free and Open Source software.
Converts Audible proprietary .aax files to plain .mp3 or .m4a/.m4b.
Also offers basic support for older .aa files.
Windows application, with all the classic features of the Windows eco-system.
Requires activated Audible Manager/App or personal activation code.
Processing Modes:
One output file per input file.
Multiple output files per input file, divided by chapter.
Multiple output files per input file, divided by chapter and further split into shorter tracks of roughly equal length.
Multiple output files per input file, split into shorter tracks of roughly equal length, ignoring chapters.
Creates additional playlist if more than one output file is created per book.
Handles books with multiple parts.
Manages and preserves all meta-tag information.
Supports named chapters, for .aax files downloaded with the Audible App.
Allows customization of output naming: files, folders and tags.
Delegates all audio processing to powerful FFmpeg, including DRM handling.
High performance: Utilizes all available processor cores to run conversion work in parallel.
Optionally copies original .aax file to a new location after the conversion, with a customizable name.
Automatically launches default media player after conversion has completed.
Log facility, optional, to record program activity, activated with program argument.
Online update function: Will automatically scan the website for a new version, download and install it.
.Net Framework application, written in C# with Windows Forms, the Task Parallel Library and other goodies from language and framework.
Incorporating a number of snippets from the Open Source community.

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