All about AAX Files

The AAX file type is primarily associated with Audible.

AAX	File extension: AAX
	File type:	audiobook

What is an AAX file?

AAX files mostly belong to Audible by Audible. An AAX file is a special kind of audiobook developed and used by Audible audiobook purchase and playback platform. AAX expands on the AA format by including support for extra content. Unlike AA files, which only contain audio, AAX files can also store images, links, videos, timelines and other information. This AAX capability allows Audible to provide a richer audiobook listening experience to its users. AAX also includes a built-in digital rights management system. DRM protects AAX files from unauthorized playback by requiring users to provide an Audible username and password. Without the proprietary DRM encryption, AAX files are simply MPEG-4 Audio Book (M4B) files. They contain audio data encoded in variable quality AAC format. The format supports bitrates from 32 to 128 kbit/s and sample rates from 22.050 to 44.10 kHz. After compression, AAX files use roughly 28.8 megabytes of storage per hour of audio.

How to open an AAX file

You need a suitable software like Audible to open an AAX file. Without proper software you will receive a Windows message "How do you want to open this file?" or "Windows cannot open this file" or a similar Mac/iPhone/Android alert. If you cannot open your AAX file correctly, try to right-click or long-press the file. Then click "Open with" and choose an application. You can also display a AAX file directly in the browser:. Just drag the file onto this browser window and drop it.

Online AAX Text Viewer

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Programs that open and convert AAX files:

Audible by Audible
See the previous paragraphs to learn more about the main application. AAX files are often referred to as Audible audios because this type of file is primarily created or used by this software.
iTunes (audiobook) by Apple
iTunes is a media player and library. It can also function as an internet radio broadcaster and mobile device media manager. iTunes is available for Windows and MacOS. It supports a wide range of formats, including AAX, AAC and MP3. This file format is classified as Audio. Related links: Wikipedia iTunes entry

AAX file format details:

Every file has a defined file format, i.e. how the data is arranged in the file. The first characters in a file identify the file format, for example, HTML files start with the bytes <html>. If the file extension or signature does not match the file format, errors will occur when opening or editing the file. So you need a detailed analysis of a file to find out the format and the associated program. Below you will find our evaluation of the AAX files:

The AAX file type predominantly uses a uniform format. The two most common formats are as follows:

97% of all AAX files are Audible Enhanced Audio files, which are based on the MP4 file format. MP4 is a multimedia container format used to store video and audio and allows streaming over the Internet. These files contain neither text nor words, but only data. AAX files are between 59 MB and 690 MB in size. The file type is relatively new. Several words can almost always be found in the files, e.g. $ftypaax, \tkhd, lmvhd, aax M4B mp42isom, moov and trak. Files like these are about stereo, teil, power, book, howto, mono, your, gesprochenvon, diekomplette, potterundder, rufus and make.
3% of all AAX files have the same signature @UTF. These are binary files, so they do not contain words or text. The files are often between 1 KB and 4 MB in size. The following keywords are characteristic: (c)CRI, <NULL>, @UTF, data and lpflg.

Just click the "Choose your .aax file to analyze" button on this page to find out what your AAX file is.

Technical Data for AAX File Extension

File classification:

Audio

Related files:

aaxc, axx, aa, avd, mp4, aap, aaf, xd, dab

Related links:

Audible supported platforms

Mime type:

application/octet-stream, audio/vnd.audible.aax

an aax audiobook is a special file format by Audible and should only be edited and saved with the appropriate software.

How to solve problems with AAX files

Associate the AAX file extension with the correct application.
Update your software that should actually open audiobooks. Because only the current version supports the latest AAX file format. Search, therefore, e.g. on the Audible manufacturer website after an available Audible update.
To make sure that your AAX file is not corrupted or virus-infected, get the file again and scan it with Google's virustotal.com.
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