AA to M4B Converter

Convert AA to M4B online quickly and easily. Just upload your file, convert it, and download the M4B in seconds.

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What is AA ?

The AA file extension is used by the Audible audio book service to store audio books in a digital format. Audible is part of the Amazon company. Various devices can play AA files, like the Apple iPod or Amazon Kindle. The format is, however, not supported by most digital audio players. A conversion to a more compatible audio format like MP3 is needed to, for example, listen to the audio book in Windows Media Player. The AA file format has, since its introduction, been improved, creating the AAX file extension.

AA files belong to the audio files category, however they differ from audio files like MP3 or WAV in some aspects. Next to the actual auditory data, AA files can also contain further information like chapter markers and bookmarks. AA files can be saved in three different formats, ranging from 8 kbit/s to 32 kbit/s. The audio quality is thus dependent on the bitrate, ranging from AM radio-like to MP3 quality. AA files can be DRM protected which makes it impossible to convert to a more widely used audio format.

Here's a small, but not exhaustive list of programs that can open AA documents:

  • Audible AudibleManager (Windows)
  • Apple iTunes (Windows & Mac)
  • Nero (Windows)
  • Audials Tunebite (Windows)
  • SoundTaxi Media Suite (Windows)
  • TuneCab (Windows)

AA format  ▶

What is M4B ?

M4B is the audiobook version of M4A: AAC audio in an MPEG-4 file with chapter marks and bookmarking, used by Apple Books and many audiobook apps.

M4B format  ▶

How to convert AA to M4B

  1. Upload your AA file
    Drag and drop your AA file, click 'Select Files' to upload from your device, or import directly from Dropbox, Google Drive, OneDrive, or paste a URL.
  2. Choose M4B as output format
    The converter is preset to M4B, but you can select any other output format before converting.
  3. Adjust settings (optional)
    If you like, tweak output options such as resolution, quality, or compression before converting.
  4. Convert the file
    Click the 'Convert' button. The conversion takes only a few seconds.
  5. Download your converted file
    Download the converted file to your device, or save it directly to Google Drive, Dropbox, or OneDrive.