Convert AA files online for free
The converter easily converts your AA file to various formats - free and online. No Media Player or extra software needed.
The converter also works in reverse, so you can convert other Audio formats to AA with high quality output.
The .aa extension primarily identifies the legacy Audible Audio format (Format 4), a proprietary audiobook container developed by Audible (an Amazon subsidiary). These files utilize low-bitrate compression (typically 32kbps MP3 or ACELP) and are wrapped in strict DRM (Digital Rights Management) to prevent unauthorized playback. While efficient for early 2000s devices, .aa files create significant friction today: they are incompatible with standard media players like VLC, cannot be dragged-and-dropped onto generic MP3 players, and require authorized software like iTunes or the Audible app to open. Users frequently need to convert these to M4B (to preserve chapters and metadata) or MP3 (for universal compatibility).
Crucial Note: A file ending in .aa may alternatively be a Split Archive Segment generated by the GNU split command or 7-Zip. In this context, file.aa is simply the first binary chunk of a larger file (followed by .ab, .ac, etc.) and is not an audio file at all. These cannot be "converted" individually; they must be joined back into the original file (e.g., ISO, TAR, MP4) before opening.
Use Convert.Guru to open and convert your AA file.
Users also converted AAX, AAC, MP3, TXT, AAXC, WEM, DNA, AAA and USB files.
The history of Convert.Guru began over 25 years ago in California with Tom Simondi’s file-format database. A former contributor to Space Shuttle development and a software pioneer of the 1980s, Simondi established a trusted resource for file type analysis that was even referenced by Microsoft Windows XP. Today, we use modern technology to process and convert thousands of file formats while continually improving our AA converter.