I'd like to convert an AAX audio file (audio book downloaded from Audible) to MP3 so I can listen to it on an older portable device, which does not support this format, nor use of apps such as the Audible App. I found online converters limited to 200 MB (whereas my file is a bit larger than that), and offline (desktop-installable) ones that I'd rather not install or that are not free.

Two such installable converters are:

Any recommendations how I get this done on Windows, using free software (with or without a GUI) or free online services?

  • 1
    Well, we do not support howtos here – but as it looks like you'd also be satisfied with a recommendation for good software: could you please specify what OS must be supported, and what your price limit would be if it comes to paid solutions? Also, must it offer a GUI, or would command-line solutions be acceptable as well?
    – Izzy
    Commented Nov 20, 2020 at 16:03
  • Thanks! I actually thought this site is more suitable than SuperUser since no software is known/proposed for this problem (from the linked meta: "A question asking how to accomplish a task with some specific software, as opposed to looking for some software to accomplish that task, would be off-topic. Such questions would typically be on-topic for Super User for end-user software"). In any even, I've edited the question to reflect the missing info. Thanks again!
    – z8080
    Commented Nov 22, 2020 at 11:11
  • 1
    Well… With the question rather asking for "how I get this done on Windows", it might indeed fit better on SuperUser. Here the focus is rather "what software meets the requirements". That apart, first piece coming to mind is FFmpeg, which handles quite a lot of formats (and runs on many platforms).
    – Izzy
    Commented Nov 22, 2020 at 15:47


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