What is Audible Enhanced Format: Audible AAX

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In the upcoming weeks, we will be moving all downloads to an enhanced, high-quality audio format and will no longer support format 4 downloading.

It’s been a while since Audible announced that it will phase out format 4 and move to Audible enhanced format only. So I login into my Audible library to check whether they make the further action or just saying. It is obvious that Audible did what is promised that there is no Audio quality options anymore. From now on, all your downloaded audible books will be in Audible enhanced format--.aax format.

convert audible to mp3

What is Audible Enhanced Format: Audible AAX?

But what is Audible enhanced format? Audible enhanced format is an exclusive Audible audiobook format that are minimally compressed so the audio quality is better than any other Audible previously supported format—format 4, format 3, and format 2. Since Audible enhanced format is ended with .aax extension so it is also called AAX format.

Audible Enhanced Format (AAX) vs Audible Format 4 (AA): Understanding the Difference

Audio Quality:

The format 4 is with 32 bits whereas Audible enhanced format is with 64 bits.


AA files tend to have smaller sizes compared to AAX due to lower audio quality and fewer features. While AAX has larger file sizes due to higher audio quality. If you don’t have much internal storage on your players, format 4 can save your life.

Advanced features:

AAX allows for additional features such as chapter markers, images, and even multimedia elements, enhancing the overall audiobook experience.

AA supports standard audiobook features without the advanced capabilities found in AAX. It serves as a straightforward format for users who prioritize simplicity.


If you choose format 4 that means you will sacrifice the audio quality because audible enhanced format is noticeably better than format 4.

But this is no longer the case, from now on you have not any other option but audible enhanced format. To be honest, the quality of the audio downloaded as audible enhanced format is really high which is deemed as having CD-quality sound. If you have never downloaded audible enhanced before, just go to your audible library and just download one audio, and you’ll love it.

After knowing what audible enhanced format is, you must be curious that is there any way to convert audible enhanced format to mp3 or m4b, the most widely used format. Don’t worry. I am going to share you the easiest way to convert Audible enhanced format to mp3 or m4b in the following part.

Pro tip: How to Convert Audible Enhanced Format AAX to MP3 or M4B

Step 1: Download & install Epubor Audible Converter.

The Tool You'll Need Epubor Audible Converter


Key features of Epubor Audible Converter:

1 Download and Convert Audible AA/AAX(audible enhanced format) to MP3/M4B

2 Split Audible into chapters with original quality preserved

3 Enable you to edit the metadata of Audible books

4 Super-fast conversion speed

Step 2: Sign in to Audible within Epubor Audible Converter.

Just click "Log in" at the top right corner, and select your Audible region, and then sign in with your Audible account.

epubor audible converter

Step 3: Download and convert Audible to mp3/m4b/mp4

After signing in to Audible within Epubor Audible Converter, click "Refresh" to load your Audible library in the left column. Then, select the Audible books; you can choose one or more audiobooks at a time and drag them to the right side. Now, choose your output format and click the convert button to download and convert your Audible enhanced format to MP3, M4B, or MP4.

edit audible metadata

To find the converter Audible books, just click the "Open" button at the top menu bar.

pop-up folder

Now you can follow my steps to convert audible enhanced format AAX to MP3 or M4B.

More tips on Audible AAX Format

1From now on, the audible books downloaded to your computer, no matter via Audible app for Windows, audiblesync, and from Audible.com directly, will be in audible enhanced format (.aax) format.

2For the audible books downloaded from Audible android devices, they are in .aaxc format. This format is not able to be decrypted with Epubor Audible converter directly or any other audible converter on the market. Hereby, please download the audible books to your computer and then convert with Epubor Audible Converter.

3. Compared to downloading Audible books and then dragging them to Audible converter software to convert, Epubor Audible Converter makes things much easier. You only need to sign in to Audible within the Epubor software; it will automatically detect your Audible library, helping you download and convert them with just one click. No need to go through additional steps for downloading Audible books.

4. In some Audible regions, even if you have purchased the Audible books, there may not be a "Download" button available for you to download your Audible books. Epubor Audible Converter is the lifesaver for this type of Audible books.

Now it's your turn to download the Epubor Audible Converter and convert your .aax (audible enhanced format) to mp3.

Download Epubor Audible Converter for free:



has been a passionate member of Epubor since 2017. Her mission is to enhance your ebook reading experience by sharing insightful tips and tricks. Join her on a journey towards reading excellence today!

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