How to Download Audible Books to USB Flash Disk

By Elle Johnson

Updated on December 1, 2020

The size of an audiobook file relies on the length of it. The longer an audiobook is, the larger the file will be. According to the statistics, most audiobooks are about 10 hours, and audiobook files are 28 MB per hour on average. That is to say, a 10-hour audiobook file is File size is approximately 280 MB.

That is not a small file for many portable devices. When you are an audiobook lover, the internal storage is easily filled up with few audiobooks, whether on your phone or on other portable players.

Thankfully, we can resort to external storage like USB flash disks. In the following sections, you can get the easiest way to copy Audible books to USB flash disks to store more of your loved audiobooks. Or save Audible audiobooks to USB for backup.

copy audible books to usb

Part 1. Transfer Audible Books to USB: Tool You Need

Can you download Audible books to USB directly? The answer is no. Audible books are all restricted in the specially protected AA or AAX formats. In other words, these Audible files can’t be recognized by your USB drive when you copy and paste them to the USB disk.

The only solution is to use a third-party tool to lift this format restriction. Due to the complexity of the format conversion, it is suggested to pick out a powerful format converter. Here are some key features of the software that you should take into consideration.

1. Run at a super-fast conversion speed. Don’t forget audiobooks run for approximately 10 hours. If the conversion speed is 1X, it will take you dozens of hours to convert several Audible books.

2. Automatically identify and split audiobooks by chapters with 100% accuracy. It could a disaster if you need to manually split a 10-hour audio file chapter by chapter.

3. Keep lossless original sound quality and ID3 tags. That means your audiobook sounds 100% the same as the original.

AudKit Audible AAX Converter exactly meets all requirements above. Its conversion speed could up to 100X lightning faster. Users can customize the auto-split way, by chapters, by hours, or by segments. The output settings can be manually changed. To keep lossless output sound, you just need to set the bitrate to 128 kbps for books in Audible Enhanced Audio, 32 kbps for books in Format 4, 16 kbps for books in Format 3, and 8 kbps for books in Format 4.

In addition, this smart software supports multiple output formats, including MP3, AAC, M4A, M4B, FLAC, AC3, WMA, WAV, M4R, MKA, OGG, AIFF, and more.

audkit audible converter

Key Features of AudKit Audible Converter

  • Maintain 100% quality with all the original parameters
  • Convert Audible books at lightning speed of 100X faster
  • Download Audible files to multiple common audio formats
  • Reset ID3 tags for personal needs like editing the title, album, etc.

Part 2. Download Audible Books to USB: Steps to Follow

In this part, we will show you how to download Audible books to USB by using the AudKit Audible AAX Converter. Please make sure that you have download Audible books on the local computer in advance.

Step 1 Add Audible books to AudKit AAX Converter

load audible to audkit for usb

Download and launch the AudKit software from your desktop. Open the local folder that saves AA/AAX Audible files. There are 2 ways for you to import Audible items into AudKit. Select the Audible file in the folder then move it to AudKit’s interface. Or click the first ‘Add’ icon on AudKit’s interface. And locate the folder and choose the Audible files that you need.

Step 2 Reset Audible configuration for USB

reset audible format for usb

Hit the ‘lossless’ bar from the bottom place of AudKit’s main window. In the pop-out window, you can change the output format, sample rate, bit rate, codec, channel, and output address. If you don’t want to reset them, just keep the format in ‘Lossless’ and other parameters in ‘Auto’. The default settings will offer the best audio quality to you. Now, insert the USB flash disk into the computer. Reset the output address to the USB folder.

Step 3 Download and convert Audible books to USB

download audible books to usb

Hit the ‘Convert’ button from the right corner of the main page. The app now is activated and ready to convert all Audible AAX items depending on the customized settings. Once the conversion is accomplished, you can see a red tip hanging on the ‘folder’ icon. Open it to check the conversion list. You can further locate the ‘Converted’ folder on the local computer.

Tips: The free trial version of AudKit Audible Converter supports converting 1/3 content of each Audible audiobook. To finish converting the last 2/3 content, please purchase a license code and activate it in AudKit AAX Converter.


In this tutorial, we introduce the simplest way to copy Audible books to USB with the help of AudKit AAX Converter. The perfect conversion speed and considerate output features should give you the best experience of downloading Audible books to USB.

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