AU is an audio file format similar to MP3 and WMA although it is relatively rare to public. It is playable on some certain players but not compatible with our common mobile devices and portable players. If you just want to play music, songs or other audio files in AU file format, you will need to resort to a practical AU audio converter and convert the files to MP3 or other common audio formats. Here we convert AU to MP3. Previously, we showed you how to convert MP3 to OGG, etc.

Part 1: How to Convert AU to MP3 with Leawo Video Converter

To convert an audio format like AU to an audio format like MP3, we need an audio extractor or an audio converter to do the magic. Here I recommend Leawo Video Converter, a professional video converter as its name shows. Not only a video converter, Leawo Video Converter is also an audio converter or audio extractor. On one hand, Leawo Video Converter is able to convert video from one format to another format including MP4, AVI, MOV, MKV, MTS, FLV, etc., and at the same time the program is able to convert various audio files like MP3, AAC, FLAC, AC3, etc. On the other hand, this professional program allows users to extract audio track from video files. The input and output video and audio formats supported by Leawo Video Converter include Common Video (MP4, H.265 MP4, MKV, H.265 MKV, MOV, etc.), Common Audio (AAC, AC3, WAV, MP3, WMA, FLAC, etc.), HD Video (HD MP4, HD AVI, HD TS, HD VOB, etc.), and 4K Video (4K MP4 and 4K MKV). This professional converter is able to convert video and audio files with 100% quality reserved and in 6X faster speed.

As is mentioned before, Leawo Video Converter can be regarded as an audio extractor for you to extract only audio track from source video files. Therefore, it can play the role of AU to MP3 converter to convert AU to MP3. If you are using Mac computer, you can make use of the Mac version of Leawo Video Converter. Download and install the right version of Leawo Video Converter based on your computer system, and then follow the guide below to convert AU to MP3.

Step 1. Import Source AU Audio Files

Launch Leawo Video Converter, go to the “Convert” tab, and click “Add Video” button on the sub-menu to load your source AU audio file. Alternatively, you can directly drag and drop AU audio file into the program interface. After AU audio file is imported, you could play back AU audio file, edit loaded AU audio file, etc.

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Step 2. Set MP3 as Output Format

Click the drop-down box named “MP4 Video” by default next to the “Add Photo” button. On the drop-down list, select “Change” option. Then on the popup Profile window, select “MP3” from “Format” column as output format. Please note that once you change the output format, the name of the drop-down box will change as well.

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Note: If you need, you could click the “Edit” button on the drop-down profile setting box to adjust audio parameters like audio codec, bit rate, channel, sample rate, etc.

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Step 3. Convert AU to MP3

Click the big green “Convert” button on the sub-menu bar next to the format setting drop-down box. Then, on the popup sidebar, set output directory. After setting output directory, click the “Convert” button right below. Leawo Video Converter would start to convert AU to MP3 immediately.

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Note: Leawo Video Converter is equipped with an internal video editor, which means you can edit video after you import source video files. There are many ways allowable for you to edit loaded video files: video trimming, cropping, watermarking, adjusting video effect and removing noise. At the same time, Leawo Video Converter has an internal video player that allows you to play video files after video importing.

Part 2: How to Convert AU to MP3 with MediaHuman Audio Converter

MediaHuman Audio Converter is a freeware application for Mac OS X and Windows. It can help you to convert your music absolutely free to WMA, MP3, AAC, AMR, WAV, FLAC, OGG, AIFF, Apple Lossless format and bunch of others. With a simple and intuitive interface, it can convert between all key audio formats. It supports batch conversion. With it, you can directly convert one lossless format to another, without intermediate conversion. For example, you can turn AU to MP3.

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Step 1. Add AU File
Run MediaHuman Audio Converter and press highlighted plus button to add AU audio files you want to convert to MP3 format. Other way to do it is to drag and drop files or folders on the application's window.

Step 2. Select MP3 as Output Format
Press highlighted Format button and select MP3 as an output format. You can select among of predefined settings or set up your own by choosing Custom.

Step 3. Start to Convert AU to MP3
Now we are ready to start the conversion. Press the Convert button on the toolbar and wait until the conversion process finishes. Press it again if you want to stop the conversion.

Part 3: How to Convert AU to MP3 with Hamster Free Audio Converter

Hamster Free Audio Converter is a new brilliant audio converter that turns audio conversions into fun. It supports AIFF, OGG, WMA, MP3, MP2, AC3, AMR, WAV, ACC. You can convert audio for any DVD player, iPod, iPhone, iPad, Archos, Zune, iRiver, Sony, or Explay in 3 clicks. You'll like the customizable interface - tune it to your own taste. Hamster Free Audio Converter is absolutely free. There are literally dozens of different audio formats out there. In addition to the popular MP3 format, there are many other compressed formats, lossless formats, formats optimized for mobile phones and other devices and a great deal more besides. If you want to make your audio collection more compatible, Hamster Free Audio Converter is the solution you need. Here let’s convert AU to MP3 with Hamster Free Audio Converter.

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Step 1. Add Source AU Audio File
On the main interface, click “Add more” to add source AU audio file. Once the audio files are added, click “Next” to continue.

Step 2. Choose MP3 as Output Format
Now, select MP3 as the output audio format to perform the conversion process.

Step 3. Start to Convert AU to MP3
Click “Convert” button to select the destination folder, after which the conversion will begin.

Part 4: How to Convert AU to MP3 with iTunes

iTunes itself has the ability to convert unfriendly audio files into iTunes compatible format MP3. What you need to do is to click a few buttons. iTunes would finish the converting and loading itself. To convert AU to MP3 via iTunes, follow the guide below: 

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Step 1. Add Source AU File
Open your iTunes and then click the drop-down menu on the upper-left corner to select “Add File to Library” to browse and choose AU audio files or directly drag and drop source AU file into iTunes.

Step 2. Convert AU to MP3
After AU is imported, iTunes would pop up a window to show you that the loaded AU audio files could be converted to MP3 format for adding to iTunes music library. Click “Convert” button. Then iTunes would carry out the AU to MP3 conversion and automatically add the source AU audio files in MP3 format.

When the converting process finishes, you can find the source audio (now in MP3 audio format) in music playlist.

Part 5: How to Convert AU to MP3 with CoolUtils

CoolUtils can achieve conversion from HTML to PDF, Word to TIFF, AC3 to MP3, AMR to MP3, or any other conversion types. This online file converter supports over 1400 formats. It is able to convert extra-large and complicated files, and batch conversion and processing is also feasible. AU to MP3 conversion can be easily achieved with the help of CoolUtils. It requires no tech knowledge. Intuitive interface makes it easy for everybody to be the master of audio conversions. If you do not know what bit rate or frequency to choose, the wizard of the program will automatically set the most appropriate.

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Step 1. Add Source AU Files
On the main interface, click “File” button on the top left to browse and choose source AU files. You can add multiple files at a single time.

Step 2. Choose MP3 as Output Format
Check the AU files you want to convert, and then choose “MP3” from the top to set output format. Before you start conversion process, you need to specify a folder to contain the converted results.

Step 3. Start Conversion from AU to MP3
Click “Start” to begin the conversion from AU to MP3.