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Wondershare UniConverter

All-in-One Video Converter

  • Convert MP3 format to M4B or other 1,000+ formats, including AAC, MKA, WMA, MP4, etc.
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  • 30X faster conversion speed than any conventional converters.
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Best 4 Ways to Convert MP3 to M4B

by Christine Smith • 2024-01-11 10:27:47 • Proven solutions

Audiobooks are becoming popular due to a variety of reasons. It comprises the entire text of a specific book. There was a time when MP3 files were in trend, but with the growing demand for audiobooks, M4B file extension is used widely nowadays. M4B file format is commonly for audiobooks used in iTunes. The file contains audio in MPEG-4 format and compressed in AAC encoding. These file types consume less storage space and offer audio in high quality. Any portable device can help you in playing audiobooks. If you want to convert MP3 to M4B file format, using an MP3 to M4B converter would be ideal. Other ways are there, but they may not work and may even ruin the audio quality.

Part 1. How to convert MP3 to M4B with the best M4B converter

It is becoming productive at what you do with your video and audio files with Wondershare UniConverter (originally Wondershare Video Converter Ultimate). Wondershare has always loved to roll out multimedia, utility, photos, and many other applications for individuals and businesspersons. It is specialized in creating those tools that enhance the efficiency of the users. One such handy tool and simple to use tool is Wondershare UniConverter. It does more than a video or audio converter can. The users can utilize it for converting MP3 to M4B files. It is featuring video compression, editing, converting, and plenty of other options.

video converter logo Wondershare UniConverter for Mac/Windows

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  • It will enable the compression of videos in a personalized manner
  • Can convert a media file into the desired format without any hassle
  • Edit videos, uniquely create them and add effect according to your choices
  • Share the edited videos to any social media handle
  • Compress more than one videos even of 8K quality in batches
  • Permit users to preview files
  • You can save videos from around 10,000 sites with a click
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How to use Wondershare UniConverter to convert in a batch on your Windows computer

Wondershare UniConverter is known as an effective and easy to use audio and video converter. It is perfect to work as MP3 to M4B converter free without causing a loss in the quality of a file. Follow the given instruction to learn how to convert MP3 to M4B file format.

Step 1 Import audio files.

Download and install the Wondershare UniConverter from the official link and launch the program on your PC. From the home interface and the left navigation menu, you have to select Converter and click on the +Add Files button for importing the MP3 file that you want to convert to M4B. There is also a drag and drop feature available with the program. Converting multiple files with Wondershare UniConverter is possible for batch processing.

add files

Step 2 Select the M4B format.

You have to choose the output format drop-down tab present at the bottom of the left navigation panel. When the pop-up window resembles, click on the Audio tab and choose the preferred audio output format. Here, you need to select M4B for converting MP3 to M4B.

choose the format

Step 3 Convert MP3 to M4B format

When you have selected the right option, click on the Start All button available at the right bottom corner. Within a short period, the imported MP3 files will be converted to the M4B file format. For converting files on your Windows PC, click on the Folder icon given at the File location tab present at the Window.

Part 2. How to convert MP3 to M4B on Mac with iTunes

For learning how to convert MP3 to M4B Mac with iTunes, you can follow the given method. This method is only for those who don’t have access to Windows PC. When you download an audiobook in MP3 format, then the iTunes application fails to identify it correctly. Therefore, an audiobook file might be in the music instead of where it must be. This is the reason why it is crucial to converting MP3 to M4B Mac by using iTunes. Given below is the stepwise process for converting MP3 to M4B Mac, which can be followed on Windows.

Step 1: Open iTunes

Launch the iTunes program on your Mac and select the MP3 file/files you want to convert by opening iTunes Library/Playlist/Songs/. After selecting the files, you need to right-click on any of them followed by choosing the Get Info option.

add files

Step 2: Alter “Options” Settings

Open the Options tab under the Get Info window. Now, you have to make an assortment of Audiobooks from the media kind drop-down menu. Change other settings according to your wish. This is all that you have to do and at last, click on OK to set everything. You can find the newly created file in the audiobooks section of iTunes.

choose the options

Part 3. How to convert MP3 to M4B online

You can convert MP3 to M4B online using a third-party site too, but it should be a reliable one. One such that we know is none other than Keepvid Online Converter. Any video or audio file can be converted with the help of this website.

Keepvid for MP3 to M4B converter online helps convert MP3 file formats to a plethora of other formats. You can visit the official link and see what it can do for you. The site interface is simple to understand and use. It will convert MP3 to M4B online and that too, without leading to quality loss.

Step 1: Open Chrome or Firefox on your PC, then copy and paste this link to the address bar and hit the Enter button.

Step 2: Wait for the page to open. Click on the +Choose File button for uploading an MP3 file to convert. Keepvid MP3 to M4B audiobook converter will be all set to convert the files once you select the output file type as Audio followed by output format as M4B.

choose the format

Step 3: Click on Convert Now for the conversion of all the uploaded MP3 files. To save, click on “Download” upon the completion of the process.

convert M4B to MP3

Part 4. How to convert MP3 to M4B free by changing the filename extension

Many are not aware that by changing the filename extension, you can convert MP3 to M4B. Though this method isn’t recommended, users can convert MP3 audiobooks to M4B format without any hassles. It is as simple as 1 – 2 – 3 things. You can convert video files and convert audio files just by changing the extension.

Before we move on to the step-by-step tutorial for this method, we would like to bring your attention to this method's drawbacks. Though this method is straightforward, it has its own flaws that are listed below:

● It is not the appropriate method to convert a file as the conversion never really happens. You change the file name extension so that a particular device can support it. But there is no guarantee the file will run properly on it.

● The converted file may get corrupted easily, as it is not the proper way of conversion.

● The final quality of the processed file will be hampered.

● Also, while some media devices or players may still support it, it may not be well supported by several other media devices.

● Let’s now explore the detailed guide on how you can convert MP3 to M4B free by changing the file extension.

Step 1: Navigate to the MP3 file that you wish to convert to M4B format. Once you have it handy, right-click over the file and opt for the Rename option from the pop-up menu.

choose the target file

Step 2: Next, you need to replace the “.MP3” extension in the file and save it with the “.M4B” extension. For instance, if your file name is “sample.MP3”, it should be “sample.M4B” after renaming.

change the file name

Step 3: Lastly, hit Enter on your keyboard and confirm your actions on the appearing pop-up window to save the new file name. You have successfully converted MP3 to M4B for free by changing the extension.

Part 5. What is the M4B format

M4B File Format refers to a MPEG-4 audiobook file, which supports iTunes. It is stored in the form of audiobooks. It is pretty similar to the M4A file but only made for audiobooks. Some media players use it for the storage of digital bookmarks. Because it is easier to pause, play, or resume anytime, that’s why people give preference to this file rather than MP3. Convert MP3 to M4B free and enjoy unlimited audiobooks.


We have talked about both MP3 to M4B converter windows and MP3 to M4B converter Mac. The software we have discussed and all other details are the results of hours of research. Give your valuable feedback, and if found helpful, please share it with others.

Christine Smith

Christine Smith

chief Editor

Resource > Audio Solutions > Best 4 Ways to Convert MP3 to M4B