Online M4B Converter

Convert your M4B files online – Easy, fast and secure.

Step 1 - Select a file(s) to convert
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Step 2 - Convert your files to
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Step 3 - Start converting
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Your file will be uploaded to DigitalOfficePro storage. By using this service, you agree to the DigitalOfficePro Terms of Use.

Converting audio files is now easy and fast! DigitalOfficePro web-based application helps you to convert audio files in seconds. You don't need to download or install any app / extension on your device because our audio converter works completely online. Convert more than 100+ audio formats into popular formats like JPG, PNG, WebP, and many more. With the DigitalOfficePro online audio converter, you get a free and secure tool to switch between the most popular audio formats in the simplest way possible.

M4B, The file with .m4b extension is an audiobook generally used by Apple books and iTunes. The Audio used in this format is stored in MPEG-4 and compressed by using AAC encoding. An M4B file is very similar to M4A but having support the audiobook related features, such as bookmarking and chapter breaks. The M4B files are available in both DRM enabled and DRM free versions. DRM encryted audiobooks are usually paid audiobooks from iTunes Store. Whereas, DRM free can be found easily over the internet.

Free to Everyone

Absolutely FREE online service. There is no extra cost to use it. You can convert as many files as you like. No need to downloading and installing additional apps/extension on your computer.

100% Secure

We are not storing your content on our servers. Your files are automatically deleted from our servers instantly after the conversion process. We guarantee file security and privacy.

High Speed Conversion

Your files are converted using our powerful conversion servers. In most of the cases, the conversion process takes less time than it would take if you used your computer.

No Limitations

Unlike other services, our online service has no limit on the number of files you can convert. Convert as many as you want. You don’t even need to register or login to our website.

Quality Output

We are using high quality conversion algorithms, so you won't lose quality during the file conversion. Your converted output file retains same quality and effects of original file.

Support 100+ Formats

We supports more than 200 file formats, more than any other online converter and the number keeps growing. Support nearly all document, image, video, audio and ebook formats.

Free M4B File Conversion Tools