M4B is Apple's format for audiobooks: MPEG-4 audio, usually compressed with AAC, with chapters and bookmarks. MP3 is the widely supported format that plays on any phone, car player, and in the Music app. Some M4B files carry DRM protection, which cannot be converted because of App Store policies.
As MP3, an audiobook is ready for mobile and in-car listening. To MP3 Converter turns whole folders of M4B books into MP3 in one drag and drop, with the book's cover and tags kept. Its Automatic Volume Control is a perfect tool for enhancing the quality of audiobooks.
Convert M4B to MP3
Each M4B file becomes one MP3 file with the same name, so a book in chapter files stays in chapters.
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Open To MP3 Converter and select the Destination Folder.
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Drop M4B files or folders into the converter's window or icon.
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Click the top link in the Progress Window to open the new MP3 files in Finder.
To MP3 Converter converts several files simultaneously and fully utilizes all CPU cores. Encoding in separate processes makes it reliable and 'crash-free.'
Read More: How to convert to MP3 - Getting Started >>
Read More: Improving Drag & Drop Experience >>
Read More: Input Formats >>
Cover and tags
To MP3 Converter transfers the book's MP4 metadata and cover into ID3v2.4 and ID3v1 tags of MP3 files.
Read More: How to convert to MP3 without losing metadata >>
Clear voice
With Automatic Volume Control, quiet voices become hearable and distinctive. Turn it on with 'Adjust volume with' and 'Enable automatic volume control (Improve voice audio)' in Preferences / Effects.
Read More: Automatic Volume Control >>
Read More: Audio Effects and Volume Adjusting on macOS >>
MP3 settings
Automatic settings guarantee the best sound quality and save time and hard drive space.
To convert to a particular Bit Rate, set it up in Preferences / Format:
- Constant or Variable Bit Rate: 8 to 320 kbps.
- Sample Rate: 8 to 48 kHz.
- Channels: Mono, Stereo, Joint, or Dual.
Read More: Preferences / MP3 Format >>
To MP3 Converter is free to download. Upgrading to Premium unlocks Batch Processing, Metadata Downloader, and Audio Effects.
