Free online M4B to APE converter

Source format

M4B is an AAC-based audiobook container commonly used by Apple devices and audiobook apps. It is closely related to M4A, but it is typically used for long-form spoken audio and often supports chapter markers, bookmarks, and sometimes metadata such as cover art and track information. M4B files are popular for audiobooks, podcasts, and other speech-heavy content where playback position matters.

Target format

APE is the file extension for Monkey’s Audio, a lossless audio format. Its main advantage is that it preserves the original audio data without quality loss, which makes it useful for archiving and for users who want exact audio preservation. APE files are supported by fewer devices and players than more common formats such as MP3 or FLAC, but they can be a good choice when compression efficiency and bit-perfect retention are priorities.

How to perform the conversion

The most practical way to convert M4B to APE is with a desktop audio converter that supports both formats. One reliable option is FFmpeg, although it is important to understand that this conversion is usually not truly lossless if the source M4B is AAC-compressed. The audio can be re-encoded into APE, but the original AAC quality cannot be restored beyond what is already in the M4B file.

1. Install FFmpeg on your computer.
2. Open a terminal or command prompt in the folder containing the file.
3. Run a command such as ffmpeg -i input.m4b output.ape.
4. Check the resulting file in a player that supports Monkey’s Audio.

If you prefer a graphical program, use an audio converter such as Foobar2000 with the appropriate components or another desktop converter that can read M4B and export APE. In most programs, the workflow is similar: Open the M4B file, choose Convert or Export, select APE as the output format, then start the conversion.

You can also convert the file on 101convert.com for free, without installing any software.

Notes on quality and compatibility

The main limitation of this conversion is that M4B is usually compressed with AAC, while APE is lossless. That means converting from M4B to APE does not improve audio quality; it only stores the already-compressed audio in a different container/codec. The resulting APE file may also be larger than the original M4B.

Another important point is that chapter markers and audiobook-specific metadata may not transfer cleanly to APE, because APE is not commonly used for audiobook navigation. If preserving chapters is important, consider keeping the original M4B as well. Compatibility is also narrower for APE, so if your goal is broad playback support, a more widely supported format may be a better choice.