Free online M4B to W64 converter
Convert M4B audiobook files to Wave64 W64 for large uncompressed audio workflows.
Convert M4B to W64 online - free
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How to convert m4b to w64 file
- Audio
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1mo
Source format
M4B is an AAC-based audiobook container commonly used by Apple devices and audiobook apps. It is very similar to .m4a, but it is typically associated with long-form spoken audio and often supports chapter markers, bookmarks, and metadata such as title, author, and cover art. People use M4B files for audiobooks, lectures, podcasts, and other narrated content where playback position and chapter navigation matter.
Target format
W64 is the Wave64 audio container format, developed by Sony as an extension of WAV for files larger than 4 GB. It is used mainly in professional audio production, archiving, and editing workflows where very large uncompressed or high-resolution audio files are needed. Compared with standard WAV, W64 supports much larger file sizes and is better suited to long recordings or multichannel audio.
How to perform the conversion
The most reliable way to convert M4B to W64 is with FFmpeg, because it can decode the audiobook audio and write Wave64 output directly. Since W64 is usually used for uncompressed audio, the conversion will typically produce a much larger file than the source.
- Install FFmpeg if it is not already available on your system.
- Open a terminal or command prompt.
- Run a command such as
ffmpeg -i input.m4b -c:a pcm_s24le output.w64. - If you want standard CD-quality PCM instead, use
ffmpeg -i input.m4b -c:a pcm_s16le output.w64. - Check the resulting file in an audio editor or player that supports Wave64.
If you prefer a graphical workflow, you can also use desktop audio tools that support FFmpeg import/export or Wave64 output, such as Audacity with the appropriate libraries installed. In many cases, the simplest option is to convert the file on 101convert.com for free, without installing any software.
Notes on quality and limitations
M4B is usually compressed AAC audio, so converting it to W64 does not restore lost quality; it only places the decoded audio into a larger, uncompressed container. The output quality depends on the chosen PCM codec, such as pcm_s16le or pcm_s24le. Also note that chapter markers, bookmarks, and some audiobook metadata are usually not preserved in a basic audio-only W64 conversion. Compatibility is another consideration: W64 is less widely supported than WAV, so make sure your target editor or playback software can open Wave64 files before converting.
Note: This m4b to w64 conversion record is incomplete, must be verified, and may contain inaccuracies. Please vote below whether you found this information helpful or not.
M4B vs W64: format comparison
How the M4B and W64 formats compare on the properties that matter most for this conversion.
| Property | .M4B MPEG-4 Audiobook File | .W64 Sony Wave64 |
|---|---|---|
| Compression | Lossy | Uncompressed |
| Audio quality | High | Lossless |
| Audio channels | Up to stereo | Multichannel |
| Metadata support | Extensive | Basic |
| Streaming | Partial | No |
| DRM protection | Optional | No DRM |
| Opens in a web browser | Partial | No |
| Typical file size | Small | Very large |
| Open standard | Yes | Partly open |
| Best used for | Music | Professional production |
| Introduced | 2001 | — |
| Developer | ISO/IEC | Sony |
| MIME type | audio/mp4 | audio/wave64 |
Frequently asked questions
Is the M4B to W64 converter free?
Yes, converting M4B to W64 on 101convert.com is completely free. No registration, email address or installation is required.
How large can my M4B file be?
You can upload M4B files up to 1000 MB and convert up to 100 files at once in a single batch.
What happens to my uploaded files?
Files are processed automatically and deleted from our servers within a few minutes after conversion. We never view or share your files.
Do I need to install any software to convert M4B to W64?
No. The M4B to W64 conversion runs entirely online in your browser and works on Windows, Mac, Linux, Android and iPhone.
Did the conversion fail?
In most cases, the cause is an incorrect file format. Please upload a valid M4B file for this M4B to W64 conversion. Occasionally, the issue may be on our side. We analyze recurring conversion failures and disable or fix the converter if we detect a defect.