M4B to VOC converter
A free M4B to VOC converter for MPEG-4 Audiobook files. Browser-based pairs here usually run in this tab, with no file upload.
Drop your M4B files here
or browse your device · paste with Ctrl+V
Accepts .m4b files. You can queue several files; each is processed one after another on your own device.
Your files never leave this device — there is no upload and no server to delete them from.
- 01
Add your M4B files
Drop them onto the box above or click to browse. They are read straight from disk — nothing is sent anywhere.
- 02
Check the settings
VOC is already selected. Open the gear icon on any row if you want to change quality, dimensions or codec before converting.
- 03
Download your VOC
Press convert and wait for the row to finish. Convert several files and you can take them all as a single ZIP.
M4B
MPEG-4 AudiobookAn M4A that flags itself as an audiobook, so players remember your position and honour chapter markers. Audible titles land here once stripped of DRM.
- Developed by
- Apple
- Released
- 2003
- Extension
- .m4b
- MIME type
- audio/mp4
- Compression
- Lossy
VOC
Creative Voice FileThe Sound Blaster format from the DOS era. You will only meet it inside old game assets and demoscene archives.
- Developed by
- Creative Labs
- Released
- 1990
- Extension
- .voc
- MIME type
- audio/x-voc
- Compression
- Lossy or lossless
- M4B is already lossy, and while VOC can be saved either way, this conversion cannot restore discarded details. Saving it lossless here preserves what is already present instead of discarding more.
Questions about converting M4B to VOC
Is this M4B to VOC converter free?
Yes. Converting M4B to VOC here is free, with no account, no watermark and no daily quota. The work runs on your own device, so there is no server cost to pass on to you.
Is my M4B file uploaded anywhere?
For browser-based pairs, your file is read locally and converted by ffmpeg in this tab. No file payload is uploaded; you may still see analytics and engine downloads in network logs.
Is there a file-size limit for M4B to VOC?
There is no imposed upload cap when it runs in-browser, but each conversion still depends on your device and browser memory. Large videos are the first practical limit, then memory-heavy documents or images.
Does converting M4B to VOC lose quality?
It depends on your selected settings and codec path. Many engines can write either lossy or lossless output for VOC, so you can usually increase quality if this file is your final version.
Can I convert several M4B files to VOC at once?
Yes. Drop in several files and each gets its own row; they are processed one after another on your device. You can download them one by one or as one ZIP.
Does M4B to VOC work on a phone, Mac or Chromebook?
Most modern browsers on Windows, macOS, Linux, ChromeOS, Android and iOS work. Very large videos are often more reliable on desktop or a browser with more memory.
Why do some conversions take longer on first run?
The conversion engine has to download first. Small codec bundles are fast, while ffmpeg is commonly 12–30 MB; later conversions of similar type use the cached engine.
I converted a file and the output is blank or unusable. What should I check?
Start over with default settings, then change one option at a time (quality, bitrate, page size, or codec) to isolate what changed behavior. If it keeps failing, retry with a smaller file and confirm the source format matches the pair.
Convert other formats to VOC
41 formats can become VOC here.
Convert M4B to other formats
A M4B file can become any of these.
VOC to M4B
The reverse conversion
M4B to MP3
M4B to WAV
MP4 to VOC
Extract Audio from Video
Pull the soundtrack out of a video as an MP3.…
Compress Audio
Lower the bitrate of audio files to save space.…
Trim Audio
Cut a section out of an audio file.…
Normalise Audio
Even out loudness across files so nothing is jarring…