M4B Converter
MPEG-4 audiobook format with chapter markers.
🔒 Files are processed on your device. Nothing is uploaded.
Convert M4B to…
- M4B to MP3
- M4B to WAV
- M4B to OGG
- M4B to OPUS
- M4B to FLAC
- M4B to AAC
- M4B to M4A
- M4B to M4R
- M4B to WMA
- M4B to AC3
- M4B to AIFF
FAQ
Is converting M4B to other formats free?
Yes. Unlimited conversions, no sign-up, no watermark.
Are my files uploaded to a server?
No. FieldConvert processes files inside your browser, so your M4B files never leave your device. That makes it private and fast, because there is no upload or download wait.
Is there a file size limit?
Only your device's memory. Files up to about 2 GB work in most desktop browsers.