Convert MPEG-4 Audiobook (.m4b) to Ogg Vorbis (.ogg) online for free. Fast, secure audio conversion with no watermarks or registration.
Upload your .m4b file by dragging it into the upload area or clicking to browse.
Choose your output settings. The default settings work great for most files.
Click Convert and download your .ogg file when it's ready.
Converting M4B audiobooks to OGG Vorbis moves content from Apple's proprietary audiobook format to the fully open-source OGG ecosystem. Vorbis at low bitrates (32-64 kbps) handles spoken word efficiently, making it a reasonable target for audiobooks. Chapter markers from M4B are lost, but OGG's Vorbis comment metadata stores title, narrator, and other book information. This conversion is relevant for Linux users, open-source advocates, and platforms that prefer patent-free formats.
Linux audiobook players (Cozy, GNOME Podcasts) handle OGG natively. Open-source audio platforms prefer patent-free formats. Audiobook distribution through open-access libraries or educational platforms may prefer or mandate OGG. The conversion also produces smaller files at equivalent quality compared to MP3, which is the typical alternative for non-Apple audiobook distribution.
FFmpeg decodes the M4B's AAC to PCM and encodes using libvorbis inside an OGG container. For spoken word, Vorbis quality 2-3 (≈64-80 kbps) provides good clarity at small file sizes. Vorbis comments store metadata (title as ALBUM, narrator as ARTIST, chapter as TITLE). OGG does not natively support audiobook-style chapters, though some players parse chained OGG streams as pseudo-chapters.
Vorbis at 64 kbps provides equivalent or better quality than the original M4B's AAC at the same bitrate for spoken word. At quality 3 (≈80 kbps), narration sounds excellent. Since M4B audiobooks are already low-bitrate, the lossy-to-lossy conversion introduces minimal additional degradation at matching bitrates.
| Device | M4B | OGG |
|---|---|---|
| Windows PC | Partial | Partial |
| macOS | Partial | Partial |
| iPhone/iPad | Partial | Partial |
| Android | Partial | Native |
| Linux | Partial | Native |
| Web Browser | No |
Resolution: N/A
Bitrate: 320 kbps
OGG Vorbis preferred
Resolution: N/A
Bitrate: 256 kbps
AAC format required
Resolution: N/A
Bitrate: 128 kbps
Lossless FLAC/WAV for best quality
Resolution: N/A
Bitrate: 128 kbps
MP3 mono for spoken word
M4B to OGG Vorbis is ideal for open-source environments and patent-conscious distribution. Quality is excellent for spoken word at compact file sizes.
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| Native |
| ฟีเจอร์ | M4B | OGG |
|---|---|---|
| ชื่อเต็ม | MPEG-4 Audiobook | Ogg Vorbis |
| นามสกุล | .m4b | .ogg |
| เหมาะที่สุดสำหรับ | Chapter support | Open source |