OGG to M4B
Convert OGG Vorbis audio files into a chaptered M4B audiobook, right in your browser. Ideal for LibriVox downloads and open-source audiobook archives. Your files never leave your device.
Drop audio files + cover image, or click to browse
MP3 · M4A · WAV · FLAC · OGG · Opus · JPG · PNG
New here? M4B is the audiobook format Apple Books, Plex, and most modern players recognise: chapters, cover art, and resume position in one tagged file. Drop your audio in and you'll get back a single M4B with chapters at every file boundary.
- One chapter per file, titled from the filename
- Optional cover art, embedded at 1200×1200
- More detail on the FAQ page
Audiobook details
Verify metadata (optional)
Enter a title, author, or narrator first.
Cover image (optional)
Drop or click to add cover
JPG · PNG
Square images work best. Non-square covers are padded to 1200×1200 with a white background and embedded as JPEG.
Output bitrate
96 kbps, 128 kbps, 192 kbps, 256 kbpsTo enable: add at least one audio file, enter a title, enter an author.
How it works
- Step 1
Drop your files
Drag MP3, M4A, WAV, FLAC, OGG, or Opus files into the browser. They stay on your device.
- Step 2
Add metadata
Reorder chapters, set the title, author, narrator and cover. Embedded tags auto-fill what they can.
- Step 3
Download M4B
A single tagged, chaptered audiobook, ready for Apple Books, Plex, or any M4B-aware player.
OGG to M4B: common questions
- Where do OGG audiobooks typically come from?
- OGG Vorbis is commonly used by open-source audiobook projects, LibriVox archives, and some Linux-based media players. If you downloaded a free public-domain audiobook or ripped one using open-source tools, it may have come out as OGG. mp3tom4b converts those OGG files into the M4B format that Apple Books, Plex, and most modern players expect.
- Will I lose quality converting OGG to M4B?
- There is a small quality cost because OGG Vorbis is re-encoded to AAC, which means two lossy codecs in sequence. For spoken-word content the difference is imperceptible at 64 kbps. If your OGG files were encoded at a high bitrate for music, choose 128 kbps in the bitrate selector to minimise the loss.
- Can I mix OGG and MP3 files together?
- Yes. Every input file, regardless of format, is re-encoded to AAC before being joined, so mixed formats work fine in a single audiobook job.
- Are my OGG files uploaded for conversion?
- No. Conversion runs entirely in your browser via a WebAssembly build of FFmpeg. Nothing is sent to any server. You can verify this in your browser's Network tab while converting.