WAV to M4B
Convert uncompressed WAV recordings into a chaptered M4B audiobook — right in your browser. Perfect for home narrators and self-published authors. 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
Title is required.
Author is required.
Verify metadata (optional)
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.
WAV to M4B — common questions
- Why are my WAV files so much larger than the output M4B?
- WAV stores uncompressed PCM audio, which is very large. The M4B output uses AAC at 64 kbps — the standard for spoken-word audiobooks — which is roughly 15–20× smaller with no audible difference for speech. A 1 GB WAV audiobook typically becomes a 60–80 MB M4B.
- I recorded my narration as WAV. Can I convert it directly to M4B?
- Yes — this is a common use case for self-published authors and home narrators. Drop your WAV chapter files, fill in the title and author fields, optionally add a cover image, and click Convert. The tool will encode each chapter to AAC and join them into a single chaptered M4B.
- Can I mix WAV with other formats like MP3?
- Yes. Every input file is re-encoded to AAC before being joined, so you can mix WAV, MP3, FLAC, and other supported formats in the same audiobook without any extra steps.
- Are my WAV files uploaded anywhere?
- No. Conversion runs entirely inside your browser using a WebAssembly build of FFmpeg. Your audio files never leave your device. Open your browser's Network tab while converting to verify there are no upload requests.