Bulk M4B to M4A Converter Online — Free HD Quality
Drag and drop your multiple M4B files into this 100% free online M4B to M4A converter (.m4b to .m4a), and click the Convert button to bulk convert them to M4A format in HD quality. Use the quality slider to fine-tune your M4A output, then download your converted files one by one or as a single ZIP — no signup and no downloads needed, and your original M4B files are removed from our servers right after. Also see:Transform FLAC to WAV.
Drop your M4B files here to convert to M4A, or click to browse
Converts .m4b to M4A (.m4a) in HD quality — bulk, free, no signup
Choose FilesM4B vs M4A — File Format Comparison
See how M4B and M4A compare across file extension, MIME type, compression, and feature support. Related:WAV to WMA conversion tool online.
| Feature | M4B | M4A |
|---|---|---|
| File Extension | .m4b | .m4a |
| MIME Type | audio/mp4 | audio/mp4 |
| Compression Type | Lossy | Lossy |
| Metadata Support | Yes | Yes |
What Is M4B Format?
MPEG-4 Audiobook — AAC audio in an MP4 container with bookmarking support, the standard format for audiobooks on Apple Books, Audible exports, and iPhone podcasts. See also:Batch MIDI to iPad Audio converter.
- Compression: Lossy
- Tags & Metadata: Supported
What Is M4A Format?
MPEG-4 Audio — AAC audio in an MP4 container, the standard format for Apple Music, iTunes purchases, and iPhone voice memos, offering better quality than MP3 at equivalent bitrates. You might also need:Mass MP1 to FLAC conversion.
- Compression: Lossy
- Tags & Metadata: Supported