Bulk M4B to AAC Converter Online — Free HD Quality
Drag and drop your multiple M4B files into this 100% free online M4B to AAC converter (.m4b to .aac), and click the Convert button to bulk convert them to AAC format in HD quality. Use the quality slider to fine-tune your AAC 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:How to batch convert AIF to WAV?.
Drop your M4B files here to convert to AAC, or click to browse
Converts .m4b to AAC (.aac) in HD quality — bulk, free, no signup
Choose FilesM4B vs AAC — File Format Comparison
See how M4B and AAC compare across file extension, MIME type, compression, and feature support. Related:Quick M4B to IPOD online converter.
| Feature | M4B | AAC |
|---|---|---|
| File Extension | .m4b | .aac |
| MIME Type | audio/mp4 | audio/aac |
| 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:MP2 to AAC converter - no registration.
- Compression: Lossy
- Tags & Metadata: Supported
What Is AAC Format?
Advanced Audio Coding — the successor to MP3 adopted by Apple, YouTube, and mobile platforms; delivers better quality than MP3 at the same bitrate, especially below 128 kbps.
- Compression: Lossy
- Tags & Metadata: Supported