Bulk AIF to M4B Converter Online — Free HD Quality
Drag and drop your multiple AIF files into this 100% free online AIF to M4B converter (.aif to .m4b), and click the Convert button to bulk convert them to M4B format in HD quality. Use the quality slider to fine-tune your M4B output, then download your converted files one by one or as a single ZIP — no signup and no downloads needed, and your original AIF files are removed from our servers right after. Also see:How to turn AIFF into FLAC?.
Drop your AIF files here to convert to M4B, or click to browse
Converts .aif to M4B (.m4b) in HD quality — bulk, free, no signup
Choose FilesAIF vs M4B — File Format Comparison
See how AIF and M4B compare across file extension, MIME type, compression, and feature support. Related:Make AIF files into OPUS.
| Feature | AIF | M4B |
|---|---|---|
| File Extension | .aif | .m4b |
| MIME Type | audio/aiff | audio/mp4 |
| Compression Type | Lossless | Lossy |
| Metadata Support | Yes | Yes |
What Is AIF Format?
Audio Interchange File Format (short extension) — the .aif variant of AIFF used by older Apple software and some DAWs; functionally identical to .aiff with the same uncompressed PCM quality. See also:Convert multiple AIF to ALAC at once.
- Compression: Lossless
- Tags & Metadata: Supported
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.
- Compression: Lossy
- Tags & Metadata: Supported