Bulk M4B to iPhone Audio Converter Online — Free HD Quality
Drag and drop your multiple M4B files into this free online M4B to iPhone Audio converter (.m4b to .iphone), and click the Convert button to bulk convert them to iPhone Audio format in HD quality. Use the quality slider to fine-tune your iPhone Audio output, then download your converted files one by one or as a single ZIP — your original M4B files are removed from our servers right after.
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PNG, JPG, WebP, GIF, HEIC, RAW, PSD, SVG and more
Max 100MB per file
M4B vs iPhone Audio — File Format Comparison
| Feature | M4B | iPhone Audio |
|---|---|---|
| File Extension | .m4b | .iphone |
| 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.
- Compression: Lossy
- Tags & Metadata: Supported
What Is iPhone Audio Format?
iPhone-optimised Audio — AAC/M4A audio encoded at 256 kbps, 44100 Hz stereo for maximum compatibility with iPhone, producing a .m4a file ready to sync via iTunes or AirDrop.
- Compression: Lossy
- Tags & Metadata: Supported
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