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Bulk M4A to M4B Converter Online — Free HD Quality

Drag and drop your multiple M4A files into this free online M4A to M4B converter (.m4a 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 — your original M4A files are removed from our servers right after.

To:
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Max 100MB per file

M4A vs M4B — File Format Comparison

Feature M4A M4B
File Extension .m4a .m4b
MIME Type audio/mp4 audio/mp4
Compression Type Lossy Lossy
Metadata Support Yes Yes

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.

  • Compression: Lossy
  • 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

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