Convert M4A to M4B

Convert M4A files to M4B format online for free. No upload required, 100% private.

Upload File

Drag and drop audio files here, or click to select

🔒 Your files are processed locally in your browser. Nothing is uploaded to our servers.

M4AM4BRe-encoding

Converting between two lossy formats (M4A → M4B) involves re-encoding, which may cause additional quality loss. For best results, convert from the original source file when possible.

About M4A

M4A

MPEG-4 Part 14 Audio

M4A is an audio-only MPEG-4 container format, commonly used by Apple devices and iTunes. It typically contains AAC or ALAC encoded audio.

Extension
.m4a
Developed By
Apple Inc.
Released
2001
Compression
Lossy

Typical Use Cases

iTunes musicApple devicesAudiobooksPodcasts

Pros

  • • Better quality than MP3 at same bitrate
  • • Good Apple ecosystem support
  • • Supports chapters

Cons

  • • Less universal than MP3
  • • Some older devices incompatible
  • • Requires specific codecs

About M4B

M4B

MPEG-4 Audiobook

M4B is an audiobook format based on MPEG-4. It supports chapters, bookmarks, and is the standard format for iTunes and Audible audiobooks.

Extension
.m4b
Developed By
Apple Inc.
Released
2001
Compression
Lossy

Typical Use Cases

AudiobooksPodcasts with chaptersLong-form audio content

Pros

  • • Chapter support
  • • Bookmark support
  • • Good compression

Cons

  • • Limited to Apple ecosystem
  • • Not universal
  • • Requires specific players