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Audio format

M4A converter

An .m4a file is an MPEG-4 container that holds only audio, most often AAC and occasionally Apple Lossless. Apple coined the .m4a extension so audio would not be confused with .mp4 video, and it remains the default for iTunes purchases, Apple Music downloads, and Voice Memos.

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Drop M4A files here

Batch files can each use a different output. Nothing uploads for local conversions.

Working inputs include camera RAW, browser-local audio/video, PDF, CBZ/CBR comics, office documents, ebooks, markup, 3D models, structured text, images, and archives.

Where M4A comes from

The extension entered wide use in 2003 when the iTunes Music Store launched selling 128 kbps AAC tracks. Apple moved the store to 256 kbps DRM-free 'iTunes Plus' encodes between 2007 and 2009, and the same wrapper later gained ALAC as a lossless payload option.

How M4A works

  • An ISO base media container restricted to audio tracks, structurally a sibling of MP4
  • The payload is usually AAC-LC, but ALAC inside the same extension is common in Apple ecosystems
  • The container tags the audio; the codec inside determines whether quality was sacrificed
  • The iTunSMPB atom records encoder delay and padding, enabling true gapless playback
  • The protected .m4p variant wrapped FairPlay DRM around early store purchases

When to use M4A

  • Managing music inside iTunes and Apple Music libraries
  • Sharing iPhone Voice Memos, which record to this format
  • Extracting audio from iPhone videos with a straight stream copy
  • Adding artwork and proper tags to AAC audio that a raw stream cannot hold

Strengths and limitations

Strengths

  • Real tagging and artwork support, unlike bare .aac streams
  • Gapless playback metadata for continuous albums
  • Plays across Apple, Android, Windows, and the web
  • One wrapper serves both lossy AAC and lossless ALAC

Limitations

  • The extension hides whether the contents are lossy or lossless, muddying quality expectations
  • Legacy .m4p relatives with FairPlay DRM cannot be converted
  • A few older non-Apple car units mishandle the container

Compatibility

Browsers, Windows, Android, and every Apple device play AAC-based .m4a files without extra software. The ALAC-filled variety is slightly narrower, since some inexpensive devices decode only the AAC form.

iTunes-style metadata atoms: title, album, artwork, composer, BPM, and the iTunSMPB gapless-playback data.

Convert M4A to another format

Convert other formats to M4A