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Bulk AIFF to M4A Converter Online — Free HD Quality

Drag and drop your multiple AIFF files into this free online AIFF to M4A converter (.aiff to .m4a), and click the Convert button to bulk convert them to M4A format in HD quality. Use the quality slider to fine-tune your M4A output, then download your converted files one by one or as a single ZIP — your original AIFF files are removed from our servers right after.

To:
85%

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PNG, JPG, WebP, GIF, HEIC, RAW, PSD, SVG and more

Max 100MB per file

AIFF vs M4A — File Format Comparison

Feature AIFF M4A
File Extension .aiff .m4a
MIME Type audio/aiff audio/mp4
Compression Type Lossless Lossy
Metadata Support Yes Yes

What Is AIFF Format?

Audio Interchange File Format — Apple's uncompressed audio standard functionally equivalent to WAV but preferred in professional Apple audio workflows and GarageBand projects.

  • Compression: Lossless
  • Tags & Metadata: Supported

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