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Bulk AMR to M4A Converter Online — Free HD Quality

Drag and drop your multiple AMR files into this free online AMR to M4A converter (.amr 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 AMR files are removed from our servers right after.

To:
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Max 100MB per file

AMR vs M4A — File Format Comparison

Feature AMR M4A
File Extension .amr .m4a
MIME Type audio/amr audio/mp4
Compression Type Lossy Lossy
Metadata Support No Yes

What Is AMR Format?

Adaptive Multi-Rate — the standard voice codec for GSM and UMTS mobile networks, used in phone call recordings and voice messages; delivers compact files optimised for speech at 8 kHz.

  • Compression: Lossy
  • Tags & Metadata: Not 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

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