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Bulk M4R to AMR Converter Online — Free HD Quality

Drag and drop your multiple M4R files into this free online M4R to AMR converter (.m4r to .amr), and click the Convert button to bulk convert them to AMR format in HD quality. Use the quality slider to fine-tune your AMR output, then download your converted files one by one or as a single ZIP — your original M4R files are removed from our servers right after.

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

Max 100MB per file

M4R vs AMR — File Format Comparison

Feature M4R AMR
File Extension .m4r .amr
MIME Type audio/mp4 audio/amr
Compression Type Lossy Lossy
Metadata Support Yes No

What Is M4R Format?

iPhone Ringtone — AAC audio in an MP4 container under 40 seconds, the format iTunes and iPhone use for custom ringtones; identical to M4A in encoding but recognised by iOS as a ringtone file.

  • Compression: Lossy
  • Tags & Metadata: Supported

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

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