Bulk AMR to M4R Converter Online — Free HD Quality
Drag and drop your multiple AMR files into this 100% free online AMR to M4R converter (.amr to .m4r), and click the Convert button to bulk convert them to M4R format in HD quality. Use the quality slider to fine-tune your M4R output, then download your converted files one by one or as a single ZIP — no signup and no downloads needed, and your original AMR files are removed from our servers right after. Also see:Convert MP3 to WMA free.
Drop your AMR files here to convert to M4R, or click to browse
Converts .amr to M4R (.m4r) in HD quality — bulk, free, no signup
Choose FilesAMR vs M4R — File Format Comparison
See how AMR and M4R compare across file extension, MIME type, compression, and feature support. Related:Convert multiple AMR to iPhone Audio at once.
| Feature | AMR | M4R |
|---|---|---|
| File Extension | .amr | .m4r |
| 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. See also:Convert AMR to WMA.
- Compression: Lossy
- Tags & Metadata: Not supported
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