Bulk M4R to AMR Converter Online — Free HD Quality
Drag and drop your multiple M4R files into this 100% 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 — no signup and no downloads needed, and your original M4R files are removed from our servers right after. Also see:How to convert MP3 to CAF?.
Drop your M4R files here to convert to AMR, or click to browse
Converts .m4r to AMR (.amr) in HD quality — bulk, free, no signup
Choose FilesM4R vs AMR — File Format Comparison
See how M4R and AMR compare across file extension, MIME type, compression, and feature support. Related:Batch M4R to FLAC converter.
| 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. See also:Convert M4B files in bulk to iPad Audio.
- 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