M4R to AMR
Convert M4R files to AMR online for free. Fast, secure, and no installation required. Best M4R to AMR tool.
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Best in class algorithms for AMR conversion.
What is M4R?
iPhone Ringtone
M4R files are essentially renamed M4A (AAC) files used specifically as ringtones on the iPhone. They are limited to 40 seconds in length and use AAC encoding.
- iPhone ringtone
- AAC encoded
- 40s limit
What is AMR?
Adaptive Multi-Rate
AMR is an audio compression format optimized for speech coding. AMR is widely used in GSM and UMTS mobile telephony.
- Optimized for speech
- Very small size
- Mobile standard