AMR to M4R
Convert AMR files to M4R online for free. Fast, secure, and no installation required. Best AMR to M4R tool.
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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
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