M4R is a file format created for iPhone ringtone. iTunes has ability to create custom ringtones but users have to buy from iTunes store. Now there is a good software which can make M4R iphone ringtone format, Emicsoft iPhone Ringtone Maker for Mac software.
The best iPhone Ringtone Creator Mac can convert almost all the video and audio formats like MOV, AVI, MPEG, WMV, MP4, FLV, MKV, H.264/MPEG-4, DivX, XviD, RM, RMVB, MP3, WMA, AAC to iPhone ringtone M4R format. The built-in ringtone sync function lets users directly import converted ringtones to iPhone without itunes needed.
With the iphone ringtone converter software, setting the hide of a song as ringtone can be easily realized and adjust the clip by its pre-listening function. Delete or rename M4R files, and create unique ringtones now. Free download the powerful Emicsoft iPhone Ringtone Maker Mac.
Support iPhone/iPod touch Firmware 3.1.3.
Click to get Windows version: iPhone Ringtone Maker for Windows.
Make iPhone ringtones files from other formats with iPhone Ringtone Maker for Mac
Custom M4R files with Mac iPhone Ringtone Maker software
Processor: PowerPC® G4/G5 or Intel® processor
OS Supported: Mac OS X v10.4 - 10.5, Snow Leopad.
Hardware Requirements: 512MB RAM, Super VGA (800×600) resolution, 16-bit graphics card or higher.