How to Convert M4A to M4R on Mac
The audio file format used by Apple in their popular iTunes Music Store often appears on your system with the ".M4A" filename extension. M4A can produce better audio quality than MP3 using less physical space for the files.
The same is true for M4R which essentially is the same as an M4A file but with a different extension. The dedicated extension ensures that when an .m4r file is dragged to iTunes for example - the ringtone is automatically recognized and installed - ready to be synced with the iPhone (including iPhone 4S).
However, how to convert M4A to M4R on Mac and save those M4R files in your hard drive? M4A to M4R converter for Mac is your best choice to finish M4A to M4R conversion on Mac. Therefore, we will show you how to operate specifically.
How to convert M4A to M4R for Mac?

Step 1 Download M4A to M4R converter for Mac and launch it
Please first download M4A to M4R converter for Mac, install and launch it, you will get the interface like above. Link your iPhone to your Mac (this program supports many models such as iPhone 3G, iPhone 4G, iPhone 4S).
Free Download M4A to M4R converter for Mac
Step 2 Add files and edit them
You can choose the files which you want to convert M4A to iPhone ringtone on Mac (Snow Leopard, Lion included), and drag the M4A file to the software directly. You can also input M4A files in iTunes library from the left category.

This program has powerful editing functions, you can use a slide bar to trim a segment or type the time value directly.
Step 3 Preview and convert to M4R
Pre-listen
and make sure you are satisfied with all settings. Tick "transfer to iPhone" and click "start", you will convert M4A to M4R on Mac easily and efficiently.
