Step-by-Step guide to create free iPhone ringtone for Mac
1. Download Aiseesoft iPhone Ringtone Maker for Mac Intel Version or Power PC Version, install and run the software. If you are a Windows user, please use Aiseesoft iPhone Ringtone Maker.
Click Browse… on the right side of "Input File" to import the file that you want to make ringtone from it.
2. Click 
to listen the music to find the segment that you want to use it as ringtone. Then drag and click the start & end slider to set your wanted segment, or type the start & end time in the corresponding text box directly to get the exact segment. Click 
to pre-listen the converted audio before generating M4R file.
3. Click Browse… on the right side of "Local Output Folder" to choose the output destination.
4. Check Export to iPhone option, the converted ringtone will be load to your iPhone directly
5. After all the settings are finished, click Generate to begin making your own iPhone M4R ringtone.
Several minutes later, the whole creating process can be finished. Then you can enjoy your own M4R ringtone on your iPhone. More information at: Create free iPhone ringtone.
