How to Make Ringtones Using iTunes
Ringtones are audio files used by mobile phones to notify users of incoming calls, text messages and more. Most new smartphones allow users to assign any M4R or MP3 format file as their ringtone. Although many companies sell ringtones, it is also possible to create your own for free using iTunes directly off your Macintosh or Windows-based computer.
Launch iTunes. Browse your music library and select the song you'd like to convert into a ringtone.
Listen to the song and make note of the exact starting point and ending point you'd like your ringtone to be. This can be any part of the song.
Right-click on the selected track and click "Get Info" and then click "Options." Check on the box next "Start Time:" and enter the exact time you'd like your ringtone to start in minute:seconds format. Check the box next to "End Time:" and enter the exact time you'd like your ringtone to stop. Click "OK."
Right-click the track again and click "Create AAC Version." ITunes will then convert your file into a new file using the start and end times you specified in Step 3.
Right-click on the newly created file in iTunes and select "Show in Explorer." Your file should be in M4A format. Double click the file and change it to M4R. The file will now be automatically added as ringtone in your iTunes library.