How to Make a Song into a Ringtone
The process starts on your computer, where you will use iTunes to choose a 30-second portion of a song and export that song clip in a file format that your iPhone can recognize as a ringtone.
Sync the Ringtone to Your iPhone
Once you’ve created your new ringtone, then you need to sync it to your iPhone so you can begin using it. The sync process is pretty straightforward.
Set the Ringtone on Your iPhone
Now that you’ve created a ringtone and copied it to your iPhone, you can configure your phone to use it when a call comes in.
What You Need
The process is not as simple or straightforward as most iPhone tasks, since Apple doesn’t include any sort of built-in method for setting your existing songs as ringtones. You’ll need to use iTunes on your computer, and follow a few steps to convert your desired song to a special file format, then sync it with your iPhone. Once you learn how to do this, though, you can do it easily for multiple songs and set up custom ringtones for all your favorite contacts.