There are two different ways to convert music to ringtone.

Tools needed: iTunes and surely a music file!

OS: Mac OSX, XP and Vista.

1. Music that contains DRM and is bought through iTunes:

-Right click on the music in iTunes and select “Convert to Ringtone”.

2. Music not bought through iTunes:

Note: XP and Vista users click on “Properties” instead of “Get info”

-Right click on the music in iTunes and select “Get info”

-Go to “Options” tab

-Select “start time” and “stop time”

-Input a value for both intervals (Interval should not excede 40 secs)

-Click ok and close “Get info” window

-Now right click on that music again and select “Convert to AAC”

-Now you should find same music name file in itunes but with different length.

-Drag that file on to your desktop

-Delete the new AAC file from iTunes

-On your desktop, rename the extension from “.m4a” to “.m4r” of the file that was just dragged

-Drag the file back into iTunes library.

It should now show up in ringtone section. Just sync your iPhone and voila!

If you run into any problems, just leave a comment and I will get back to you.