I use MP3 Trimmer to create my ringtones for my Nokia N95 using a Mac. The latest phones now are capable of playing mp3′s as ringtones. While some people buy ringtones from websites or their carriers, I choose not to pay and do it myself. I’ll show you how to do it yourself using a pretty cool app called, MP3 Trimmer by deepNiner.

You can simply transfer an MP3 song to your phone and use it as a ringtone, but sometimes you don’t want the ringtone to start at the beginning. I personally use the chorus or the catchy part of a song. What I like about MP3 Trimmer is the ability to fine-tune when you want the ringtone to start or end frame by frame.

Open up iTunes and drag any song from your library to MP3 trimmer. It will now look something like this.

Press playback to hear the song and then press the Set button under the IN-point section during the part where you want the ringtone to begin. The song will keep playing, but notice that anything before the set point became darker.

Then press the Set button under the OUT-point during the part you want it the ringtone to end. The song now stops playing. I usually estimate about a minute after my starting point because the call would probably be in voicemail by this time.

Press the Try button under either the IN or OUT points to edit the points frame by frame. The minus (-) obviously moves back the point by one frame, while the plus (+) moves it forward. Press done when you are satisfied with the micro editing.

That’s it! Save the file, transfer it to your phone, and set it as your ringtone. Your friends will be amazed that you always have the latest ringtones when you pick up phone calls…

You can also try playing with the options like fade-ins and outs. I personally don’t use it, but give it a try if you like.

If you have a Mac and use something else for ringtones, let me know. I have probably used three other apps until I found MP3 Trimmer. I never looked back.