iPhone is more and more popular, if you are iPhone user and you are board with iPhone's build-in ringtone, this step by step guide will help you a lot. It will show you how to use iTunes to make free and cool personal ringtone for your iPhone, even you are new iPhone user can manage it. This guide works for all series of iPhone including iPhone 5, iPhone 4, iPhone 3GS, iPhone 3G and iPhone original.
Step1. Right-click on the song in iTunes and select 'Get Info' from the pop-up menu. Choose the Options tab and change the Stop Time to 0:30 for 30 seconds of play time.This won't change or damage the actual file; it just tells iTunes to only play the first 30 seconds of the song (plenty of time for you to answer your phone). You can change this setting back to full length after you create your ring tone.
Step2. Configure the MP3 Encoder built into iTunes to use 22khz and mono encoding (the format used by iPhone or cell phone ring tones).Click the Preferences menu and then choose the Advanced tab. Click 'Importing' and then choose 'MP3 Encoder' from the Import Using drop down. Choose 'Custom...' from the Settings dropdown, which will display an 'MP3 Encoder' dialog like the one shown below.
Step3. Convert the song to ringtone MP3 format by right-clicking it in iTunes and selecting 'Convert Selection to MP3' from the popup menu. iTunes will make a copy of the song and you'll see that the time will change to 30 seconds. Send the ringtone to your phone using a usb data cable or Bluetooth. If you want to convert video to mp3 to make ringtone on Mac, this video to mp3 converter (http://macvideoconverter.mac-dvd.com) will help you a lot.
NOTE: Do not select 'Create Ringtone', as this option will charge your account, and also only works with songs you have purchased through the iTunes store.
Step4. You'll need to download software to transfer your new ringtone to your phone via Bluetooth or a USB data cable, something phone manufactures don't include with their phones. If you're using a USB data cable, then I recommend DataPilot - it works with all major phone types and lets you transfer ring tones, photos, videos, contacts, etc. If you're using Bluetooth to transfer your ring tones, then Ringtone Media Studio is worth looking at. It lets you transfer ring tones to your cell phone using a bluetooth connection AND automatically creates ring tones from your favorite CDs and MP3s, without all the manual steps required by iTunes.
Step5. Now that the ringtone is on your iPhone, you can set it as your iPhone default ringtone. With the tricks described in this article you can make iTunes create free ringtones for you, or you can use Ringtone Media Studio to make it even easier to create free ringtones out of your favorite music.