Make-iPhone-Ringtone.com - As with most of the others, you upload your file and select which portion you want to make into the ringtone, but it offers a wider variety of unloadable formats: AAC, MMF, MP3, MP4, OGG, QCP. Choose your download via the site, delivered to your phone, or even have it emailed to you. This iphone ringtone maker can make you fast and safe enjoy create the rings.

mobicious.com - Upload an MP3 you own, and choose any 20 seconds of it to make into a ringtone to be sent to your phone. Best of all, the service is free.And you can also convert WMA to MP3 ringtone freely!

RingBlender.com – Create your own ringtones from scratch using their various presets for different instruments, or make your own remixes of songs from bans such as The Polyphonic Spree or The Dandy Warhols. Each ringtone will cost you $2.99.

ToneMine.com – Lets you start with your own music and then add numerous sound effects from their preset library. You can save your tone and reopen it for more tweaking later on, as well as create a social profile to share and browse what others have created.

If you want to transfer the file from the iphone to the computer, you can see the iphone to computer link.