The guide will explain how to easily create your iPhone ringtone from any
video/audio files.
Firstly,
download,
install and launch the
Xilisoft
iPhone Ringtone Maker. Then, the main interface pops up.

1. Click the "Browse" button right beside "Input File" label to select the
file you want to create ringtone in the window that pops up, then click "OK"
button. You will see the file path and name are displayed in the "Input File"
textbox.
2. Click "Play" button to hear the music before creating ringtone and find
the part you want to use. Then drag and drop the start & end slider to get
music clip to convert, or type the start & end time in the corresponding text
box directly.
3. Set output destination by clicking "Browse" button on the right side of
the "Local Output File" label.
4. If you want, check "Export to iPhone" option to let the program upload
the output ringtone to your iPhone directly after conversion. 5. After all
above are finished, click
"Generate" button to start creating your own iPhone ringtone. During the
creation, you can check the process by the progress bar at the bottom.
Just in a few minutes, you make your own iPhone ringtone from the loved
music.