Convert AVI to M4R
AVI to M4R Converter is widely-used iPhone Ringtone Maker with superfast speed and great output quality!
Besides, it supports to convert a wide range of video and audio formats such as MPEG, WMV, MP4, DivX, MOV, RM, AAC, WMA ect. Meanwhile, pre-listen, upload to iPhone directly are supported as well!
Screenshot:

Simple Guide: Convert AVI to M4R
Free download AVI to M4R Converter and import files
by clicking the button "Browse".
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Clip segments from the source file by dragging sliders or by setting exact time value.

Set output path.
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Check the item
to upload M4R files to iPhone directly.
Click the button "Generate" to start converting.
From the moment you own it, you can easily enjoy varified iPhone ringtones!