To convert YouTube videos to M4R for making iPhone ringtones, first you need to convert a specific YouTube video to M4R, and if the file is more than 40 seconds, you need to further shorten the length as Apple limits all ringtone files to 40 seconds. It sounds a little complicated. Fortunately, WonderFox HD Video Converter Factory Pro offers the most straightforward and handy solution. It’s a multiple-purpose program coming with YouTube video converter and iPhone ringtone maker, which allows users to fast convert YouTube files to M4R and cut the desired part from the file. With it, you’re also able to convert YouTube to a wider range of other formats for your different usages. The whole operation is as easy as a charm. Download the all-in-one toolkit and let's get started.