WonderFox Free HD Video Converter Factory can convert WebM to iPhone supported formats in one click. You don't even need to know which formats your phone supports, as the program provides optimized ready-to-use presets for a variety of Apple devices, including the latest iPhones, iPads, iPods and Apple TVs. It can also be used as a functional free video downloader to download online videos to MP4. Download the software and follow the section below to learn more about how to view WebM on iPhone.