If you want to email YouTube videos as attachments, you can use a video downloader to download videos from YouTube and even cut the portion you need from the videos. Please note that major email service providers have limited the attachment file size at most 25MB to 30MB. Anyway, a good video downloader is necessary. We recommend that you use WonderFox Free HD Video Converter Factory for this task. The program can easily download videos from 1000+ websites including YouTube, Facebook, Dailymotion, BBC, and Twitter. The following part shows you how to use it to download a YouTube video.