WebM is a high-quality and open media file format based on a profile of MKV. It supports VP8 video and Ogg Vorbis audio track, which enables it to fluently play on various devices and platforms like netbook, tablet, YouTube, Chrome, Adobe Flash Player, etc. People may know a number of ways to get WebM videos; but when it comes to consolidation of these videos, they are out of an idea. Fortunately, here, this post presents 4 best video joiners to combine WebM files without let or hindrance.