Every tool has its own targeted users, and the provided functions are also different. So, if you can find a free online video editing software, which can satisfy all your editing needs, then just use it to create your awesome movie. If you can't find an ideal tool, you can also take a free trial on desktop software, because this kinds of tool always works well than the online software.
January Update: Content Samurai is going through a rebranding phase to turn into Vidnami. Same software, same team, just a different name and logo. And while this transition is in its finalizing stages, you can take advantage of the team’s lastest promotion and lock in your special discount on the Content Samurai (Vidnami) monthly plan by purchasing it directly through this PayPal checkout page, provided by the Content Samurai (and Vidnami) team ($47/m $35/m).