Not just for slowing down or speeding up videos, the Filmora can also be used for a wide array of functions, such like slippting, cropping or reversing videos, and other advanced features like green screen, PIP, and face-off. Top 10 Slow Motion Video Editing Software 1. Here is a list of some of the best video editor to make a video slow down in the market. If you want to slow down a video to show more detials or transfer a kind of atmosphere to a video, you will need a video editing software to do it. Slow motion effects can add a 'close-up in time', and introduce a feeling of surreality.