There are many small, inexpensive digital video recorders available today. The majority of these camcorders produce MP4 files and these files can be relatively large; depending on the device and setting used, one minute of MP4 can be between 25 – 150 MB. We often need our files to be smaller – for posting online, for sharing with others, and for storage. This document reviews four free or low cost applications that can be used to compress video files. Note: This document is updated and reposted periodically, so please send me your suggestions.