HandBrake
This is the video editing program I use to compress, crop, resize or trim video. HandBrake is more of a video processor or transcoder than a video editing studio.
When you already have a video made, but need the file to be smaller in filesize you have a lot of control with HandBrake. You can even choose the Kb/s you would like to encode it for. You can even downsample, such as making a 1080p video into a 720p video.