Compression ratio an exporting to video file

I’ve recognized that the file size of rendered videos e.g. mov or mp4 in 1920x1080 resultion with 30fps is about 3GB for a 20min movie. I think ist is absolutely uncompressed and not suitable upluding that file to any web space. My Worksaroud for nows is to compress the file with 3rd party tools. Therefore i get a size about 1GB which fits matches the FM5 presentation size.
I think a compression ratio adjustment would be fine.