makehumancommunity.org

Hello
Don't know if I can write there, but maybe someone has a paid account for Converters to MP4 online?

There is a famous converter.
I need get compressed versions of MP4 to get down the size.

I think you can achieve this with the free tool ffmpeg. For example if you want to change scale:

ffmpeg -i input.mp4 -vf scale=320:240,setsar=1:1 output.mp4

Or, to change codec and lower quality, see https://unix.stackexchange.com/a/38380