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

I’ve been using HandBrake for this kind of thing. It’s free and pretty easy to use. Just download it, load your MP4 files, and you can tweak the settings to shrink the file size. It’s worked great for me!