Just upload the .mp4 file to any video uploading website. Unfortunately, I don't have much experience with uploading content, but I'd assume YouTube would be pretty simple to get started on (well, assuming you already have a YouTube account, which, if you're already associated with Google, isn't an issue).
Can OBS upload as a windows movie-file?
I'm not entirely sure what you mean. You can, if you want, run the file through Windows Movie Maker, though that considerably lowers the quality while taking a long time.
I want to convert it into GIF's, since that would take less time.