Any YouTube compressor?

I've been trying to post a short video, but my videos are not in vertical format so every time I upload a short video, it goes directly into videos rather than shorts. Do I need a video compressor because I don't want to trim the video?

It seems you need to create videos 9x16 instead of 16x9 rather than trimming its content

i use this site to make make YT shorts and they upload fine
https://webservice.online-convert.com/convert-for-tiktok