Reddit, YouTube, facebook and all of the other social media websites track the urls I copied. Whenever you copy a link, check out, it is not the actual url and/or it contains a track id in the url. I can’t share anything with the people any more, and click their links, because I hate being tracked.
Using Firefox, you can simply “copy clean link” like mentioned here.
Otherwise, learn about query strings, and make an educated guess.
As for apps on various app stores for cleaning links, I have a general aversion to installing random apps, so I can’t help or recommend anything.
If you want to stop them from tracking you, nothing you do to the link will stop them. This can only prevent sites from seeing who you share their link with. Notice I say can, not will. Even my sleep deprived mind can think of a few different ways to write this functionality without using query strings in an afternoon or less.