When you want to hide some URL parameters from users, there is a simple way how to do it. Be aware that more experienced users can read it anyway, so this is not a way how to send confidential data, just to make URL address not readable at first sight.
For this problem, we can use base64 encoding. There are functions in various programming languages for encoding and decoding base64.
var enc = btoa("Hello world");
Instead of Hello world we will get string SGVsbG93IHdvcmxk.