bigURL - URL Enlarger

Most URL shorteners store their IDs on a database. Naturally, since I wanted to host this on Neocities, I had to limit myself not to. For this, I decided to use some JavaScript and store the URL we're supposed to redirect to as a URL parameter encoded as base64. This by itself already makes the URL larger. On top of that, we have to consider the domain and subdomain this script is hosted on.
For example, if I wanted to use this method to redirect to:
https://neocities.org/
I'd have to encode the URL as base64 and paste that as a URL parameter, which will be taken as input by the script. The final URL would look like this:
https://xiokka.neocities.org/bigURL/?u=aHR0cHM6Ly9uZW9jaXRpZXMub3JnLw
On red, we can see where the script is hosted on. On green, we see the URL parameter, with the original URL encoded as base64.
This is silly and makes the URL way larger, which defeats the purpose. Oh well.