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Nice! This looks like a similar idea to [1] Zero Width Shortner, except you can actually see the characters!

[1] https://zws.im/

Thanks for linking that! It looks like zws is using Firebase as a backend store to save the links while this just encodes it into the unicode.

I wonder if there's enough valid whitespace characters to store a meaningful amount of bits in...

Neat idea but impossible to type unless I am missing something. I built a url shortener using hashids https://t.ly/