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Yeah like the other replies said, it's meant to be part of a link shortener; or maybe you have a short domain that you can use short urls with. Like surprisingly enough I could fit a link to my github page in there as plaintext (although all caps)

I went ahead and made it so you can put your own urls at 25 characters or less [0], and updated the live site too [1].

[0] https://github.com/kochrt/qr-designer/commit/55d4de3f856828b... [1] https://robko.ch/qr-designer/

I could imagine this being part of an offering that includes an appropriately customized URL shortener (or if necessary, lengthener).

For shorter URLs you could pad it with unused query strings

Definitely. I would love to be able to customize the design area and get matching amounts of data to be entered.