At the moment, this exists because the web has way too many scammy QR code generators, and sometimes I just want to make a QR code without hitting a terminal.
Segno is awesome (it makes properly spec-compliant QR codes with tons of configurability), and we used it on canarytokens.org, but you can only use it from Python or the CLI.
As an MVP, this project uses none of that configurability, but gives you a static page that can produce QR codes on the client-side with reasonable defaults in <100 LoC.
To keep it dead simple, I used PicoCSS and _Hyperscript. To get Segno running in the browser I used Pyodide.
If you would like to run it yourself, you can host a copy of src/ by whatever means you like.