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WinForms is solely a desktop technology. Furthermore, it's Windows-only technology.
HTML5 is solely a markup language so it is nothing more than a visual representation of your app. Still, as you've mentioned uploading cards this means to me that you need a backend to persist it.
The way I imagine it is that you have a backend server (you might use .net core for that). And you have clients for platforms you need to support. Once the backend server if not available for some reason you persist data in a client's local storage. Otherwise, you persist it on a backend.
I think you should research more on a client-server programming model.

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