Hacker News Reader

Nice, I made one of these a few years ago http://passfiles.com

Yours is a bit more polished than mine though. I didn't use QR codes either just good old fashioned urls.

There seem to be hundreds of these sites. They all do the same thing. Off the top of my head I can remember https://file.pizza

file.pizza and friends work on webtorrent, which doesn't do end-to-end encryption

EDIT: just learned that WebRTC actually does end-to-end encryption by default, so I'm wrong