Reddit profile links are long — codes fix that
Reddit profile URLs carry a prefix most people forget: reddit.com/user/yourname, not reddit.com/yourname. Written on a poster or a slide, that's an easy thing to get wrong, and a wrong guess lands on an error page. Encoding it removes the prefix problem entirely.
The natural uses are promotional rather than social: an AMA announcement, a zine or print project where you want credit, a conference talk where your post history is the portfolio, or a product insert pointing at a community you run.
If you want people to land on a subreddit rather than your profile, switch to "Any link" and paste the r/ URL instead — communities are usually the better destination when the code is aimed at strangers.
Everything happens in your browser. The QR encoder is built into this page, so your username is never sent to a server, nothing is logged, and there's no daily limit. The code is static — the link lives in the pattern itself, with no redirect service in the middle that can expire, start charging or go down.