QR codes that never expire
Paste a link and the code appears as you type. Your information goes inside the code itself, so there is no short link in the middle that can stop working, nothing to renew, and no account.
The https:// is added if you leave it off.
Your code appears here as you type.
Other kinds of code
Why these do not expire
Many QR generators give you a code that points at their own domain, which then redirects to your link. That is how a code can be edited later, and also how it comes to stop working: it depends on somebody else's service still being there, still free, and still willing to serve it.
These codes hold your information directly. The trade is honest and worth stating: you cannot change where one points after it is printed, and nobody — including us — can tell you how many times it was scanned. In exchange it keeps working whatever happens to this site.