YOUR2FA is a fast way to get 2FA codes for logins that aren't high-stakes — a forum, a side project, that kind of thing.
Don't use it for banking, email recovery, or anything you can't afford to lose access to. It intentionally skips the safeguards a dedicated authenticator app gives you, to stay simple.
Everything runs in your browser and nothing is stored. A generated link contains the secret itself, though, so treat it like a password.