Always remember to convert a QR code back to text before printing / distributing it. There are some shady QR code generation sites on the Internet that produce

Always remember to convert a QR code back to text before printing / distributing it. There are some shady QR code generation sites on the Internet that produce codes that work for a week or so, but go to some unexpected third-party domain that redirects to your site. Later, you find out that you have to pay them a subscription fee if you want the QR code to keep working.