Tag My Doc is a new service that allows you to assign and print a QR code on your documents. The process is very simple. Just upload your document and let Tag My Doc generate a QR code for it. You can then print out your document with a QR code on it. The free version of the service allows you to store up to 1GB of documents on your Tag My Doc account, password protect your documents, and choose the placement of the QR code on your document.