Add-on lets you quickly encode URL of the form into a QR code. This QR code can be then used to access the from from mobile devices by scanning the QR code.
Size - size of QR code
Add to Form - if enabled QR code will be added to the form
Save to Document - if enabled QR code will be saved into a Google Document. You can edit the document and print out if needed.
Save as PNG - if enabled QR code will be saved as PNG file on Google Drive