This is a cute but basic app that is almost portable if you apply the strictest definition of a portable app, one that leaves no traces behind. In this case you get a new registry key at: HKCU\ Software\ Microsoft\ VS\ ServiceModules\. Installation adds an empty folder in Users\ [UserName]\ AppData\ Roaming\. And the single file takes up ~6MB. It accepts text input or you can import/open a text file with multiple entries. The help page with instructions & options, e.g., using it from the command line, is here:
vovsoft[.]com/help/bulk-qr-code-generator/