Abstract: Computer-implemented methods and systems for efficient alphanumeric encoding for arbitrary payload data are disclosed. The computer-implemented method, performed by a server system, includes accessing URI-oriented payload data. The method further includes converting the URI-oriented payload data into an alphanumeric data type based, at least in part, on an alphanumeric encoding method. The alphanumeric encoding method may be one of BASE36, BASE37, BASE38-QR-URI-UNRESERVED, BASE42, BASE45, Base64, Base66, Base183, and Base191. The method further includes generating a machine-readable code based, at least in part, on the converted URI-oriented payload data.