Step 1: Download and Install the Encoder and Font

IMb consists of a 20-digit tracking code field [Barcode Identifier, Service Type Identifier (STID), Mailer ID (MID), and Serial Number] and a Routing Code (ZIP Code) field of up to 11 digits. An encoder is required to convert the numeric digits into a 65-character string representing the bars of the IMb tracking code, and a special font is required to convert the 65 alpha-character string into the IMb bars. Users can download the fonts and computer source code at https://postalpro.usps.com/resources/mailing/encoder-software-and-fonts.