Code 128 is widely implemented in many applications to encode both alpha-numeric data and numeric-only data. Code128 has three subsets: code128A, code128B and code128C.

Code 128A is used to encode uppercase alpha and control characters.
Code 128B is used to encode both uppercase and lowercase alpha and numeric data.
Code 128C is used to encode numeric-only data.

Code 128 has many variations, like EAN 128, ISBT 128, etc. It has become mandatory to use UCC/EAN Code128 symbology to print bar coded labels of Confirmation Services since the year of 2004. USS Code128 also uses subset C to encode label.

A check digit is always required. When you use Barcodesoft Code128 font to print bar code, checksum calculation utility is provided in multiple programming languages.

There are 28 fonts provided in the package as listed below, marked by different trailing indicators. They are available in both true type and PostScript formats.

Aspect Ratio	No Human Readable	Set A with HR	Set B with HR	Set C with HR
XXS	Code128XXS	Code128AXXSHr	Code128BXXSHr	Code128CXXSHr
XS	Code128XS	Code128AXSHr	Code128BXSHr	Code128CXSHr
S	Code128S	Code128ASHr	Code128BSHr	Code128CSHr
M	Code128MS	Code128AMHr	Code128BMHr	Code128CMHr
L	Code128L	Code128ALHr	Code128BLHr	Code128CLHr
XL	Code128XL	Code128AXLHr	Code128BXLHr	Code128CXLHr
XXL	Code128XXL	Code128AXXLHr	Code128BXXLHr	Code128CXXLHr