• Subset – This is the subset (or character set) used when generating the barcode. Code128 offers three main subsets:

  • A: Includes control characters and special symbols from the extended ASCII range.
  • B: Contains letters, numbers, and most standard ASCII characters.
  • C: Optimized for purely numeric data, making it efficient for encoding long strings of digits.

  If you’re unsure which subset to pick, Subset B is generally suitable for most applications.

• Thickness – This controls the thickness of the barcode lines. Adjusting it affects how the barcode looks visually, allowing you to make the lines thicker or thinner. In some cases, thicker lines can be easier for scanners to read—especially if you need a large barcode or you’re dealing with lower-quality printing. However, for most situations, the default thickness works just fine.

To generate a barcode, simply provide the content (text or numbers), select the Subset, and, if necessary, adjust the Thickness. The result is a barcode that’s ready to print and use for labeling or streamlining inventory management.