Barcode Xpress for .NET Framework v13.9 - Updated
Add-2 Barcode Specification
Supported Barcode Types > Barcode Types > Add-2 Barcode Specification

The Add 2 barcode is a numeric 1D barcode that encodes 2 digits of information. It is often used to provide supplemental information about other barcodes, which is why it is also referred to as an "add-on symbol". Add 2 barcodes have no error detection or correction mechanisms.

Example Barcode

The following example barcode encodes the information 02 as an Add 2 barcode:

Add 2 barcode


The Add 2 barcode encodes exactly two digits of information and has a symbol length of 25 modules. This barcode is similar to the Add 5 barcode in that they are both intended to provided supplementary information concerning a "primary" barcode.

This "primary" barcode (usually a UPC/EAN variant) would generally identify the product, while an Add 2 "add-on symbol", usually to the right of the "primary" barcode, would specify additional information such as the product's edition. 1

This can be seen in the following example:

UPC-A barcode with Add 2 barcode

Managing Organization

The Add 2 barcode is managed by the GS1 (Global Standards One). 1

Similar Barcode Types

Add 2 barcodes are also referred to as "Two-digit add-on" barcodes.

Barcode Variants

The Add 2 barcode is similar to the Add 5 barcode in that they are both intended to act as extensions for UPC/EAN barcodes.

Related Barcodes

EAN and UPC variants (EAN-13, UPC-A, and UPC-E) are usually used as "primary" barcodes to which Add 2 barcodes would provide supplementary information.


  1. "GS1 Standard Specifications." GS1, GS1 Organization, Jan. 2020,

For additional background and use-case information see our Add 2 barcode page.
For more information, see the Barcode Xpress SDK product page or try our online demos.

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