Code 128 includes 108 symbols: 103 data symbols, 3 start symbols, and 2 stop symbols. Each symbol consists of three black bars and three white spaces of varying widths. All widths are multiples of a basic "module".

A Code 128 barcode symbol can encode letters, digits and control characters (TAB, ENTER etc.) which makes it very versatile and suitable for many applications. Today, Code 128 is one of the most widely used barcode types, for example for warehouse management, in the transport industry (e.g. by UPS or DHL) and in retail.

Code 128 barcode is a high-density linear barcode symbology, which encodes digits, text, control characters, and full ASCII 128 characters. Code 128, also known as ANSI/AIM 128, ANSI/AIM Code 128, USS Code 128, Uniform Symbology Specification Code 128, is a very capable linear barcode of excellent density, high reliability.

Code 128 includes 108 symbols: 103 data symbols, 3 start symbols, and 2 stop symbols. Each symbol consists of three black bars and three white spaces of varying widths. All widths are multiples of a basic "module".

The Code 128 barcode is a high-density linear symbology that encodes text, numbers, numerous functions, and the entire 128 ASCII character set (from ASCII 0 to ASCII 128.) It is commonly used for several implementations; and is also referred to as ISBT-128, GS1-128, UCC-128, EAN-128, and USS Code 128.

Code 128 is a high-density linear barcode symbology used for alphanumeric, variable length barcodes. It can encode all 128 characters of ASCII and, by use of an extension symbol (FNC4), the Latin-1 characters defined in ISO/IEC 8859-1.

Code 128 was invented in 1981 by Ted Williams of Laserlight Corporation to solve the problem of representing both alphabetic and numeric characters without sacrificing barcode density. Code 128 enables you to encode all 128 ASCII characters, as Code 39 - Full ASCII does.

Previously called the UCC-128, the GS1-128 barcode can carry up to 48 characters of information and can include a wide variety of attribute data such as batch/lot information, serial number, expiration date or country of origin.

Code 128, so called because it can encode all 128 ASCII characters, is the preferred symbology for many barcode applications. It also is considered the most easily read barcode with the highest message integrity. Code 128 has three different character sets defined in the table below as Code Set A, Code Set B and Code Set C.

ISO/IEC 15417:2007 specifies the requirements for the bar code symbology known as Code 128. It specifies Code 128 symbology characteristics, data character encodation, dimensions, decoding algorithms and the parameters to be defined by applications. It specifies the symbology identifier prefix strings for Code 128 symbols.