Knowledge Base

Encoding FNC1 character into GS1-128 bar code


The bar code standard GS1-128 defines the structure of data encoding. The standard defines the Application Identifiers (numbers in parenthesis) and the data for each of those Application Identifiers (AI). The AIs can be numeric, alphanumeric, and can have fixed or variable length.


Note: You do not have to enter the FNC1 characters manually into your bar codes. NiceLabel does this automatically, when necessary.

Rules for Encoding FNC1 Character:

  • NiceLabel inserts the Star Character and FNC1 character at the beginning of the bar code GS1-128 automatically.
  • NiceLabel adds the FNC1 character at the end of all variable-length AIs. If the value for AI fills all defined characters, or if the value ends prematurely.
  • NiceLabel adds the FNC1 character at the end of some fixed-length AIs. The GS1-128 General Specifications define exactly when the FNC1 must be added at the end of AIs.
  • If you use several AIs in the same bar code, put the fixed-length AIs at the beginning and variable-length at the end of the bar code definition.
  • The last AI in the bar code must not be followed by the FNC1 character, even if it should have the FNC.
  • The FNC1 character is not a visible character. It does not show in the human interpretation of your bar codes. Only bar code scanners read FNC characters. If you mistakenly insert the FNC characters at the wrong places, NiceLabel encodes them as data values for your bar codes.

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