Generating a 7-Digit Barcode Number

Generating a 7-Digit Barcode Number

Below is the build sequence for a 7-digit barcode number.

7-digit barcode example

Suppose the 7-digit company barcode number 869XXXX has been assigned. The firm wants to number three items: a table, a long-sleeved blouse, and a shirt. Each item receives a GTIN that combines the 7-digit company prefix with the firm's own item reference and a check digit at the end.

• Company prefix: for example, 1234.
• Item number: a sequential number assigned by the firm, usually starting at 1.
• Check digit: calculated automatically by the barcode system.

Why the company prefix length matters

A shorter company prefix leaves more room for item references under that prefix, which suits manufacturers with a wide product range. A longer company prefix leaves less room, which suits smaller firms with a narrow product range. GS1 Türkiye assigns the prefix length based on the annual turnover declared at application time.