Scope
Assumptions and limits
Scanning depends on symbology support, printing, scale, contrast and quiet zones. Retail use may require an officially issued identifier.
Results use the values you enter and the conventions described in the methodology below.
Explore business and document tools for related tasks in this collection.
01
Barcode image versus product number
This tool renders the value you enter. It does not assign ownership, purchase a number or register a product with a retailer.
02
Formats and check digits
Code 128 suits broad internal text; Code 39 uses a smaller uppercase character set. EAN, UPC and ITF use strict lengths and GS1 check digits.
03
How the GS1 check digit works
From the rightmost data digit, alternating values are multiplied by 3 and 1. The digit that brings the sum to a multiple of ten is appended.
04
SVG, PNG and scan testing
SVG is preferred for scalable printing; PNG is convenient for common digital use. Preserve quiet zones and test default and final sizes.
FAQ
Frequently asked questions
Does this register a product number?
What is a check digit?
Which format suits inventory?
Can I download SVG?
Can I use colour?
Why will a barcode not scan?
Sources
Method references and scope
Method: results come from tested code using the documented method and assumptions shown on this page.
Review owner: Great Future Product Engineering.
Method and content last reviewed: . Next review due: .