1-D (one-dimensional) barcodes are horizontal and linear, consisting of vertical lines that vary in widths with specific spaces in-between each line. The combinations result in particular patterns that make each barcode unique to each particular product.
Depending on the type, 1-D barcodes are contrived of:
- Numeric-Only – consists only of numbers (0-9)
- Alpha-Numeric – consists of both numbers (0-9) and letters (A-Z)
1-D barcodes are wider in size but limited to how many characters they can hold, typically between 8-25 but possibly as many as 85 total. This also limits the amount of information they can carry. 1-D are most commonly found on consumer goods in retail environments, but are used in other establishments such as libraries, hospitals, and warehouses.
The most common 1-D barcode type is the UPC (Universal Product Code), which is found on virtually every type of consumer packaging in the US. These barcodes are scanned at the point-of-sale with a handheld or stationary scanner.