ITF-14 Barcode Generator - Free GS1 Master Carton Barcodes with Bearer Bars SVG & PDF

ITF-14 Engineering Manual: Corrugated Substrate Tolerance, Bearer Bars & ISO/IEC 16390 Standards

While retail checkout lanes rely on UPC-A and EAN-13, the distribution warehouse environment operates on a vastly different physical scale. Shipping cartons travel along high-speed automated sorting belts, endure rough forklift handling, and are fabricated from coarse, unevenly absorbent corrugated kraft paperboard. Standard retail barcodes fail in this harsh environment. To conquer corrugated substrate irregularities, GS1 and the International Organization for Standardization established the ITF-14 (Interleaved 2 of 5, 14 digits) symbology under ISO/IEC 16390.

The Two Essential Engineering Roles of Bearer Bars

The most visually distinctive characteristic of an ITF-14 barcode is the heavy black border encasing the symbol, formally known as “Bearer Bars”. Many software packages omit Bearer Bars, which immediately disqualifies labels from retail distribution center compliance:

1. Mechanical Plate Stabilization (Flexography): In industrial flexographic printing, flexible photopolymer printing plates rotate against corrugated carton board. The flutes in corrugated paperboard create alternating high and low pressure ridges. Without Bearer Bars, the printing plate dips into the valleys between bars, crushing the photopolymer edges and causing severe bar widening (ink spread). The heavy outer Bearer Bars support the plate rollers across the entire width, maintaining constant pressure and uniform bar widths.
2. Elimination of Short-Scan Misreads: Interleaved 2 of 5 is a continuous, self-checking symbology that does not have start/stop characters with distinctive parity encodings. If a barcode scanner beam sweeps across the symbol at an acute diagonal angle, it can exit through the side of the bars. A scanner might read 6 or 8 digits out of the 14-digit number and mistakenly transmit a valid partial barcode. When Bearer Bars are present, any beam crossing the edge strikes a solid black wall, causing the scanner decoding logic to abort the invalid read.

Packaging Level Indicator Hierarchy (0 to 8)

An ITF-14 barcode encodes 14 digits, structured as:

The leading Indicator digit tells the warehouse management system (WMS) what tier of packaging is being processed:

• 0: Assigned when the carton contents have a distinct GTIN that is already globally registered.
• 1 through 8: Represents increasing packaging hierarchies. For example, a single retail tube of toothpaste has a UPC of 012345678905. An inner pack of 6 is assigned ITF-14 10012345678902. A master shipping case of 36 is assigned ITF-14 20012345678909. A full warehouse pallet of 432 units is assigned ITF-14 30012345678906.

Magnification & Dimensional Rules for Warehouse Automation

Under GS1 General Specifications, ITF-14 barcodes must be printed within a strict magnification range between 50% and 100%:

• 100% Target Size: X-dimension of 1.016 mm (40 mil), bar height of 31.75 mm (1.25 inches), total length of 152.4 mm (6.0 inches).
• Minimum Allowable (50%): X-dimension of 0.508 mm (20 mil), bar height of 15.88 mm (0.625 inches). Barcodes printed below 50% magnification cannot be reliably read by conveyor-mounted overhead laser scanners.

LabelQueue enforces strict geometric ratios in vector PostScript space, ensuring your master carton labels pass commercial barcode verifier audits with an ISO grade of A.