The ITF-14 Barcode Guide: Why Corrugated Shipping Boxes Need Bearer Bars

Why Standard Retail Barcodes Fail on Cardboard Boxes

If you have ever examined a large corrugated cardboard box arriving at a retail store, you may have noticed that the barcode printed on the side looks distinctly different from the code on the individual retail items inside. The bars are wider, the spaces are more generous, and the entire barcode is framed by a heavy black rectangular border.

That code is an ITF-14 barcode, and its distinct appearance is the result of careful packaging engineering.

When packaging converters print barcodes directly onto corrugated kraft cardboard using high-speed flexographic presses, ink naturally absorbs and spreads along the porous flutes of the paper. Standard retail barcodes like EAN-13 have fine lines that quickly bleed into adjacent spaces, causing automated warehouse scanners to fail. The ITF-14 standard was designed specifically to overcome these rough printing conditions.

How Interleaved 2 of 5 Encodes Information

The ITF acronym stands for Interleaved Two of Five. Unlike standard barcodes where each digit is represented strictly by a set of dark bars, ITF pairs digits together:

The first digit in a pair is drawn using dark bars, while the second digit is encoded into the light spaces between those bars. Within each group of five elements, exactly two are wide and three are narrow. This unique interleaved structure gives the barcode exceptional optical tolerance, allowing scanners to interpret the data accurately even when ink spreads across rough corrugated textures.

The Engineering Purpose of Bearer Bars

The most recognizable feature of an authentic ITF-14 code is the thick black border surrounding the bars, known as bearer bars. These bars serve two essential functions:

During flexographic printing, heavy mechanical cylinders press printing plates against uneven cardboard sheets. Without a protective border, the plate can flex under pressure, flattening and distorting the delicate barcode lines. Bearer bars absorb and equalize this mechanical pressure, keeping the internal bars sharp and uniform.

Bearer bars also protect against partial optical scans. If a warehouse worker sweeps a handheld scanner diagonally across an unprotected code, the laser might only read a fraction of the digits. Bearer bars provide an immediate barrier that forces the scanning beam to read the complete 14-digit sequence from edge to edge or reject the read entirely.

When exporting ITF-14 codes from our Barcode Studio, always export vector SVG files to ensure bearer bar thicknesses and line proportions match official GS1 specifications.