Interleaved 2 of 5

I25SampleInterleaved 2 of 5 (also known as I 2 of 5, I2/5, Code 25, or ITF)  is a binary code that is widely used in logistics supply chains, most notably on corrugated cases.  It uses a clever scheme of “interleaved” characters, where a set of bars and spaces comprised two data characters: one encoded in the bars and the other encoded in the intervening spaces.  The structure of an I25 bar code consists of a start character consisting of four narrow elements, followed by an even number of data characters, followed by a stop character consisting of a wide bar, a narrow space, and a wide bar.  A specific implementation of I25 defined by GS1, known as ITF-14, uses a Wide:Narrow ratio of 2.5:1 and is widely used on logistics supply units (typically corrugated boxes) to encode a 14 digit GTIN.
TypeLinear (1D)
Character SetAll ASCII characters and binary data, using several efficient modes of encoding and data compression.
Example of Application Standards135 mm film
Non-standardized applicationsLogistics supply chains, Identcode and Leticode are variants of the code with check digits used by Deutsche Post.
Key featuresA check digit can be the last digit in I 2 of 5.
Any of Webscan’s linear verifiers can verify I25 bar codes.  You can select normal ITF, or ITF-14 which uses GS1 verification criteria. Learn more about Interleaved 2 of 5 Verifiers.