X-Dimension
The X-dimension is the width of the narrowest module in a barcode — the single most important number controlling symbol size, density, and scanner compatibility.
What You Need to Know
Every dimension of a linear barcode scales from the X-dimension: bar widths, space widths, quiet zones (expressed as multiples of X), and overall symbol width. A smaller X packs more data per inch but demands higher printer resolution and finer scanner optics. At a 0.19 mm X-dimension, Code 128 achieves roughly 24 digits per inch; doubling the X to 0.38 mm halves that density but makes the symbol far easier to scan with cheap handheld devices.
Retail and logistics standards constrain the X-dimension explicitly. GS1 specifies nominal X-dimensions for EAN/UPC (0.264 mm ≈ 10.4 mils at 100% magnification) and tolerance bands for ITF-14 carton codes, because point-of-sale and warehouse scanners are calibrated to expect them. When a barcode "will not scan" in the field, an out-of-spec X-dimension — often caused by scaling artwork without measuring — is one of the first suspects.
Where X-Dimension Applies
A high-density, variable-length linear barcode that encodes all 128 ASCII characters, and the backbone symbology of modern logistics.
Generate Code 128 →The 13-digit retail point-of-sale barcode used on consumer products worldwide outside North America.
Generate EAN-13 →The original 12-digit retail barcode of the United States and Canada, and direct ancestor of EAN-13.
Generate UPC-A →The GTIN-14 carton-level barcode: ITF with thick bearer bars, printed directly on corrugated shipping cases.
Generate ITF-14 →The 14-digit Global Trade Item Number for cases and inner packs, carried by GS1-128 or ITF-14 symbols.
Generate GS1-14 (GTIN-14) →