ITF-14 barcode generator with check-digit validation
Enter the first thirteen GTIN digits to calculate the final check digit, or enter all fourteen digits to validate them before a symbol is rendered. The output stays in your browser and does not issue or license a GTIN.
A valid symbol always carries fourteen digits
ITF-14 divides the complete number into seven pairs. The first digit in a pair selects five bar widths and the second selects five space widths. The start and stop patterns frame the data, while the check digit helps the scanner detect an incorrectly composed number.
- ✓A thirteen-digit body is completed with a calculated check digit.
- ✓A supplied fourteen-digit value is rejected when its final digit does not match.
- ✓The preview keeps left and right quiet space plus top and bottom bearer bars.
A clean SVG is not a GS1 allocation or print grade
The browser can draw the correct logical pattern, but packaging ownership, physical size, ink spread, contrast, placement, scanner setup, and verification remain production decisions. Test the actual label from the actual printer before a case enters distribution.
- ✓Start with a GTIN allocated for the intended trade-item grouping.
- ✓Do not crop the quiet zones or bearer bars during artwork placement.
- ✓Ask the relevant GS1 organisation or trading partner about assignment and verification rules.
Continue from calculation to workflow
Use the result as an input to planning—not as a standalone system decision.
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