ITF-14 Checker
Enter 13 digits to compute the check digit, or 14 to validate.
How to use in 3 steps
- 1
Enter the number
Enter 13 digits to compute the check digit or 14 digits to validate.
- 2
Review the result
See the validity status and the modulo-10 math step by step.
- 3
Check in bulk
Validate multiple ITF-14 numbers at once.
Example input / output
Input
1869123456789
Output
18691234567895 · check digit 5 · valid
Technical notes
ITF-14 is an Interleaved 2 of 5 barcode carrying a GTIN-14, typically used on cases/cartons (a grouping of trade units). The first of the 14 digits is usually the 'indicator' (packaging level); the remaining digits derive from the inner item's GTIN and the last digit is the check digit.
The check digit is computed with the same GS1 modulo-10 method as GTINs: weights 3 and 1 applied right to left. So the math is consistent with the check digit calculator and GTIN validator.
ITF-14 is physically robust and suitable for printing directly onto corrugated cardboard, which is why it is framed by a 'bearer bar'. The bearer bar reduces misreads caused by incomplete printing or edge damage.
Interleaved 2 of 5 only encodes digits and requires an even digit count; ITF-14 is exactly 14 digits. For the concept, see what is ITF-14.
Frequently asked questions
EAN-13 is for the individual retail unit (GTIN-13); ITF-14 carries the case/carton-level GTIN-14 and is designed for more durable printing.