Barcode Check Digit Verifier

Verify check digits for various barcode standards

JANバーコード
JAN / EAN
UPCバーコード
UPC
CODE39バーコード
CODE39
ITFバーコード
ITF
日本語English
JAN/EANUPCCODE 39ITF

ITF Code Verification

ITF (Interleaved 2 of 5) is an industrial barcode that can only represent numbers and always consists of an even number of digits. The last digit is commonly used as a check digit. We calculate the check digit using the Modulus 10 algorithm (weight 3-1).

About ITF Barcodes

History

ITF (Interleaved 2 of 5) was developed in the 1970s specifically for industrial applications where numeric-only data needs to be encoded efficiently.

Learn more about ITF history →

Structure & Format

ITF encodes data by interleaving two digits at a time, with bars representing the first digit and spaces representing the second digit, resulting in a more compact barcode.

View ITF structure →

Check Digit Formula

The check digit is calculated using the Modulus 10 algorithm with alternating weights of 3 and 1, similar to UPC/EAN barcodes.

View calculation method →

Applications

ITF is commonly used in warehousing, distribution, and manufacturing for shipping containers, cartons, and heavy packaging materials.

ITF applications →