CSV Check Digit Processor

How CSV Check Digit Processor Works?

The CSV Check Digit Processor checks an identifier column in a CSV export. Choose the column and the checksum scheme. Each row is processed, and the results are added as new columns.

1. 1Upload or paste a CSV file exported from a spreadsheet or ERP system.
2. 2Choose the delimiter and the column that holds identifiers.
3. 3Choose generate (add check digits) or validate (check existing ones).
4. 4Process every row and add Check, Result, and Message columns.
5. 5Download the enriched CSV.

CSV Check Digit Processor Formula

The CSV rule is row' = row + [f(row[col]), status(row[col])] for each data row.

for row in rows[1:]:
    value = normalise(row[col])
    row.append(f_scheme(value), status(value))

• col is the chosen identifier column.

Column = gtin
Mode = generate or validate by length
Row 4: 4.00638E+12 → spreadsheet converted the number to scientific notation

CSV Check Digit Processor Conversion Table

The CSV processor table shows a sample export after processing.

Spreadsheets drop leading zeros and turn long numbers into scientific notation. Format identifier columns as text before export.

What is CSV Check Digit Processor?

A CSV Check Digit Processor is a tool that adds or checks check digits for a whole column of a spreadsheet export. The processor keeps every other column unchanged.

The tool flags spreadsheet damage such as lost leading zeros and scientific notation, the 2 most common causes of broken GTINs in product files.

What are the uses of CSV Check Digit Processor?

There are 3 main uses of the CSV Check Digit Processor, including ERP exports, marketplace feeds, and supplier onboarding.

• ERP exports: Teams validate item master exports.
• Marketplace feeds: Sellers fix GTIN columns before upload.
• Supplier onboarding: Buyers check supplier product sheets.