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Packing list generator
Prepare a package-by-package packing list with weights and dimensions.
Documents & LabelsDOCUMENTS & LABELS
UPC EAN GTIN Barcode Check Digit Validator
Validate the numeric length and GS1 modulo-10 check digit of an entered GTIN while preserving every leading zero.
GS1 barcode validation calculator
Validate the numeric length and GS1 modulo-10 check digit of an entered GTIN while preserving every leading zero.
YOUR RESULT LIVE CALCULATION
GTIN length and checksum check
PASScheck digit
GTIN-13 / EAN-13One less spreadsheet to keep open.
- Entered GTIN
- 6291041500213
- Expected / entered check digit
- 3 / 3
- Zero-padded 14-digit representation
- 06291041500213
- Registration and ownership
- Not checked
Length and arithmetic only. No number is assigned, repaired, or verified against the GS1 registry.
BEHIND THE NUMBER
How the calculation works
This checks a full 8-, 12-, 13-, or 14-digit identifier against the GS1 check-digit arithmetic. Numbers remain text so leading zeros are not discarded. A 14-character zero-padded representation is shown for comparison. The entered check digit is compared with the calculated value; a mismatch is reported rather than silently changing the identifier.
From the rightmost data digit, alternate weights 3 and 1; check digit = (10 - weighted sum modulo 10) modulo 10
When this calculation helps
A check-digit test helps detect certain transcription mistakes in a complete entered GS1 identifier. Preserve leading zeros and select the intended identifier length before validating.
Check the interpretation
A passing checksum does not verify company ownership, allocation, registration, or product identity. Compare the number with the authorized item or logistic-unit record. Do not repair a failed identifier by inventing a new final digit for a real shipment.
A passing length/checksum is not proof of GS1 registration, ownership, product authenticity, barcode image quality, or valid allocation. Do not repair a product identifier solely by replacing its check digit. UPC-E, GS1 application-identifier strings, QR content, GLNs, and SSCCs are outside this GTIN-only tool.
GS1 check-digit calculation methodGood to know
Does this scan a barcode image?
No. Enter the digits printed under the barcode. Image decoding and print-quality verification are separate checks.
Can a valid checksum still belong to the wrong product?
Yes. This is an arithmetic check only. Verify allocation and ownership through the appropriate GS1 service.