Validate GTIN numbers before printing barcodes
Validate common GTIN lengths with the standard modulo 10 check digit rule.
GTIN validator
ValidateGTIN validation
Valid13 digits enteredWhen to validate a GTIN
GTIN validation is a math check, not a registry lookup. It is still useful because a failed check digit almost always means the number was copied, typed or padded incorrectly.
Validate before the label exists
GTIN checks are cheaper before a designer places the barcode.
- Paste the full value from the item record.
- Fix length or check digit errors before creating artwork.
- Confirm official assignment outside the validator.
This is a format check, not a registry search.
Validate a GTIN number
- Enter the full GTIN-8, GTIN-12, GTIN-13 or GTIN-14 value.
- Let the validator check the final digit against the standard modulo 10 rule.
- Compare the result with the number in your product, carton or catalog record.
- If it fails, check for missing leading zeros, copied digits or the wrong GTIN length.
- Validate again before generating barcode artwork or sending the number to a printer.
Where GTIN validation helps
- GTIN-12 UPC values
- GTIN-13 EAN values
- GTIN-14 carton codes
GTIN checks before use
- GTIN validation is a math check, not a registry lookup.
- Leading zeros matter. Do not let spreadsheets remove them from GTIN-12 or GTIN-14 values.
- Use format-specific generators after the GTIN passes validation.
GTIN validation mistakes to avoid
- Using GTIN validation as a registry or ownership lookup.
- Changing the GTIN length by losing leading zeros.
- Validating a case-level GTIN and then printing it on an individual retail item.
GTIN validator questions
Which GTIN lengths can I validate?
You can validate GTIN-8, GTIN-12, GTIN-13 and GTIN-14 values.
Does GTIN validation prove ownership?
No. It only checks the number's final digit. Ownership and assignment must be confirmed through your official records or issuer.
Why did my GTIN fail?
Common causes include a mistyped digit, missing leading zero, wrong length or a number copied from the wrong product level.
Can this validator look up the product name?
No. It checks the GTIN math rule only. It does not connect to a product registry or prove that the number belongs to a specific product.
What is the difference between GTIN-12 and GTIN-13?
GTIN-12 is the 12-digit format behind UPC-A, used mainly in North America. GTIN-13 is the 13-digit format behind EAN-13, used internationally. You can convert GTIN-12 to GTIN-13 by adding a leading zero.
Does validation tell me if the GTIN is registered with GS1?
No. Validation only checks the math. To confirm that a GTIN is officially registered and belongs to a specific company, use the GS1 Verified by GS1 service or check your own GS1 account records.
Can I use the validator to check a GTIN before listing a product online?
Yes, it is a good first step. A failed check digit means the number has a typo or formatting error. But passing validation does not guarantee the marketplace will accept it. Platforms like Amazon also verify ownership through the GS1 database.
More tools for product identifiers
Barcode Check Digit Calculator
Calculate or validate the last digit used by many retail barcode numbers.
EAN-13 Barcode Generator
Generate EAN-13 barcode artwork for retail products, with check digit validation built in.
UPC-A Barcode Generator
Generate UPC-A barcode artwork for US and Canadian retail product labels.
ITF-14 Barcode Generator
Generate ITF-14 barcodes for outer cartons, master cases and warehouse labels.