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GTIN Check Digit Guide — EAN-8, UPC-A, EAN-13

How to compute and validate GS1 check digits for EAN-8, UPC-A, EAN-13, and GTIN-14 using Tools.Town — without claiming free company prefixes.

14 October 2026 5 min read By Tools.Town Team Fact Checked

Aa Bb Cc
camelCase
snake_case
PascalCase

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Key Takeaways

Complete — paste body digits without check (e.g. 12 digits for EAN-13).
Validate — paste the full code including check.
Auto — prefers validate for full retail lengths; use Complete for a 12-digit EAN-13 body.

Then encode or print via Barcode Generator / Label Sheet as needed.

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Complete vs Validate?

Complete adds a check digit to a body (7/11/12/13 digits). Validate checks a full code (8/12/13/14).

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