GTIN Check Snap

About

GTIN Check Snap gives you fast product and book identifier check-digit checks from the Chrome toolbar.

Use it to validate UPC-A, EAN-8, EAN-13, GTIN-14, ISBN-10, and ISBN-13 values before you paste them into listings, spreadsheets, catalogs, inventory records, or upload templates.

Features:
- Validate full UPC-A / GTIN-12, EAN-8, EAN-13 / GTIN-13, GTIN-14, ISBN-10, and ISBN-13 identifiers.
- Calculate the missing check digit from a supported prefix.
- Clean pasted spaces and hyphens automatically.
- Auto-detect common identifier lengths.
- Copy the completed code or a concise validation note.
- Runs locally with no account, no backend, no network calls, and no requested Chrome permissions.

GTIN Check Snap is an identifier math helper. It does not look up product ownership, product metadata, GS1 licensing, marketplace eligibility, or catalog authority. Always verify official product, publisher, marketplace, and inventory requirements where they apply.