Barcode Checker by SKU.io

Check any UPC, EAN, GTIN or ISBN: right-click a number to validate the check digit, fix dropped zeros and convert formats.

Paste or right-click a product code and see in a second whether it is a real barcode number. What it checks • UPC-A, UPC-E, EAN-8, EAN-13, GTIN-14 and ISBN-10/13, using the GS1 check-digit math. • A leading zero dropped by a spreadsheet, a missing check digit, two digits swapped, and numbers Excel turned into scientific notation. • Store-only numbers (prefix 2 or 04) that Walmart, eBay and most marketplaces will not accept as a product ID. • Case codes: a GTIN-14 on a carton names the single item inside it. What you get • The same number as UPC-A, EAN-13 and GTIN-14, each one click to copy. • A whole list at once: paste a column from your catalog, copy the results as CSV or copy the fixed list. • Plain search links to look the code up on Walmart, eBay, Google Shopping and the GS1 registry. Private by design Nothing you check leaves your browser. The extension asks for one permission, the right-click menu, and cannot read the pages you visit. No account, no ads, no tracking. Made by SKU.io, inventory and order management for brands that sell on several channels.