How to Calculate a Barcode Check Digit (UPC, EAN, GTIN, ISBN)
The GS1 mod-10 formula worked through on real UPC and EAN codes, ISBN-10's mod-11 and its X, and tested check digit func...
The BarcodeReport blog
BarcodeReport Blog
Expert insights on barcode lookup, product identification, and inventory management
What Is a GTIN? GTIN-8, GTIN-12, GTIN-13 and GTIN-14 Explained
GTIN-8, GTIN-12, GTIN-13 and GTIN-14 are one family of numbers. Here's how they nest, how case codes are built, and when...
Barcode Not Found? 11 Reasons a UPC Lookup Comes Up Empty
Most failed barcode lookups have a simple cause: an in-store code, a dropped leading zero, an unexpanded UPC-E, a case c...
Barcode Country Codes: What the First Digits Really Mean
The first digits of a barcode identify the GS1 office that issued the number, not the country where the product was made...
Barcode Types Explained: UPC, EAN, ISBN, Code 128, Code 39 & When to Use Each
A practical guide to the most common barcode types — UPC, EAN, ISBN, Code 128, Code 39, ITF-14 and more — and exactly wh...
Bulk Barcode Lookup: How to Process Thousands of UPCs for Inventory & Product Research
Learn how bulk barcode lookup works, who uses it, and how to process thousands of UPC, EAN, and ISBN codes at once for i...
The Complete Guide to Barcode Lookup: How BarcodeReport.com Helps You Identify Any Product
After 15+ years in the barcode industry, I've seen how proper barcode lookup transforms businesses. This comprehensive g...
Put these guides to work
Look up UPC, EAN and ISBN barcodes from your own code. 100 lookups a month are free, no card required.