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Understanding UPCs (Universal Product Codes)

Understanding and entering different UPC codes in your system.

Written by Michael Cook

Updated at July 4th, 2025

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What is a UPC?

  • A UPC (Universal Product Code) is the barcode scanned at checkout.
  • It tells the system what the product is and who made it.

How a UPC Is Built

  • Most UPCs have 12 digits.
  • The last digit is a check digit—used to catch barcode errors.
  • It’s split into two parts so scanners can read it either way.

Two Main UPC Types You Might See

  • UPC-A (12 digits) – The standard version used on most products.
  • UPC-E (8 digits) – A shorter version used on small items (like gum or candy).

What to Watch For in XSite

If you’re seeing barcode issues:

  • Some products may show up with 8 digits (UPC-E) and others with 12 digits (UPC-A).
  • Use the search bar in XSite to find the item by UPC.
  • If XSite shows an 11-digit UPC, that usually means the last digit is missing.

What to Do

  • Check the physical product: Compare the barcode on the item to the one in XSite.
  • Go to the item in XSite: On the item’s page, click “Inventory” to see if it’s been selling.
  • If there are no sales and the UPC is wrong, you can either:
    • Fix the barcode to match the actual product.
    • Delete the bad UPC if it’s not being used.
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