Knowledge Base

Expert guides and resources to help you succeed with your product barcoding journey

Free Tool

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Barcode Guides

Seller Guides

UPC Codes for Amazon FBA Sellers

GTIN requirements, GTIN exemptions, and how third-party codes work on Amazon FBA.

UPC Barcodes for Amazon Sellers

Everything Amazon sellers need to know about product identifiers and listing requirements.

UPC Barcodes for Etsy Sellers

How to add barcodes to Etsy listings and expand to other platforms.

UPC Barcodes for Shopify Stores

Barcodes for Shopify — Google Shopping, Amazon channel, and inventory management.

UPC Codes for Private Label Brands

Building a private label brand? Here is what you need to know about UPC codes.

Platform Requirements

Amazon Barcode Requirements

ASIN, FNSKU, UPC — Amazon barcode requirements explained clearly.

eBay Barcode Requirements

When eBay requires barcodes and how to add them to your listings.

Etsy Barcode Requirements

Etsy barcode policy — optional vs required, and how they help discoverability.

Walmart Barcode Requirements

Walmart Marketplace vs Walmart supplier program barcode rules.

Shopify Barcode Requirements

Barcodes on Shopify for inventory, Google Shopping, and multi-channel sales.

WooCommerce Barcode Requirements

Adding UPC/EAN codes to WooCommerce products and connecting to marketplaces.

Target Barcode Requirements

Target vendor barcode requirements and GS1 compliance for retail suppliers.

Costco Barcode Requirements

Costco supplier barcode standards — what vendors need to know.

Whole Foods Barcode Requirements

Barcode and GTIN requirements for Whole Foods Market suppliers.

Comparisons

UPCBay vs GS1

Side-by-side: pricing, speed, marketplace acceptance, and when to pick each.

Third-Party Barcodes vs GS1 on Amazon

Does Amazon accept third-party barcodes? The full breakdown of Amazon's GTIN policy.

UPC vs EAN

The difference between UPC and EAN codes and which format you need.

Glossary

What Is a UPC Code?

A plain-language explanation of what UPC codes are and how they work.

What Is a GTIN?

Global Trade Item Numbers — the standard behind every product barcode.

What Is an EAN Code?

EAN-13 barcodes explained — the international equivalent of the UPC.

What Is GS1?

The organisation that manages global barcode standards — and what it means for sellers.

What Is an FNSKU?

Amazon's Fulfillment Network SKU — how it differs from a UPC and when you need it.

Best Of

Best Barcode Alternatives to GS1

Honest ranking of the best places to buy UPC codes without a GS1 subscription.

Best UPC Codes for Small Businesses

Which barcode provider is the best fit for small business budgets and needs.

Articles

July 19, 20266 min read

Amazon GTIN Exemption vs. Buying UPC Barcodes: Complete Decision Guide

Should you apply for an Amazon GTIN exemption or buy a UPC barcode? Compare approval times, multi-channel portability, and risks for private label brands.

May 12, 20266 min read

The Complete Barcode Printing & Packaging Guide for E-commerce Brands

Learn how to print scannable UPC and EAN barcodes on product packaging. Covers sizing, DPI, vector SVG placement, color contrast, and quiet zones.

April 6, 20267 min read

How to Fix Amazon GTIN Errors (Error 5665, 8572 & 8556) Explained

Troubleshoot and fix Amazon GTIN errors when creating new product listings. Learn why Error 5665, 8572, or 8556 happen and how to resolve them quickly.

March 15, 20258 min read

The Ultimate Guide to Barcoding Your Products for Amazon FBA

Learn everything you need to know about properly barcoding your products for Amazon FBA success, including requirements, best practices, and common mistakes to avoid.

November 22, 20246 min read

Selling on Multiple Marketplaces? Here's What You Need to Know About UPCs and EANs

A comprehensive guide to managing barcodes across different marketplaces, ensuring compliance, and maximizing your multi-channel selling potential.

August 5, 20235 min read

Avoiding Common Pitfalls When Buying UPC Codes Online

Protect your business by learning how to identify legitimate barcode sellers, understand pricing structures, and avoid common scams in the UPC marketplace.