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Congratulations! You’ve successfully published a series of books. Now, you want to maximize your revenue by bundling them together into a “box set” or omnibus edition for your readers. This leads to one of the most common questions we receive …
Box Sets & Bundles: The “One vs. Many” ISBN Rule Read More »
If you are new to self-publishing, the acronyms and terminology can feel overwhelming. Three terms, in particular, often get used interchangeably even though they are completely different things: ISBN, Barcode, and Copyright. A common misconception we hear from authors is, …
ISBN vs. Copyright vs. Barcode: What’s the Difference? Read More »
The Problem: You tried to list a product on Amazon, and you saw “Error 8572: You are using UPCs, EANs, ISBNs, ASINs, or JAN codes that do not match the products you are trying to list.” If you are seeing …
How to Fix Amazon Error 8572 (GTIN Mismatch) Without Paying GS1 Read More »
Before your product can go live on Amazon, you need a valid, unique UPC barcode. At UPCs.com, we’ve helped 50,000+ businesses launch on Amazon and retailer stores worldwide with real, verifiable, GS1-origin UPC barcodes that work across major marketplaces. Buy …
If you’re publishing a book in 2025, you may be wondering whether you need an ISBN, a UPC, or both. While they look similar and both create barcodes, ISBNs and UPCs serve very different purposes. This guide breaks it down …
ISBN vs UPC: Which One Do You Need for Your Book? Read More »
Amazon KDP is one of the easiest ways to publish your book, but ISBN requirements can be confusing—especially with Amazon offering a free option. In this 2025 guide, we’ll break down exactly when you need your own ISBN, when you …
Do You Need an ISBN for Amazon KDP? (Ultimate 2025 Guide) Read More »
Publishing a book in 2025? One of the most confusing questions new authors face is: “How many ISBNs do I actually need?” Good news — the answer becomes simple once you understand one key rule: Every format and edition of …
UPC Barcodes & Product Identification · 2025 The 2025 UPC Barcode FAQ for Businesses: How to Buy UPC Codes for Your Products If your business needs UPC barcodes for products sold on Amazon, Walmart, Shopify, retail, or other marketplaces, this …
Selling on Walmart Marketplace can be incredibly rewarding — but if you’ve ever had a product rejected for a UPC issue, you know how frustrating it can be. Walmart is extremely strict about barcode accuracy, and even one small mismatch …
Common UPC Listing Errors on Walmart — and How to Fix Them Read More »
If you’re preparing to launch a product and need a UPC barcode, one of the most common questions is: “Do I need a GS1 barcode, or can I use a third-party barcode service?” This article clears up the confusion by …
Do I Need a GS1 Barcode? When to Use GS1 vs Non-GS1 Read More »