A UPC error is one of the most damaging things that can quietly derail your catalog.
UPC codes are the cornerstone of every product sold in the market. In that sense, UPC errors come from common mismatches between packaging and catalog. They eventually led to the removal of Featured Offers and stranded inventory.
And what’s more, UPC errors are pretty silent. The longer a discrepancy is unaddressed, the worse your situation will be. For any seller operating at scale, accurate Amazon UPC codes are the foundation of your catalog.
For all of these cases, Amazon follows a validation process that can be pretty simple if you have followed the general rules that surround UPC codes. In the worst-case scenario, a UPC error can lead to blocked ASINs and stranded inventory. This article will help you avoid this by showing you how to create and update UPC codes for Amazon.
How to Create UPC Codes for Amazon
Every UPC code used on Amazon must be registered through GS1, the global authority for product identification. Amazon cross-references every GTIN submitted against the GS1 database, and codes obtained from third-party resellers will be flagged or rejected, sometimes immediately, sometimes months later.
There are pretty much three main paths you can take to deal with UPC codes:
- Buy a Single GTIN from GS1, common for small sellers: A single GS1 US GTIN costs $30 as a one-time fee with no annual renewal.
- Buy a GS1 Company Prefix, for eligible sellers only: A GS1 Company Prefix ranges from $250 to $10,500 upfront and covers 10 to 100,000 products. Unlike single GTINs, the prefix carries an annual renewal fee. The advantage is that all GTINs under the prefix share the same company identifier across the whole catalog.
- GTIN Exemption from Amazon
For the first two options, the process begins on the official GS1 page.
Step 1: Register with GS1 and choose your plan
Go to gs1us.org and click Get a Barcode. You will be prompted to choose between two options.
A single UPC costs $30 as a one-time fee with no annual renewal. This is the right option if you have a small number of SKUs and don’t plan to scale the catalog quickly.
Whether you buy a single GTIN code or several, you’ll have to provide some basic information about your business and product:
- Company name
- Product description
- Adress
- Contact details
Step 2: Assign a product number to each SKU
Once you have your Company Prefix, you build each GTIN by combining it with a unique product reference number. The combination must be unique per product, which means a different size, color, or bundle configuration requires its own code. If you have a T-shirt in three sizes and two colors, that’s six separate GTINs.
GS1 provides a barcode estimator tool on its website to help you count accurately before you commit.
Step 3: Calculate the check digit
The final digit of every UPC is a check digit, calculated from the preceding numbers. It exists to confirm the code was scanned or entered without errors.
GS1’s Data Hub calculates this automatically for you. If you need to verify a code manually, GS1 provides a check-digit calculator on its website.
Step 4: Generate the barcode image
With the complete 12-digit GTIN confirmed, go to a free barcode generator to finally have the barcode. Download it as a PNG or EPS file. The EPS format is preferable for print, as it scales without quality loss.
Barcode size matters for packaging compliance. GS1 publishes placement and sizing guidelines on its site. Verify these before sending files to your packaging supplier.
How to Upload UPC Codes on Amazon
Once you have your GTIN code, uploading it in Seller Central is simple.
For new listings
Log in to Seller Central and go to Add a Product. Click on Spreadsheet:
Then, click on “Download Blank Template” and click on whichever template fits best to your situation. If you’re uploading brand-new listings, the second option is for you:
After that, you have to configure certain aspects of the document, like all product categories you’ll include and whether the listings will be sold in the Americas or beyond.
Make sure to be precise on the categories you select. You’ll have a lot to choose from, and the more you narrow it down, the better. Many listings suffer from visibility issues because they were originally uploaded to the wrong category.
After you’re done, click on Download Spreadsheet.
Once you’re in, you’ll have to type in all relevant information for every single listing into the Excel document. Required fields are marked in red, conditionals in orange, and optional fields in white.
This is the exact spot where you’ll have to paste the code:
In column D, always select the option Update (instead of PartialUpdate or Delete) when you’re uploading brand-new listings into your catalog. If you don’t, you risk provoking an error you’ll have to fix later.
If you want to learn more about how to edit listings in bulk and how Amazon’s spreadsheets work, make sure to take a look at our blog content.
Related article:
Resolving UPC Issues through Amazon Support
When the Product ID on Amazon does not match the barcode on your physical unit or your GS1 records, you are dealing with a catalog discrepancy.
Directly editing the field is not an option because Amazon locks GS1-sensitive attributes after a listing has been created.
You need to submit a formal catalog correction through Seller Support, backed by verifiable evidence.
How to Open a Case with Seller Support
When the Product ID field on an existing listing is locked, and the GTIN needs to change, a Seller Support case is the only path forward.
Before opening one, check your GS1 Data Hub records and confirm the exact discrepancy you are reporting. Review Amazon seller forums to see how others have handled similar UPC corrections. This gives you a sense of what evidence Amazon typically asks for.
The first objective is to get a human confirmation of why the GTIN is locked and what is required to update it.
From the Seller Central home page, click Get Help and Resources in the top right corner.
Once inside, avoid the predefined help categories. Clicking those options leads you to automatic templates that won’t address a GTIN correction at this level of specificity.
Instead, scroll past the options and click on My issue is not listed.
This forces a manual review. In the text box, explain clearly that the GTIN on the listing does not match your GS1 records and that you need the field unlocked to apply the correct identifier. Attach your GS1 Data Hub screenshot and a photograph of the physical barcode and packaging as supporting documentation.
A few things to keep in mind when writing the case:
- State what is wrong, where it is located, and what you need changed. Avoid general complaints about the listing.
- Expect generic responses at first. It often takes two or three follow-ups to get a specific answer about the GTIN discrepancy.
- Pushing for the exact reason the field is locked is what allows you to fix it correctly. A vague response leads to a vague correction that Amazon will reject.
Amazon has recently added an AI layer to the case creation process. You will often go through a bot conversation before reaching a human, where the system suggests solutions or drafts the case text for you to approve or edit. Work through it to finally reach the human review.
Choosing the Right Communication Channel
Email is generally more reliable for GTIN correction cases. The issue requires documented evidence, and an email thread gives you a clear record of what was submitted and when. Live chat can work for simpler listing issues, but a GTIN dispute involving GS1 verification rarely resolves in a single session.
Some sellers have access to specialist chat during US business hours. These agents carry more authority and a better understanding of catalog-level issues. If that access is available to you, it is the faster route for a case this specific.
Conclusion
An ID code error can go undetected for months before becoming a problem.
The sellers who avoid that cycle are the ones who treat UPC compliance as part of the listing process.
The process described in this article covers every scenario you are likely to encounter, from creating your first GTIN to correcting a locked field through Seller Support.
Frequently Asked Questions About UPC Codes Amazon (FAQs)
What are UPC codes for Amazon?
A UPC (Universal Product Code) is a 12-digit identifier paired with a scannable barcode. On Amazon, it serves as the product’s primary catalog identifier, linking your physical unit to its listing. There are other identifiers like FNSKUs that only Amazon uses, too.
Does Amazon require UPC codes to sell?
In most cases, yes. Amazon requires a valid GTIN to create a new product listing. The only exception is if you have been granted a GTIN exemption for a specific brand and category.
Where to buy UPC codes for Amazon?
Directly from GS1, the global authority for product identification. Amazon verifies every GTIN submitted against the GS1 database.
How to buy UPC codes for Amazon?
Go to the official GS1 webpage and click Get a Barcode. Choose between a single GTIN ($30, no renewal fee) or a GS1 Company Prefix ($250 and up, annual renewal required). Provide your company name, product description, address, and contact details, then complete the purchase.
How many UPC codes do I need for Amazon?
One per unique product variation. A different size, color, scent, or bundle counts as a separate product and requires its own GTIN. GS1 offers a barcode estimator tool on its site to help you calculate before you commit to a plan.
How to create UPC codes for Amazon?
Register with GS1, obtain your GTIN, and generate the barcode image through GS1’s Data Hub or a barcode generator. Download the file as EPS for print or PNG for digital use. Then enter the 12-digit code in the Product ID field of your Amazon listing under the Vital Info tab.
How to generate UPC codes for Amazon?
Once you have a GS1-registered GTIN, use a barcode generator. It calculates the check digit automatically and produces a downloadable barcode image ready for packaging or listing upload.
How to use UPC codes on Amazon?
For new listings, enter the GTIN in the Product ID field of the Vital Info tab and select UPC as the identifier type. For bulk uploads, paste the code into the designated column of the inventory spreadsheet template.
How to get free UPC codes for Amazon?
There are no legitimate free UPC codes. The closest option is a GTIN exemption, which allows approved sellers to list products without a barcode.
Where to get valid UPC codes for Amazon?
GS1 is the only source of codes that Amazon considers valid. A GTIN is valid when it is registered under your company name in the GS1 database and has never been assigned to a different product or brand. You can verify any GTIN at the GS1 Data Hub before using it in a listing.
Your UPC Codes Are Either Working for You or Against You
When your GTINs are properly registered and your listing data matches your GS1 records, suppression flags stop appearing, new SKUs go live without contribution errors, and Brand Registry runs without friction. You stop spending time inside Seller Support cases that should never have been opened. That is the baseline from which real growth becomes possible.
If you are managing unresolved UPC errors, upcoming SKU launches, or a history of listing suppression you have never fully traced to its root cause, this is worth a conversation.
Fill out the form below, and one of our Amazon catalog specialists will review your situation and provide a clear picture of where your catalog stands and what needs to change.
No sales call. A real look at your account from someone who works inside Seller Central every day.