How to Generate Bulk Barcodes for Amazon FBA and Shopify Inventory

Managing a growing e-commerce catalog can quickly turn barcode creation into a repetitive task. A business with dozens or hundreds of products may need barcode artwork for different SKUs, product variations, packages, or internal inventory records.

Creating each barcode individually can be slow and increases the possibility of assigning the wrong barcode to the wrong product. A structured bulk-barcode workflow can make the process faster, more organized, and easier to manage.

For sellers using platforms such as Amazon and Shopify, the goal should not simply be to generate a large number of barcode images. The more important objective is to create a reliable system in which every product, variant, SKU, and barcode is correctly connected.

Start With an Organized Product List

Before generating any barcodes, create a master spreadsheet containing all of your products.

Useful columns can include:

• Product name
• SKU
• Product variation
• GTIN or barcode number
• Barcode format
• Quantity
• Label size
• Marketplace
• Barcode file name
• Storage location

This information gives you a single reference point when creating and printing labels.

SKUs and barcodes serve different purposes. Shopify describes SKUs as internal codes that businesses can create for inventory tracking, while barcodes are used for product identification and scanning. Keeping these fields organized separately can make inventory management much easier. Shopify Help Center

For example, a business selling T-shirts might have separate SKUs for different sizes and colors. Each variant should be clearly identified before barcode generation begins.

Understand Amazon FBA Barcode Requirements

Amazon FBA requires products to be properly identified and labeled before they reach fulfillment centers.

Amazon's current guidance explains that manufacturer barcodes can include UPC, EAN, JAN, or ISBN. Certain products may instead require Amazon barcodes, including FNSKU labels, depending on the product and seller situation. Sell on Amazon

This means sellers should determine which barcode method applies to each product before generating a large batch.

Don't assume that every product in an Amazon catalog can use exactly the same barcode approach. Product category, condition, eligibility, brand status, and Amazon's requirements can affect which identification method is appropriate.

Amazon also uses product IDs such as UPC, EAN, and ISBN to identify products and connect them with product listings. Sell on Amazon

Understand the Difference Between a Barcode and a GTIN

One of the most important things to understand before creating bulk barcodes is that the barcode image and the product identifier are not the same thing.

A GTIN is the product identifier. The barcode is the machine-readable representation of that identifier.

GS1 explains that GTIN-12 is commonly known as UPC, while GTIN-13 is commonly known as EAN. These identifiers are used to uniquely distinguish products within the GS1 system. GS1 GO Customer Service Portal

A barcode generator creates the visual symbol from an existing number. It does not automatically provide a legitimate GS1 product identifier.

For products that require GS1 identification, businesses should obtain their identifiers through the appropriate GS1 organization rather than simply inventing numbers or purchasing questionable numbers from unauthorized sources. GS1 states that only a GS1 Member Organisation can provide GS1 GTINs and guarantee their uniqueness within the GS1 system. GS1 GO Customer Service Portal

Prepare Your Barcode Numbers

Once your product information and identifiers are confirmed, prepare the numbers in a consistent format.

For example:

The important part is maintaining a clear relationship between the product record and its barcode.

If a barcode is accidentally assigned to another product, the problem can spread into inventory, fulfillment, and marketplace records.

Generate the Barcodes

After your spreadsheet has been checked, you can generate the actual barcode artwork.

A barcode generator can turn the appropriate product number into a scannable barcode graphic.

For a large catalog, organize the generated files using SKU-based filenames.

For example:

SKU12345-barcode.png

SKU12346-barcode.png

SKU12347-barcode.png

This simple naming convention makes it easier to locate the correct artwork when preparing labels.

If you're managing hundreds of products, consistent filenames can save considerable time and reduce the chance of selecting the wrong barcode during label production.

Keep Amazon and Shopify Data Consistent

If your business sells through both Amazon and Shopify, consistency becomes especially important.

Your product title, SKU, variant information, barcode number, and inventory records should correspond correctly across your systems.

Shopify allows merchants to add barcodes to products and variants and supports barcode-based product identification in its inventory workflows. Shopify also allows barcode information to be added through its bulk editor or CSV import tools. Shopify Help Center

This makes it possible to manage a large catalog more efficiently without entering every product manually.

A mismatch between your product database and barcode records, however, can create significant inventory problems.

For example, if a barcode intended for a large black jacket is assigned to a medium blue jacket, scanning that barcode could lead employees or systems to identify the wrong product.

Give Every Variant the Correct Identifier

Product variations deserve special attention.

Consider a product sold in:

• Small, medium, and large
• Black, white, and blue
• Single-pack and three-pack versions

These may need separate product identification depending on the applicable standards and marketplace requirements.

Shopify specifically notes that unique barcodes can be assigned to products and variants for identification and scanning. Shopify Help Center

Before generating your batch, review your catalog and make sure each variation is clearly defined.

Test Before Printing Hundreds of Labels

Never assume that a bulk-generated batch is automatically perfect.

Print a small sample before committing to hundreds or thousands of labels.

Check that:

1. The correct product appears when scanned.
2. The barcode scans consistently.
3. The printed dimensions are appropriate.
4. The barcode hasn't been distorted.
5. The human-readable number matches your records.
6. The label remains readable after printing.

Shopify recommends testing barcode prints before producing a large batch and provides guidance on resolution, sizing, contrast, and placement. Shopify Help Center

Amazon likewise provides specifications for printing and applying FBA barcode labels, including recommended label dimensions and black printing on non-reflective material. Sell on Amazon

Pay Attention to Printing Quality

Generating the correct barcode is only the first part of the process.

A barcode can fail to scan if it is printed too small, distorted, cut off, placed on an unsuitable surface, or surrounded by interfering graphics.

Shopify recommends using appropriate resolution and testing labels before printing large quantities. It also advises keeping barcodes flat, avoiding folds and edges, and ensuring that surrounding elements don't interfere with scanning. Shopify Help Center

For e-commerce businesses, a small amount of testing can prevent a large batch of unusable labels.

Create a Repeatable Workflow

Once the first batch has been completed, turn the process into a repeatable system.

A practical workflow might look like this:

Product database → Verify identifiers → Confirm marketplace requirements → Generate barcodes → Name files by SKU → Test samples → Print labels → Apply labels → Scan into inventory

When a new product is added, follow the same process instead of creating a completely new method.

This consistency becomes increasingly valuable as an e-commerce catalog grows.

Keep a Barcode Master File

It is also useful to maintain a master barcode spreadsheet.

Record:

• Product name
• SKU
• Barcode number
• Barcode type
• Marketplace
• File name
• Date created
• Product status

This gives your team a reference point when products are updated, discontinued, or expanded with new variants.

It can also help prevent accidental reuse of a barcode for an unrelated product.

Use Barcodes as Part of a Larger Inventory System

Barcodes become much more valuable when they are connected to an inventory workflow.

For example, a business might scan products when they arrive, scan them into storage, scan them during order picking, and scan them again during packing.

Shopify's inventory tools support barcode scanning for identifying products and adjusting inventory quantities, demonstrating how barcode data can become part of everyday inventory operations rather than simply appearing on product packaging. Shopify Help Center

Final Thoughts

Bulk barcode generation doesn't have to be complicated. The most important part is organization.

Start with accurate product information, create clear SKU and barcode records, verify the requirements for Amazon or Shopify, and make sure the appropriate product identifiers are being used.

Once those details are confirmed, a tool such as the QRCodePulse barcode generator can help turn product numbers into practical barcode artwork for labels and inventory workflows.

Most importantly, test a small batch before printing hundreds of labels. A structured process can save time, reduce labeling mistakes, and make barcode management much easier as an e-commerce business continues to grow.