If you’re selling products online, Google Shopping is an excellent way to connect with potential customers. It enables shoppers to easily compare products, prices, and sellers in one place. However, for your products to stand out and perform well they must be accurately categorized and easily discoverable, and that’s where Google Shopping GTIN (Global Trade Item Numbers) come into play.
GTINs are unique product identifiers, such as UPC, EAN, or ISBN codes, that help Google understand exactly what you’re offering. By including GTINs in your product listings, Google can more accurately match your products with customer searches, enhancing your visibility and improving ad performance.
Whether you’re a small business or a large retailer, grasping the importance of GTINs can significantly impact how well your products rank and, ultimately, how many sales you achieve.
In this guide, we’ll explore why GTINs are crucial for Google Shopping, how they affect your listings, and how to use them effectively to maximize your success.
Key Takeaways:
- Including GTINs in your product listings helps Google accurately categorize and match your products with relevant searches, increasing visibility and sales potential.
- GTINs ensure that your products are correctly displayed in Google Shopping comparisons, allowing customers to find and compare them alongside other sellers.
- Listings with GTINs tend to perform better in Google Ads, leading to improved click-through rates (CTR), lower cost-per-click (CPC), and higher conversion rates—ultimately driving more sales.
GTIN (Global Trade Item Number) is a unique identifier used worldwide to distinguish products in retail and e-commerce. It helps businesses, marketplaces, and search engines like Google Shopping accurately identify and categorize products, ensuring customers find precisely what they’re looking for.

Think of a GTIN as a digital fingerprint for your product. Each one is unique and assigned to a specific item. Whether you’re selling electronics, books, apparel, or grocery items, GTINs ensure your product is recognized correctly across various online platforms.
GTINs come in different formats depending on the type of product and its region. Here are the most common ones:
- UPC (Universal Product Code): Used mainly in North America, typically a 12-digit barcode found on most retail products.
- EAN (European Article Number): Commonly used in Europe, an 8- or 13-digit code that functions similarly to a UPC.
- ISBN (International Standard Book Number): A 10 or 13-digit number exclusively assigned to books.

- JAN (Japanese Article Number): A version of EAN used in Japan, typically 8 or 13 digits long.
- ITF-14 (Interleaved Two of Five): A 14-digit barcode often used for carton or bulk packaging of products rather than individual retail sales.

Simply put, GTINs help Google accurately identify, categorize, and display your products, ensuring they appear in the right search results and reach the right customers. Without a GTIN, Google may struggle to match your product with others in its database, potentially lowering its ranking or even disapproving your listing.
Google processes millions of product listings from different sellers worldwide. When a product has a GTIN, Google can:
- Group identical products together: If multiple sellers offer the same product, Google can accurately compare listings based on price, shipping, and availability.
- Improve product matching accuracy: GTINs help Google connect the product with its official data, ensuring customers see the correct details, images, and descriptions.
- Standardize product listings: With a GTIN, sellers don’t need to enter excessive manual product data. Google already knows key details like brand, category, and specifications.
For example, If you’re selling a LEGO Star Wars set, the GTIN ensures that Google correctly identifies it as a specific model rather than grouping it with generic LEGO toys. This helps customers find the exact product they want.
Now, let’s look at why Google enforces this rule and how it impacts your product visibility and sales.
Google’s Guidelines on GTINs for Product Listings
Google has specific guidelines for GTINs, especially for branded products sold by multiple retailers. According to Google Merchant Center’s policies:
- GTINs are mandatory for most new, brand-name products sold by multiple sellers.
- If a manufacturer assigns a GTIN, you must include it in your product listing.
- If you sell custom, handmade, or private-label products, GTINs are not required.
For example, If you’re selling an Apple iPhone 14, Google expects you to provide the GTIN that Apple assigned so your listing shows up correctly in Google Shopping searches. On the other hand, if you’re selling handmade wooden phone cases under your brand, Google won’t ask for a GTIN.

Including a GTIN in your product listing isn’t merely about following Google’s regulations. It can be a pivotal factor in enhancing visibility, competitiveness, and sales results. Let’s take a closer look at how GTINs influence your Google Shopping rankings and the performance of your ads.
1. Higher Rankings in Google Shopping
Google Shopping operates like its search engine. Products that meet its requirements and provide highly structured, accurate data are ranked higher. GTINs play a key role in this process because they:
- Help Google correctly identify products from multiple sellers.
- Ensure accurate product details, images, and descriptions are used.
- Improve relevancy in search results, making it easier for shoppers to find your product.
2. More Competitive Listings in Product Comparisons
When multiple sellers offer the same product, Google Shopping automatically groups them for easy comparison. This means:
- Your product appears in direct price, shipping, and seller comparisons.
- Customers can see your offer alongside competitors, increasing the chances of a sale.
- Without a GTIN, your product may be excluded from these comparisons, losing potential customers.
3. Lower Advertising Costs (CPC) in Google Ads
One of the biggest benefits of GTINs is their ability to lower advertising costs in Google Shopping Ads by improving product match accuracy. Here’s how:
- Google prefers listings with GTINs because they allow for better product identification.
- GTIN-enabled products require less manual intervention from Google’s algorithm, lowering the Cost-Per-Click (CPC) for advertisers.
- Your ad spending becomes more efficient as you get better exposure for less cost.
4. Better Customer Trust & Higher Conversion Rates
Shoppers rely on accurate, detailed product listings when making a purchase. A missing or incorrect GTIN can create confusion and reduce trust. With a GTIN, Google:
- Displays accurate product details, including specs, images, and descriptions.
- Reduces listing errors, ensuring customers get the product they expect.
- Increases conversion rates as customers feel confident in their purchase decisions.
Adding a GTIN (Global Trade Item Number) to your product listings is essential for ensuring accurate product identification and improving your visibility on Google Shopping. But where do you find these numbers, and how do you add them to your product feed? Let’s break it down step by step.
1. Checking Product Packaging for GTINs
The easiest way to find a GTIN is by looking at the product packaging. Most branded products already have a GTIN printed as a barcode. Here’s where you can check:
- Retail Products: Look for the barcode on the back or bottom of the packaging.
- Books: The ISBN (which is a type of GTIN) is usually printed on the back cover.
- Electronics: GTIN is listed on the box or product label along with the serial number.
- Grocery & Household Items: Check the nutritional information or product details section.

2. Using Manufacturer-Provided GTINs
If you’re selling brand-name products, the manufacturer assigns a GTIN to each item. You can often find this information in:
- Product catalogs provided by the manufacturer.
- Invoices or packing slips from your supplier.
- Official websites of the brand.
Pro Tip: Always double-check the GTIN with the manufacturer to avoid errors or duplicate numbers.
3. Buying GTINs from Official Sources (GS1)
If you’re selling private-label, handmade, or custom products, you may need to purchase your own GTINs. The official source for GTINs is GS1, the global organization responsible for issuing these numbers.
You can visit GS1’s website and register your business. Choose a single GTIN or a bulk set based on how many products you have. GS1 will then assign unique GTINs for your products.
Note: Avoid purchasing GTINs from third-party resellers that lack GS1 certification, as Google may flag them as invalid.
4. Adding GTINs to Your Google Merchant Center Feed
Once you have the correct GTINs, add them to your product listings in Google Merchant Center. A dedicated plugin like WebToffee’s WooCommerce Product Feed plugin can help create accurate and well-optimized product feeds with all information like GTINs.
Here’s how it specifically helps with GTINs:
- Automated GTIN Mapping: The plugin pulls GTINs directly from your product data, ensuring they are included in your feed without manual entry.
- Customizable Feed Fields: If you need to add GTINs manually or modify existing ones, you can easily do so within the plugin.
- Bulk Feed Management: Ideal for large stores, allowing you to manage GTINs across hundreds or thousands of products efficiently.
- Multi-Channel Compatibility: Supports multiple feed formats, allowing you to list products on Google Shopping, Facebook, and other marketplaces with GTINs.

As we’ve seen, Google Shopping GTINs are more than just product identifiers. They play a crucial role in boosting visibility, improving rankings, and increasing conversions in Google Shopping.
Selling brand-name products? Ensure your listings have the correct GTINs to prevent disapprovals or reduced visibility. For private-label or custom products, purchasing GTINs from GS1 helps maintain compliance.
Managing a large inventory? A WooCommerce Product Feed Plugin like WebToffee’s can automate the process, keeping your feeds optimized and error-free.
By taking these steps today, you’ll set yourself up for better rankings, increased conversions, and long-term success in Google Shopping.