Short answer: Google Shopping feed optimisation means improving the product data you send to Google Merchant Center so your Shopping and Performance Max ads match more searches and win more clicks. The biggest levers are clear titles with the key details first, correct GTINs, detailed product categories, high quality images and price and availability that always match your website. In 2026 good feed data matters even more, because the same data now feeds Google’s AI shopping surfaces too.
In Google Shopping you do not choose keywords. Google reads your product feed and decides which searches each product should show for. That makes the feed the real targeting in any Shopping or Performance Max campaign. Below is the practical feed checklist I work through with online stores, based on Google’s own guidance.
Why the product feed decides your Shopping results
Every Shopping ad is built from your feed: the title, image, price and product details all come from Merchant Center. If a product’s title is vague, Google cannot match it to specific searches. If the price on the ad does not match your website, the product can be disapproved. If the image is weak, people scroll past even when the ad shows.
Bidding and budgets still matter, but they can only work with what the feed gives them. A store with a clean, detailed feed usually gets more relevant traffic from the same budget than a store with a thin one. If you are setting Shopping up from scratch, start with my guide to Google Ads for eCommerce and Shopify stores, then come back to this checklist.
Google Shopping feed optimisation checklist
1. Write titles with the important details first
The title is the most important field in the feed. According to Google’s tips for optimising product data, titles are cut short in most ad formats, so the most relevant information should come first, especially details people cannot see in the image. Google also recommends including attributes such as brand, gender, age group, size and colour.
A simple pattern that works for many stores is: Brand + product type + key attribute (material, size, colour or model). For example, “Acme Men’s Leather Chelsea Boots, Brown, Size 10” tells Google far more than “Classic Boot”. Keep the title consistent with the product page, and do not stuff it with search terms that are not on your site.
2. Add correct GTINs
A GTIN is the barcode number (UPC, EAN or ISBN) that identifies a product. Google asks merchants to provide GTINs whenever they exist, because they help Google understand exactly what you sell and show it in more relevant places. Google reports that retailers who add correct GTINs saw an average 20% increase in clicks. If you make your own products and they have no barcode, use the identifier exists setting correctly rather than inventing numbers.
3. Use detailed product categories and product types
Google recommends using the most detailed product type values you have, at least two or three levels deep, starting broad and ending specific. For example: Footwear > Men’s Boots > Chelsea Boots. This helps Google place the product correctly and makes it easier for you to split campaigns and reports later.
4. Use the best images you have
Google asks for the highest resolution image available and warns against placeholder images or images with promotional text or logos on top. A clean image of the product on a plain background is the safe default. Add extra images through the additional image link field so Google has options for different placements.
5. Keep price and availability in sync
Mismatched prices and stock are one of the most common reasons for disapprovals. Google recommends keeping price and availability current using scheduled feed updates (several times a day where possible), the Merchant API or structured data on your product pages. On Shopify and WooCommerce, a well set up feed app or the official Google integration usually handles this automatically, but it is still worth checking the diagnostics tab every week.
6. Write descriptions that match the page
Google’s advice is to use the same title and description on the feed as on your landing page. Use the description to cover what the title cannot: materials, dimensions, use cases and what makes the product different. Plain, accurate language beats keyword lists.
7. Use custom labels for better campaign control
Custom labels (custom_label_0 to custom_label_4) let you tag products with your own business data, such as margin band, best sellers, seasonal items or clearance stock. They do not change how Google matches searches, but they let you split Shopping or Performance Max campaigns by what actually matters to profit. Margin is the most useful label for most stores, because it lets you set different targets for high and low margin products.
What changed in Merchant Center in 2026
Google’s Merchant Center announcements show a few changes worth knowing this year:
- The annual product data specification update (April 2026) added product-level shipping attributes such as handling cutoff time and minimum order value, so you can set them per product instead of only at account level.
- AI performance insights (announced May 2026) show how products are discovered in AI Mode, AI Overviews and the Gemini app, with guidance on improving product data for those surfaces. Your feed now feeds AI shopping answers, not just ads.
- The “Next” name was dropped (July 2026). Merchant Center Next is now simply Google Merchant Center. Nothing to change on your side.
- Shopping policies were consolidated (September 2026) into one set covering Shopping ads and free listings. Google says this did not add substantive changes, but it is a good moment to re-read them.
Common feed mistakes I see in audits
- Titles that copy the product name only, such as “The Weekender”, with no product type, brand or attributes.
- Missing or wrong GTINs, often because the store owner was not sure what to enter.
- Variants merged into one product, so sizes and colours cannot match specific searches.
- Changing product IDs when a store switches apps. Google advises keeping IDs consistent, because a new ID loses the product’s history.
- Ignoring the diagnostics tab, so disapproved products quietly stop showing.
How to tell if feed changes are working
Change one area at a time, starting with titles on your top sellers, and compare impressions, clicks and conversion value for those products over the next few weeks. In Google Ads, the product level reports for Shopping and Performance Max show which items gained visibility. Make sure purchase values are tracked correctly first; my guide to Google Ads conversion tracking with GA4 and GTM covers the setup. If you run Performance Max, read Performance Max vs Search to see where feed quality fits alongside your other campaigns.
Frequently asked questions
What is Google Shopping feed optimisation?
What is the most important field in a Shopping feed?
Do GTINs really matter for Google Shopping?
Does the product feed affect Performance Max?
Who can optimise my Google Shopping feed?
Need help with Google Shopping?
If your Shopping or Performance Max campaigns are spending but the right products are not showing, I can audit your Merchant Center feed and campaign setup and show you what to fix first. See my Google Shopping management and Google Ads management services, or request a free ads audit.