Your Google Shopping feed is the single most important technical asset in your Google Ads account. It determines which searches your products appear for, how prominently they display, and how much you pay per click. Yet most Shopify stores are running their Shopping campaigns on a default, unoptimised feed – and bleeding money because of it.
What’s in This Article
The difference between a default feed and an optimised feed is staggering. Stores that invest in feed optimisation consistently see 30-50% lower cost per click, 25-40% more impressions, and 2-3x higher ROAS from the same budget. You are literally paying more for less with an unoptimised feed.
The fixes are not complicated. They are specific, systematic improvements to your product titles, descriptions, images, and attributes that help Google match your products to the right searches. Here is the complete optimisation playbook.
Product Titles: The Highest-Impact Optimisation
Your product title is the most important field in your entire feed. Google uses it as the primary signal for determining which searches to show your products for. A title of “Navy Beanie” matches a handful of searches. A title of “Merino Wool Beanie Navy Blue Unisex – Australian Made Winter Hat” matches hundreds more – including long-tail, high-intent searches that convert better and cost less.
The optimal title formula varies by product category, but the principle is always the same: include the most important search terms in a natural, front-loaded order. For apparel: Brand + Gender + Product Type + Attributes (colour, material, size). For electronics: Brand + Product Type + Model + Key Specs. For home goods: Material + Product Type + Style + Dimensions.
Front-load the most important keywords. Google gives more weight to words at the beginning of your title. If “merino wool” is your key differentiator, put it before “beanie,” not after. If your brand name is not widely searched, consider putting the product type first and brand second.
Use the maximum 150 characters. Longer, more descriptive titles match more search queries. But keep it readable – stuffing keywords unnaturally will hurt your quality score. Every word should add a useful descriptor that a real shopper would search for.
Product Descriptions: The Often-Ignored Revenue Lever
Most Shopify stores either leave their feed descriptions empty or copy their website descriptions verbatim. Both are mistakes. Google uses your product description for search matching (though less heavily than titles), and a well-written feed description helps your products appear in more relevant searches.
Write feed descriptions specifically for Google Shopping – they are different from your website descriptions. Include search-relevant keywords naturally: product type, material, use case, target audience, size specifications, and related terms shoppers might search. Keep descriptions between 500-1000 characters.
Do not include promotional language in descriptions. Google explicitly prohibits text like “Free shipping!” or “50% off!” in feed descriptions. Stick to factual product information and keyword-rich descriptors.
Images: Your Silent Salesperson
Your Shopping ad image is the first thing shoppers see, and it determines whether they click. Google requires a clean, professional product image, but “clean and professional” does not mean boring. The best-performing Shopping images stand out in the grid while maintaining product clarity.
Use high-resolution images (minimum 800x800px, ideally 1500x1500px or larger). Google will display your images at various sizes across devices – low-resolution images look blurry in the Shopping carousel, which kills click-through rates.
For your primary image, use a clean product shot on a white or light background. This is what appears in the Shopping grid and needs to clearly show what the product is. For additional images (submitted via the additional_image_link attribute), include lifestyle shots, detail shots, and scale reference images. These appear when shoppers click into your product listing.
Test different image styles. Some categories convert better with on-model photography (apparel), while others perform better with flat-lay product shots (accessories) or in-context lifestyle images (home goods). Run informal A/B tests by changing your primary image for a subset of products and comparing CTR over 2-3 weeks.
Product Attributes: Completeness Equals Performance
Google provides over 30 product attributes you can fill in your feed. The more attributes you complete, the better Google can match your products to relevant searches – and the more data its algorithms have to optimise your ad delivery. Aim for 90%+ attribute completeness.
The high-impact attributes most stores miss include:
- Color. Always specify the exact colour. “Navy Blue” not just “Blue.” Google uses colour for matching fashion and lifestyle searches where colour is a key purchase criterion.
- Material. “100% Merino Wool” or “Organic Cotton” helps Google match material-specific searches. Shoppers who search “merino wool beanie” have high purchase intent – you want to match those searches.
- Size and size_system. Specify the size system (AU, US, UK) and the actual size. This prevents your products from appearing in wrong-size searches and improves the shopping experience.
- Product_type. Use your own category taxonomy that includes relevant search terms. This supplements Google’s product category and gives the algorithm more matching signals.
- Custom labels (0-4). These do not affect search matching but they are essential for campaign structure. Label products by margin tier, bestseller status, seasonality, price range, and performance tier. This lets you bid differently for different product groups.
- Product_highlight. Up to 10 short bullet points highlighting key features. Google may display these in your Shopping listing, making your ad more informative and clickable.
Feed Management Tools for Shopify
The native Google & YouTube Shopify app handles basic feed sync but offers limited optimisation capabilities. For serious feed optimisation, consider these tools:
- DataFeedWatch. The most popular feed management tool for Shopify. Lets you create rules to automatically optimise titles, map categories, and fill attributes. The rule-based system means optimisations apply automatically to new products.
- Simprosys Google Shopping Feed. A Shopify-native app that gives you granular control over every feed attribute without leaving Shopify. More affordable than DataFeedWatch and sufficient for most stores.
- Feedonomics. Enterprise-grade feed management for stores with large catalogues (1000+ SKUs). More expensive but offers the most powerful optimisation and automation features.
- Google Merchant Center supplemental feeds. Free option for manual overrides. Create a spreadsheet with product IDs and the attributes you want to override, upload it as a supplemental feed. Great for title testing and custom label management.
Feed Rules and Supplemental Feeds: Fixing 400 Products Without Touching Shopify
Everything above works beautifully on a catalogue of 40 products. At 400 or 4,000, rewriting titles one product at a time is not a project you will ever finish. This is where most Aussie stores stall, and it is entirely avoidable.
Feed rules let you rewrite attributes in bulk inside Google Merchant Center. Under Products, then Feeds, then Feed Rules, you can concatenate fields, find and replace strings, set defaults for missing values, and map one Shopify field onto a different Google attribute. A single rule that builds your title as Brand plus Product Type plus Title plus Colour plus Size will restructure an entire catalogue in one pass. Crucially, feed rules do not touch your Shopify product data, so your on-site titles stay clean and readable while your feed titles stay keyword-dense.
Supplemental feeds handle the exceptions. A supplemental feed is a second file, usually a Google Sheet, keyed on item ID, that overrides or adds specific attributes for specific products. Use it for the 50 SKUs where the automated rule produces something clumsy, for custom labels you want for bidding, or for promotional attributes during a sale period. Because it is a Sheet, anyone on the team can maintain it without touching the primary feed or your theme.
Custom labels are the most underused field in the whole feed. You get five, they are entirely yours to define, and they are what let you bid differently on different parts of your catalogue. The four that earn their place for most Australian stores:
- custom_label_0: margin band. High, medium, low. Bid harder on the products that actually make money rather than the ones that simply convert.
- custom_label_1: performance tier. Best seller, steady, slow. Lets you push budget toward proven winners and cap spend on the long tail.
- custom_label_2: stock cover. Healthy or low. Pair this with a rule that pulls low-cover items back so you are not paying for clicks on something about to sell out.
- custom_label_3: season or promotion. Useful for Click Frenzy, EOFY and BFCM, when you want a separate bidding treatment for the products in the offer.
Getting these labels right is what turns a Shopping campaign from one undifferentiated bucket into something you can actually steer. It also feeds directly into how you structure the campaigns themselves, which is the other half of this equation.
Two Australian specifics worth setting once and forgetting. First, populate the GTIN field wherever a real barcode exists, because listings with a valid GTIN typically get noticeably wider distribution and eligibility for more surfaces. Where you genuinely make your own product and have no barcode, set identifier_exists to false rather than leaving GTIN blank, which Google reads as an error. Second, submit shipping and tax settings at account level for Australia so your Shopping listings show a delivery price. Listings with visible shipping costs convert better than listings that make the shopper guess, and free-shipping thresholds displayed in the listing lift click-through meaningfully.
The 90-Minute Monthly Feed Audit
Feeds decay. Products get renamed, images get swapped, a supplier changes a colour name and 60 variants quietly stop matching. A monthly audit catches all of it before it costs you a quarter of your impression share.
- Diagnostics first (15 minutes). Merchant Center, Products, Diagnostics. Work the disapprovals top down, then the warnings. Disapproved items earn nothing. Warnings are where most of the recoverable impressions sit, and missing GTIN or missing product attributes are the two that show up most often.
- Zero-impression report (20 minutes). In Google Ads, segment your Shopping report by item ID and filter for products with impressions under 100 for the month. These are almost always title, category or price problems rather than demand problems. Fix the title first, since it drives the match.
- Price competitiveness and price benchmark (15 minutes). Merchant Center reports both. If your price sits more than 15% above the benchmark for a product, you will burn budget on clicks that do not convert. Either fix the price, or push that SKU into a lower bid tier via custom labels.
- Image spot check (15 minutes). Pull 20 random listings and view them at thumbnail size on a phone. If you cannot tell what the product is at 200 pixels, neither can the shopper. Lifestyle images that look great on a product page often fail completely as a Shopping thumbnail.
- Top 20 title review (25 minutes). Your top 20 products by revenue deserve hand-written titles regardless of what the feed rule produces. This is 5% of the work for a disproportionate share of the return.
Track the outcome with three numbers month on month: percentage of catalogue active and serving (aim for 95% or better), impression share for your top 20 products, and average CPC. If active percentage is climbing while CPC falls, the audit is working. If CPC falls but revenue falls with it, you have probably shifted impressions toward cheaper, lower-intent queries, which is a bidding problem rather than a feed problem.
Finally, judge the feed at account level, not campaign level. Shopping and Performance Max both draw from the same feed, so a feed improvement lifts every Google channel at once. Read the result in your blended ROAS rather than in a single campaign’s reported return, or you will end up crediting the platform for revenue the feed earned.
The Compound Effect of Feed Optimisation
Feed optimisation is one of those rare improvements that compounds across your entire Google Ads account. Better titles mean more impressions and higher relevance. Higher relevance means better quality scores. Better quality scores mean lower CPCs. Lower CPCs mean more clicks for the same budget. More clicks with higher relevance mean more conversions. Higher conversions feed Google’s smart bidding algorithms better data, which further improves performance. It is a virtuous cycle that builds on itself.
One eCommerce Circle member optimised their feed using this framework and saw their Shopping ROAS jump from 3.8x to 7.2x within 6 weeks. Their average CPC dropped from $0.52 to $0.34, their impression share increased by 38%, and their click-through rate improved by 22%. Same budget, same products, dramatically different results – all from feed optimisation.
Google Shopping feed work is a core part of the paid media coaching inside eCommerce Circle. We audit member feeds, write the rules, and structure the campaigns that sit on top. If your Shopping numbers are not where they should be, the feed is almost always where the problem starts, so let’s talk.
