Google Shopping Ads show your product image, title, price, and store name directly in search results. For e-commerce businesses, they consistently outperform standard text ads — with higher click-through rates and lower cost per acquisition. If you sell products online and are not running Shopping Ads, you are leaving revenue on the table.
How Shopping Ads Work
Unlike Search Ads where you bid on keywords, Shopping Ads are driven by your product data feed. Google matches your product information — title, description, category, price, image — to relevant search queries automatically. You do not choose keywords; instead, you optimise your product data to appear for the right searches.
Setting Up Google Merchant Center
Google Merchant Center is where your product data lives. Setup steps: create a Merchant Center account and verify your website. Connect it to your Google Ads account. Submit your product feed — either manually (CSV/XML upload), via API, or through a plugin (WooCommerce has built-in integration). Ensure your feed meets Google’s requirements: accurate prices matching your website, correct availability, compliant images, and proper categorisation.
Optimising Your Product Feed
Titles: The most important field. Include key attributes: brand, product type, size, colour, and distinguishing features. “MAD Optimizer WordPress Performance Plugin — Speed Optimisation & Caching” outperforms “MAD Optimizer.” Front-load the most important keywords — titles may be truncated on mobile.
Descriptions: Include relevant keywords naturally. Describe features, benefits, and use cases. Google uses this for query matching even though it is not always shown in the ad.
Images: Use high-quality product images on a white background. Show the product clearly. Follow Google’s image requirements — minimum 100×100 pixels (250×250 for apparel). Include lifestyle images as additional images.
Categories: Use Google’s product taxonomy to categorise accurately. Specific categories perform better than generic ones. “Software > Computer Software > Business Software” is more precise than just “Software.”
Campaign Structure
Organise your Shopping campaigns by product category or margin level. High-margin products can afford higher bids. Create separate campaigns for your best-sellers so they get dedicated budget. Use product groups within campaigns to set different bids for different product types.
Bidding Strategies
Manual CPC: Full control over bids per product group. Good for starting out and understanding performance before automating. Enhanced CPC: Google adjusts your manual bids up or down based on conversion likelihood. A good middle ground. Target ROAS: Google automatically sets bids to achieve your target return on ad spend. Requires 15+ conversions in the last 30 days to work effectively. Maximise Conversion Value: Google maximises total revenue within your budget. Best for campaigns with sufficient conversion data.
Negative Keywords for Shopping
While you do not target keywords in Shopping, you can add negative keywords to prevent your ads from showing for irrelevant searches. Review your search terms report regularly. Common negatives for e-commerce: “free,” “download,” “review” (unless you want review traffic), competitor brand names, and irrelevant product variations.
Performance Max for Shopping
Performance Max campaigns use AI to run your Shopping Ads across all Google surfaces — Search, Display, YouTube, Gmail, Maps, and Discover. They often outperform standard Shopping campaigns but offer less control and visibility. Run both standard Shopping and Performance Max to compare, and use asset groups in Performance Max to maintain some control over targeting and creative.
Measuring Shopping Ad Performance
Key metrics: ROAS (target 3-4x minimum), conversion rate per product, impression share (are you showing for enough searches?), click share, and product-level performance. Analyse performance at the product level — some products will be highly profitable while others may not cover their ad costs. Adjust bids and budgets based on individual product profitability.
