Google Shopping Ads Optimisation: Feed, Bidding and Campaign Strategies That Work
Table of Contents
Why Shopping Ads Optimisation Matters
Shopping ads optimisation is the process of systematically improving every element of your Google Shopping campaigns to increase visibility, click-through rates, conversion rates, and return on ad spend. Shopping ads account for the majority of Google’s e-commerce ad clicks, appearing prominently at the top of search results with product images, prices, and store names. Yet many advertisers set up Shopping campaigns and leave them to run without ongoing optimisation, which means they leave significant revenue and efficiency gains on the table.
The opportunity cost of unoptimised Shopping campaigns is substantial. A poorly optimised product feed reduces the number of queries your ads appear for. Incorrect campaign structures prevent you from allocating budget effectively across products. Suboptimal bidding wastes spend on low-value clicks while underbidding on high-value opportunities. Each of these issues is fixable, and the compound effect of fixing all of them typically improves shopping ads optimisation results by 30-60 per cent.
Google Shopping operates differently from text search campaigns. You cannot choose specific keywords to bid on — Google matches your products to search queries based on your product feed data. This means your feed is your targeting mechanism. Optimising your feed is not just a technical task; it is the most important strategic activity in Shopping campaign management. The quality of your feed data determines which searches trigger your ads, how relevant your ads appear, and ultimately how much revenue your campaigns generate.
Product Feed Optimisation
Product titles are the single most impactful element in your feed. Google uses titles to match products to search queries, so keyword-rich, descriptive titles directly expand the range of searches your ads appear for. Follow this structure: Brand + Product Type + Key Attributes (material, size, colour) + Distinguishing Feature. For example, “Samsung Galaxy S24 Ultra 256GB Titanium Grey Smartphone” is far more effective than “Samsung S24.”
Product descriptions provide additional context for matching. Include relevant keywords, product specifications, use cases, and benefits. While descriptions have less weight than titles in query matching, they contribute to relevance scoring and help Google understand your product’s full context. Write natural, informative descriptions that serve both Google’s algorithm and shoppers who read them on your product page.
Product images must meet Google’s quality requirements: minimum 100×100 pixels (250×250 for apparel), white background preferred, no watermarks or promotional text, and the product must fill at least 75 per cent of the frame. Beyond meeting minimum requirements, invest in high-quality professional photography. Shopping ads are visual — a clear, attractive product image dramatically outperforms a dark, blurry, or cluttered one. Use supplemental image feeds to add lifestyle images, alternate angles, and detail shots. Ensure all required and recommended attributes are populated in your feed: GTIN, brand, condition, availability, price, and product category. Missing attributes reduce your eligibility for search queries and can trigger Google Shopping disapprovals.
Campaign Structure Strategies
The right campaign structure gives you granular control over bids, budgets, and performance analysis. The most effective approach segments products into separate campaigns or ad groups based on criteria that align with your business priorities: profit margin, product category, brand, price point, or performance tier.
A tiered structure is particularly effective. Create three Shopping campaigns with different priorities: high priority for your best products (bestsellers, highest margin, or promotional items), medium priority as your standard campaign covering most products, and low priority as a catch-all for remaining inventory. Use negative keywords at the campaign level to funnel specific query types to the appropriate campaign tier — for example, directing brand-name queries to the high-priority campaign.
Use custom labels in your product feed to tag products with business-specific attributes that are not part of Google’s standard product taxonomy. Common custom labels include margin tier (high, medium, low), seasonality (Christmas, Chinese New Year, evergreen), bestseller status, clearance status, and new arrival flag. These labels let you create campaign segments and bidding rules based on your business logic rather than just product categories. Update custom labels regularly to reflect current business conditions and promotional calendars.
Bidding Strategies for Shopping Campaigns
Bidding strategy choice depends on your conversion data volume and optimisation goals. Target ROAS is the preferred automated bidding strategy for Shopping campaigns with sufficient data (at least 15 conversions in the last 30 days). It adjusts bids in real time based on the predicted conversion value of each auction, allowing you to maintain profitability across thousands of products and search queries simultaneously.
Set ROAS targets based on your product margins. A product with a 50 per cent gross margin and a 20 per cent profit target requires an 833 per cent ROAS target (spend no more than 30 per cent of revenue on ads). Different campaigns can have different ROAS targets based on the products they contain. Start conservative (higher ROAS target) and lower gradually while monitoring conversion volume — too aggressive a ROAS target limits reach, while too low a target erodes margins.
Manual CPC bidding gives you direct control and is appropriate for campaigns with limited conversion data or for testing new products. Set initial bids based on expected CPC for your product category and adjust weekly based on performance. Use bid adjustments for device (mobile versus desktop), time of day, and location to refine manual bids further. Many advertisers use a hybrid approach: automated bidding for established, data-rich campaigns and manual bidding for new or experimental campaigns. Pair your Shopping bidding strategy with a comprehensive Google Ads approach that includes search campaigns for queries where Shopping ads have limited presence.
Negative Keywords for Shopping Campaigns
Negative keywords in Shopping campaigns serve the same purpose as in search campaigns: preventing your ads from showing for irrelevant queries. However, because Shopping campaigns do not use keyword targeting, negative keywords are your only tool for controlling which search terms trigger your products. This makes them critically important for Shopping campaign efficiency.
Review your search terms report weekly and add negative keywords for queries that are clearly irrelevant to your products. Common categories of negative keywords include: DIY and repair terms (if you sell finished products, not parts), competitor brand names (unless you intentionally target them), job-related terms (“salary,” “career,” “hiring”), and informational queries (“how to,” “what is,” “review”) that indicate research rather than purchase intent.
Use negative keywords strategically across your tiered campaign structure to route search queries to the appropriate campaign. In a two-tier structure, add broad generic terms as negatives in the high-priority campaign so they flow to the standard campaign, while the high-priority campaign captures more specific, higher-intent queries. This ensures your highest bids are applied to the most commercial search terms. Maintain a shared negative keyword list at the account level for universally irrelevant terms, and campaign-level lists for structural query routing.
Performance Analysis and Reporting
Analyse Shopping campaign performance at multiple levels: campaign, ad group, product group, and individual product. The product-level view is especially important because Shopping campaigns can contain hundreds or thousands of products, and performance varies dramatically. Identify your top 20 per cent of products by revenue — these typically generate 80 per cent of your returns — and ensure they have maximum visibility and competitive bids.
Track key metrics weekly: impressions, clicks, CTR, average CPC, conversions, conversion rate, revenue, ROAS, and impression share. Compare these metrics period over period to identify trends. Sudden drops in impressions may indicate feed issues or new competition. Declining CTR may signal that competitors are improving their listings or offering lower prices. Falling conversion rates may point to website issues or market shifts.
Use Google Ads’ Auction Insights report to understand your competitive position. Impression share tells you what percentage of eligible impressions you captured. Overlap rate shows how often competitors appear alongside you. Outranking share reveals how often your ads ranked above specific competitors. Track these competitive metrics monthly and use them to inform bidding and budget decisions. Build a monthly reporting dashboard that combines Shopping performance data with broader e-commerce marketing metrics to evaluate Shopping’s contribution to overall business performance.
Advanced Optimisation Techniques
Supplemental feeds add data to your primary product feed without modifying it directly. Use supplemental feeds to add custom labels, override titles for specific products, add promotional text, or include seasonal attributes. This approach is particularly useful when your primary feed is auto-generated from your e-commerce platform and difficult to modify at the product level.
Promotional annotations increase Shopping ad visibility and click-through rates. Link your Google Merchant Center promotions to display special offers directly in your Shopping ads — “Free Shipping,” “10% Off,” or “Buy 2 Get 1 Free.” Products with promotional annotations consistently outperform those without, as the promotion badge catches the eye and communicates immediate value.
Feed rules in Merchant Center let you transform and enrich your product data automatically. Use rules to prepend brand names to titles, append size or colour information, standardise product type categorisation, and map your internal categories to Google’s product taxonomy. Local inventory ads, if you have physical stores in Singapore, display in-stock availability and drive foot traffic for shoppers searching nearby. Product ratings (aggregated from third-party review sites) and seller ratings add credibility to your Shopping ads and improve click-through rates. Each of these advanced techniques contributes incremental improvement, and their compound effect can transform campaign performance significantly.
Frequently Asked Questions
How often should I optimise my Shopping campaigns?
Review search terms and add negatives weekly. Adjust bids weekly or fortnightly. Optimise product feed titles and descriptions monthly. Conduct structural reviews (campaign architecture, product grouping, custom labels) quarterly. Feed accuracy checks (pricing, availability, images) should be automated and monitored daily through Merchant Center diagnostics.
What is the most important factor in Shopping ad performance?
Product feed quality, particularly product titles. Titles determine which search queries trigger your ads, making them the most impactful lever for both reach and relevance. A well-optimised title can increase impressions by 50-100 per cent compared to a basic title. Invest more time in title optimisation than any other single activity.
Why are my Shopping ads not showing for relevant searches?
Common causes include: product titles missing relevant keywords, bids set too low for competitive queries, budget exhaustion early in the day, product feed errors causing disapprovals, or product data missing required attributes. Check Merchant Center for feed diagnostics, review impression share data to identify budget or bid limitations, and optimise product titles to include the terms you want to trigger for.
Should I use Performance Max instead of standard Shopping?
Standard Shopping gives you more control and visibility, while Performance Max can find incremental conversions across Google’s inventory. For most e-commerce businesses, running both is optimal. Use standard Shopping as your primary campaign with full control, and Performance Max to capture additional demand. Monitor Performance Max carefully as its reporting is less transparent than standard Shopping.
How do I handle seasonal products in Shopping campaigns?
Use custom labels to tag seasonal products and create dedicated campaigns or ad groups for them. Increase bids and budgets as the season approaches, and update product titles to include seasonal terms. After the season ends, reduce bids rather than pausing products immediately, and remove seasonal title keywords. Plan seasonal feed updates at least four weeks before major events to allow time for processing and algorithm learning.
What is a good click-through rate for Shopping ads?
Average Shopping CTR is 1-2 per cent, with well-optimised campaigns achieving 2-4 per cent. CTR depends heavily on product image quality, pricing competitiveness, and ad position. If your CTR is below 1 per cent across your account, prioritise image quality and title optimisation. Individual products with very low CTR may have pricing or image issues that deter clicks.
How do I compete with larger retailers on Shopping ads?
Compete on specificity rather than volume. Focus your budget on your niche products where you have competitive advantages. Use long-tail query segmentation through negative keywords to target more specific searches where large retailers may not be as competitive. Highlight unique selling points like local delivery, specialist expertise, or exclusive products in your feed data. Free shipping and promotional annotations also help smaller sellers stand out.
Can I use Shopping ads for services or digital products?
Google Shopping is designed for physical products. Services, software subscriptions, and digital downloads are generally not eligible for Shopping ads unless they have a physical component (such as a software box or physical gift card). For non-physical products, use search campaigns and display campaigns instead.
How do I track the ROI of Shopping ads optimisation efforts?
Benchmark your key metrics (ROAS, CTR, conversion rate, impression share) before making changes, then measure the impact after each optimisation round. Track changes in a log noting the date, action taken, and metric impact. This lets you identify which optimisation activities deliver the greatest returns and prioritise future efforts accordingly. Over time, you build an evidence base that demonstrates the cumulative value of ongoing optimisation.
