Advertising · · 3 min read
Shopping ads for Shopify — Google Shopping setup, feed quality, and what actually converts
Google Shopping is one of the highest-ROI ad channels for e-commerce. Most Shopify stores aren't getting that ROI because the feed is wrong. Here's the guide.
By Mediseo
Google Shopping ads — the image-based product listings that appear at the top of Google search results — are one of the most direct paths to purchase-intent traffic in e-commerce. A user who searches "brown leather wallet men" and sees your product photo, price, and brand name is further down the purchase funnel than virtually any other ad channel delivers.
The challenge is that Shopping performance is determined almost entirely by feed quality, and most Shopify stores have feeds that are incomplete or suboptimally structured.
How Shopping ads work
Unlike search ads, Shopping ads don't use keywords you bid on manually. Instead, you provide a product feed to Google Merchant Center, set bids and budgets in Google Ads, and Google matches your products to relevant searches based on what's in your feed.
This means the feed is the strategy. Every element of your feed — product titles, descriptions, categories, attributes — influences which searches trigger your ads and at what cost.
Setting up the Shopify → Merchant Center connection
The standard approach is the Google & YouTube channel app in Shopify. It syncs your product catalog to Google Merchant Center automatically and handles the bulk of the feed setup.
After connecting:
- Verify and claim your website URL in Merchant Center
- Enable "Shopping ads" and "Free listings" under the Shopping tab
- Accept the policies (read them — violating Google's Shopping policies causes account suspension)
- Set up conversion tracking in Google Ads so you can measure actual purchases, not just clicks
Approval takes 1–3 business days. Google reviews each product against their policies. Common rejection reasons: images with promotional text overlaid, price mismatch between feed and website, incomplete contact information on the store.
Feed quality: where most stores lose
The default Shopify → Google connection syncs your product data as-is. If your product data is weak, your Shopping performance will be weak.
Product titles matter more than almost anything else. Google uses your title as a primary signal for query matching. A title like "Men's Wallet - Brown" underperforms "Brown Leather Bifold Wallet for Men — RFID Blocking, Slim Profile." Include material, color, gender, size (where relevant), and key features. Front-load the most important attributes.
GTINs (Global Trade Item Numbers) — barcodes, UPCs, ISBNs. Google requires GTINs for products that have them (branded goods, published books, etc.). Missing GTINs on required products restricts your ad visibility significantly.
Product category (Google taxonomy): The automatic category assignment is often too broad. Manually assigning specific categories improves targeting and can unlock certain Shopping features.
High-quality images: Shopping ads are visual. Images on white backgrounds perform well for Shopping. Lifestyle images can be added as additional images. Avoid images with text overlays — they typically get rejected.
Price accuracy: The price in your feed must exactly match the price on your website at the time of the click. Even a small discrepancy (sale price not updated, currency rounding) can trigger product disapprovals.
Campaign structure
Performance Max campaigns are Google's current default for Shopping. They use Google's automation across Search, Shopping, Display, YouTube, and Gmail. They work well when you have enough conversion data (roughly 50+ conversions per month) for the algorithm to optimise.
Standard Shopping campaigns give you more manual control — you can bid by product, exclude specific products, and see more granular data. For stores just starting out or with lower conversion volume, Standard Shopping is often more predictable.
A practical starting structure:
- One campaign for best-sellers (products with proven conversion history) with higher bids
- One campaign for the broader catalog with lower bids
- Exclude non-converting products from Shopping and shift budget to what's working
Measuring performance
The key metrics for Shopping:
- ROAS (Return on Ad Spend): Revenue ÷ spend. Target varies by margin, but 300–500% is typical for healthy campaigns
- Impression share: What percentage of eligible searches are you showing up for? Low impression share means either your bids are too low or your feed quality is limiting reach
- Cost per conversion: Absolute acquisition cost per sale
Review at the product level, not just the campaign level. Often 20% of products drive 80% of conversions. Shift budget toward those products.
Shopify Shopping is something we set up and manage as part of our advertising service. If your current Shopping campaigns aren't performing or you haven't set them up yet, book a call and we can review your feed and structure.