A practical guide to Google Shopping ads

Google Shopping ads are the product listings with an image, price and store name that appear across the top of search results and in the Shopping tab. For most Australian online retailers they do a lot of the heavy lifting, because someone searching for a specific product is often close to buying. Get them right and they can become the most profitable part of a paid account.

What trips people up is that Shopping works nothing like a normal search campaign. There is no list of keywords you write and bid on. Instead, Google reads your product data and decides which searches to match you to. That single difference shapes everything about how you set up and manage these campaigns.

How Shopping ads actually work

Two things have to be in place before a Shopping ad can run: a Google Merchant Center account and a product feed.

Merchant Center is where your product data lives and where Google checks that your store meets its policies. The product feed is a structured file, or a live connection from your store, that lists every product you sell along with its attributes: title, description, price, availability, image, brand, identifiers and more.

When someone searches, Google looks at the words in the search and matches them against your product data, not against keywords you have chosen. If your feed describes a product clearly and accurately, Google can match it to the right searches. If the feed is thin or messy, you either miss searches you should win or show up for the wrong ones. This is why feed quality is the single biggest lever in Shopping, far more than bids.

Why feed quality decides your results

The product feed is your campaign. Spend your time here before anywhere else.

• Titles carry the most weight. Lead with the words shoppers actually search: brand, product type, then key attributes like size, colour, material or model. "Bosch 18V cordless drill kit" works far better than "DIY power tool special".
• Images need to be clean, well lit and on a plain background, with no logos, watermarks or promotional text overlaid. A poor image quietly kills click-through even when you rank.
• Attributes such as colour, size, gender, age group and material help Google understand and match products, and they power filters in the Shopping tab.
• Product identifiers matter. Supply correct GTINs (barcodes) where they exist, along with brand and MPN. Accurate GTINs help Google match your product to known items and can improve how often you show.
• Price and availability must match your website exactly. Mismatches cause disapprovals and erode trust.

A feed that is accurate, complete and written for how people search will outperform a neglected feed on a much larger budget.

Standard Shopping vs Performance Max

Australian retailers really have two ways to run Shopping inventory, and they suit different situations.

Standard Shopping campaigns run on the Search and Shopping networks and give you direct control. You can see search terms, add negatives, split products into tightly themed groups and set priorities. The trade-off is that they take more hands-on management.

Performance Max uses the same product feed but runs across Search, Shopping, Display, YouTube, Gmail and Discover, with Google's automation deciding placement and bidding. It can be a strong performer for retail, especially with solid conversion data and good assets, but it gives you less visibility and less manual control. We cover the detail in our guide to Performance Max, and many retailers run it as part of a broader paid search programme rather than in isolation.

A common, sensible approach is to test both against your own numbers rather than assume one is better. Whichever you choose, the quality of the feed underneath it still decides most of the outcome.

Structuring your campaigns

Lumping every product into one group makes it almost impossible to manage budget or read performance. Structure gives you control.

• Split products by category, margin or brand so you can set budgets and targets that reflect how each group actually earns.
• Separate your best sellers and highest-margin lines so they are not competing for budget with low performers.
• For Standard Shopping, use product groups to subdivide inventory and bid by what each segment is worth to you.
• Keep seasonal or clearance ranges in their own campaigns so short-term pushes do not distort your core reporting.

The aim is simple: be able to look at the account and see clearly which products make money and which drain it.

Negative keywords and priorities

Standard Shopping gives you two tools that Performance Max largely hides, and they are worth using well.

Because you cannot pick keywords, the way you shape traffic is through negatives. Watch the search terms report and add negatives for searches that will never convert: research-only queries, wrong product types, competitor model numbers you do not stock, or terms that pull window-shoppers rather than buyers.

Campaign priority lets you run the same products in more than one campaign and tell Google which to use first. A typical setup runs a low-bid, high-priority campaign as a catch-all and a higher-bid, lower-priority campaign for your priority products, using shared negatives to steer the right searches into the right campaign.

Common feed mistakes

Most Shopping problems trace back to a handful of avoidable feed errors.

• Generic titles that omit brand and product type, so Google cannot match them well.
• Missing or incorrect GTINs, which can suppress how often products show.
• Prices or stock levels that do not match the website, causing disapprovals.
• Low-quality images, or images with text and logos baked in.
• Letting the feed go stale, so out-of-stock products keep spending.
• Ignoring the diagnostics in Merchant Center, where disapprovals and warnings sit waiting to be fixed.

Clearing feed disapprovals and tightening titles often lifts results more than any bid change.

Measuring ROAS

Shopping is built for return on ad spend, so measure it that way. Track revenue against spend with proper conversion tracking and conversion values passed back from your store, then read performance by product group, not just at account level. A healthy blended ROAS can easily hide losing products propped up by a few winners.

Look at margin, not just revenue. A high ROAS on thin-margin products can be worth less than a lower ROAS on high-margin lines. If your store traffic converts unevenly, the page each product points to is part of the equation too, which is where conversion rate optimisation earns its keep alongside the ads.

If you would like help getting a clean feed in place and running Shopping in a way that ties spend to real profit, the team at Control Tower works with Australian retailers to do exactly that, and we are happy to take a look at your account.

---FAQ---

Q: Do I need keywords for Google Shopping ads? A: No. Shopping ads do not use a keyword list the way search campaigns do. Google matches your products to searches based on the data in your product feed, so titles, attributes and identifiers do the work keywords would normally do. You shape traffic mainly through negative keywords in Standard Shopping.

Q: What is the difference between Merchant Center and the product feed? A: Merchant Center is the account where your product data lives and where Google checks that your store and products meet its policies. The product feed is the structured list of your products and their attributes that you submit to Merchant Center, either as a file or a live connection from your store.

Q: Should I use Standard Shopping or Performance Max? A: It depends on your goals and how much control you want. Standard Shopping gives you visibility into search terms and direct control over negatives and structure. Performance Max uses the same feed across more channels with Google's automation. Many retailers test both against their own numbers rather than assuming one is better.

Q: Why do my Shopping products keep getting disapproved? A: The most common causes are prices or stock levels that do not match your website, missing or incorrect product identifiers, image policy issues, or missing required attributes. Merchant Center diagnostics list the specific reason for each disapproval, which is the first place to look.

Q: How do I know if my Shopping campaigns are profitable? A: Track return on ad spend with accurate conversion tracking and conversion values from your store, then read performance by product group rather than only at account level. Factor in margin, because a high ROAS on low-margin products can earn less than a lower ROAS on high-margin lines.