Google Shopping: how it works and when it pays off

Every month in Italy around 5,400 people search for “Google Shopping”, word for word, on Google. They are retailers wanting to understand how it works, and business owners wondering whether it’s worth trying for their own e-commerce store.

The short answer is almost always yes. The long answer depends on how you set it up, what you sell and how much you’re prepared to pay for each click.

In this article we look at how Google Shopping works, how it differs from Performance Max, when it isn’t the right choice and how much it really costs to bring qualified traffic to your online shop.

What Google Shopping is and why it matters for your e-commerce business

Google Shopping isn’t a separate platform. It’s the ad format that shows your products, with image, price and shop name, directly in Google’s search results.

People searching for “women’s running shoes” or “industrial vacuum cleaner” see the product listings first, then the traditional text links. The product with the clearest image and the most legible price catches the eye before the user has read a single word written by the advertiser.

A keyword isn’t enough to appear there. You need a product feed connected to Google Merchant Center, kept up to date with the title, image, price, availability and category of every item in your catalogue. As Google Ads’ official guide to Shopping ads explains, it’s Google that decides which search triggers which product, based on how well the feed data matches the searcher’s intent.

For an e-commerce business, the practical difference is this: someone who clicks a Google Shopping ad has already seen the product’s price and image. They land on the product page knowing what to expect, and that almost always translates into a higher conversion rate than a generic text ad.

Think of two advertisers selling the same industrial vacuum cleaner. The first writes a generic headline and a text ad. The second shows the product photo, the exact price and the shop name, before anyone has even clicked. Someone searching for that specific product, intending to compare prices, almost always picks the second: they already have the information they were looking for, without having to open the page.

How a Google Shopping campaign works, from feed to auction

The product feed and Google Merchant Center

Since 2024 Google has revamped the Merchant Center interface: for a while it was called “Merchant Center Next”, and since July 2026 it has gone back to being called simply Google Merchant Center, with no other technical changes. The product feed is still the heart of the system, but setup is more guided than in the old version.

Each product needs a unique identifier (GTIN, where available), the correct Google Product Taxonomy category and a title that genuinely reflects what shoppers search for, not just the internal name you use in your management system.

Grouping products by brand, category or margin, rather than leaving them all in one block, then lets you assign different budgets to the products that sell well and to those that need more visibility to take off.

The auction and ad position

Unlike the Search Network, in this format you don’t bid on keywords. You bid per product, or per product group, and Google automatically decides which searches to match to which item in the catalogue.

So the price you pay per click depends as much on the quality of your feed as on the competition for the same product.

Google Shopping or Performance Max: what’s the difference?

This is where the most common confusion arises. Since 2022 Google has pushed businesses to migrate from the old Smart Shopping campaigns to Performance Max.

Today a Performance Max campaign with a connected product feed automatically includes Google Shopping ads, together with Search, Display, YouTube, Gmail and Maps.

Standard Google Shopping campaigns, on the other hand, are still available and show only the product format, without touching the other channels. They’re easier to read in reports, because they don’t mix the results of several formats in the same row of data. They remain a sound choice if your goal is to keep control of cost per product rather than of the whole funnel.

If you already run Performance Max campaigns and want to understand when to choose them over a dedicated Shopping format, we’ve written a complete guide to Performance Max campaigns, with practical examples and mistakes to avoid.

It’s also worth looking at what changes with AI Max for Search campaigns, which Google is gradually extending to the same Shopping ads.

When Google Shopping isn’t the priority

Not all catalogues perform the same way. If you sell a single, very specific product, with few variants and an audience that already searches for you by name, a classic Search campaign may cost less per result than setting up and maintaining a feed would.

The same goes for businesses selling services or made-to-measure products with no fixed price to show up front: the product listing loses most of its advantage if the real price only emerges after a quote.

If the catalogue is small, fewer than twenty or so products, the time spent looking after the feed needs weighing against the traffic those few products can actually generate.

In none of these cases does it mean giving up advertising on Google. It often means favouring targeted Search campaigns, with copy that explains the value of the product or service, rather than betting everything on a format that works best when price alone is already a good selling point.

How much does a Google Shopping campaign cost?

In Italy, the cost per click for the most commercial searches related to the Italian for “Google Shopping campaigns” is around €10.82, considerably higher than the average CPC of €1.62 associated with the more informational, generic version of the same search.

The difference makes sense: people typing “Google Shopping campaigns” are considering investing in them, while those searching only for the generic term are often still finding out.

The minimum useful budget depends on the number of products in the catalogue and the margin per item. An e-commerce business with tight margins and a low average order value needs high volumes to make the CPC sustainable. A B2B e-commerce business, or one with high-ticket products, can comfortably absorb a higher CPC.

We go into more detail, with budget examples by industry, in our article on Google Ads prices.

How to set up (or improve) your Google Shopping campaigns

Before launching or fixing a Google Shopping campaign, a few checks really make a difference:

1. Product titles written the way users would search, not the way you name them internally in your management system.
2. Clean images, with no watermarks or overlaid text, in line with Merchant Center guidelines.
3. The correct Google Product Taxonomy category for every item, not just the best-sellers.
4. Monthly exclusion of products that generate clicks but no sales, so you don’t waste budget.
5. A connection to a Google Ads remarketing list, so that people who visit without buying come back through a dedicated campaign.

Paid traffic works better when it isn’t isolated from the rest of the strategy. We covered this in our guide to e-commerce SEO, written for businesses that want to depend less on paid traffic alone.

If you’d rather not manage the organic side yourself, our SEO agency can take care of it together with the rest of your digital strategy. You’ll find more articles on the subject in the e-commerce section of our blog.

The most common product feed mistakes

Most problems don’t come from the auction but from the feed. A product with a missing or wrong GTIN is often rejected or penalised at the approval stage, even if it’s perfectly available on the website.

Another frequent mistake is a mismatch between the price in the feed and the actual price on the product page: a promotion launched on the website but not updated in the feed is enough to get the listing suspended. Google compares the two values regularly, and repeated discrepancies weigh on the quality of the whole account.

Images with watermarks, borders or overlaid text are penalised too: the product format works because it shows the real item, not a promotional graphic. Regularly checking approval status in Merchant Center, product by product, is still the quickest way to catch these problems before they eat into budget and visibility. The most frequent errors, one by one, are in our guide to Google Merchant Center and the product feed.

In short

Google Shopping works when the product feed is well looked after, the budget reflects the real margin per item and the campaign doesn’t operate in isolation from the rest of the digital strategy.

Whether you choose a standard Shopping campaign or a Performance Max campaign that includes the same ads, the principle stays the same: show the right product to people already searching for it, with the price visible from the very first click.

If you want to find out whether your Google Shopping campaigns are performing as well as they could, or you haven’t launched them yet, we can look at the numbers together. Book a call, or take a look at how we set up PPC campaigns for the clients we work with.