Google Ads for ecommerce helps you promote products across Google’s network. You can use different Google Ads campaigns—from shopping ads that show products directly in search results to remarketing ads that target your previous online store visitors.
Google Search still dominates the internet. In its Q1 2026 earnings, Alphabet reported 19% year-over-year revenue growth for search and other advertising, with CEO Sundar Pichai noting that Google queries hit an all-time high. That means you can reach more people than ever in the contexts where they’re searching and considering products.
Here’s how Google Ads works, the main campaign types available, ways to measure campaign performance, and how to manage Google Ads for ecommerce.
What are Google Ads for ecommerce?
Google Ads is an online advertising platform where you can create ad campaigns that appear across Google’s advertising network, which includes:
-
Google Search
-
Gmail
-
Google Display Network
Once you create a Google Ads account, you can connect your product catalog—through Google Merchant Center or the Google integration on Shopify—so ads show live product prices, availability, and variants.
Some campaigns target shoppers actively searching for products; others reach people in other contexts based on previous browsing activity or interests. Search and shopping campaigns run on a pay-per-click (PPC) model where you’re charged only when someone clicks your ad. Video and display ad placements are often priced by impressions or views (for video ads), depending on the campaign type.
Google doesn’t sell its ad placements at a fixed price. Every time someone searches for a product, Google runs a split-second auction among sellers targeting that query (“vegan wallet,” for example). You set a maximum bid—the most you’re willing to pay for a click—but you usually pay just enough to edge out the seller with a bid just under yours.
Google combines bid amount, ad quality, and ad relevance to determine whose ad shows and in what order. For example, a lower bid with a highly relevant ad can outrank a higher bid with a less relevant ad.
Google Ads campaigns can start showing ads within a day of approval, and performance typically takes a few weeks to stabilize as Google’s bidding algorithms gather conversion data.
Types of Google Ads campaigns
- Search campaigns
- Shopping campaigns
- Performance Max campaigns
- Demand Gen campaigns
- Display campaigns
- Remarketing campaigns
Different Google Ads campaigns support different stages of the buying journey. Rather than relying on a single campaign type, many businesses combine several campaign types as they grow:
Search campaigns
Search campaigns are text ads that appear on Google’s search engine results pages when shoppers search for relevant products.
You can organize related search terms into ad groups, write relevant ad copy, and use negative keywords (search terms that you can instruct Google Ads not to use to target your ads) to avoid paying for irrelevant searches.
Shopping campaigns
Shopping campaigns show images, prices, and retailer information directly in Google Shopping and, sometimes, Google Search results.
Unlike search ads, Google uses information from your product feed in Google Merchant Center instead of relying primarily on manually selected relevant keywords.
Performance Max campaigns
Performance Max runs ads across Google Search, Shopping, YouTube, Gmail, Maps, Discover, and the Google Display Network from a single campaign.
You upload creative assets and your product feed, and Google’s AI combines them into different ad formats, then decides which placements to serve them in. It uses Smart Bidding (Google’s AI-powered bidding system that sets and adjusts bids in each auction based on contextual signals) along with other automated bidding strategies.
Demand Gen campaigns
Demand Gen campaigns are image and video ads across YouTube, Discover, and Gmail. Unlike search campaigns that respond to active search queries, these introduce products to shoppers in the awareness stage of the buyer journey using audience signals to reach likely customers. You can also use the campaigns to reengage past store visitors or promote new collections and product launches to former customers.
Display campaigns
Display campaigns place visual ads across the Google Display Network of more than two million websites, news sites, blogs, YouTube, and mobile apps that have agreed to show ads. These campaigns help you build awareness and reach potential customers as they browse other websites and mobile apps.
Remarketing campaigns
Remarketing ads reconnect with people who previously visited your website. Dynamic remarketing ads go one step further by automatically displaying the specific products a shopper viewed, helping you stay visible as customers continue comparing products online.
Ways to measure Google Ads performance
Regular reporting shows which campaigns drive sales and where you can improve your results.
Return on ad spend (ROAS)
ROAS measures how much revenue your campaign generates for every dollar spent on advertising. For example, if an ad campaign generates $5,000 in revenue from $1,000 in ad spend, its ROAS is 5:1. Comparing ROAS across campaigns can help identify where advertising budgets are producing the best returns.
Cost per click (CPC)
CPC measures how much you pay when someone clicks your ad. Costs vary depending on competition, your bidding strategy, and the relevance of your ads. A low CPC isn’t a goal in itself; cheap clicks from the wrong shoppers still cost money. Consider it along with cost per acquisition (CPA) and ROAS to see whether the traffic you’re buying converts.
Cost per acquisition (CPA)
CPA measures how much it costs to generate a sale or other conversion. Comparing CPA with average order value (AOV) and your profit margin provides a clearer picture of profitability than clicks or impressions alone.
Attribution
Attribution identifies which marketing channels contributed to a conversion. Connecting Google Analytics 4 (GA4) to your Google Ads account lets you see how different Google Ads campaigns contribute to the customer journey. This includes ones that assist a sale without getting the final click.
How to use Google Ads for ecommerce
- Connect your products
- Create a campaign
- Set up conversion tracking
- Set your budget and bidding strategy
- Enter Google’s ad auction
- Measure performance
Here are the steps to use Google Ads from setup to measurement:
1. Connect your products
Shopping campaigns and retail Performance Max campaigns run on a product feed rather than on ad copy you write. Google pulls titles, prices, and images straight from your catalog. That feed lives in Google Merchant Center, and most ecommerce platforms offer an integration that syncs your catalog automatically.
On Shopify, that’s the Google & YouTube sales channel app. Search, Display, and Demand Gen campaigns don't need a feed, so if you're starting with those, you can set up Merchant Center later.
Your product feed includes titles, descriptions, pricing, availability, product categories, and high-quality images so Google can create Shopping ads and retail Performance Max campaigns.
You can also connect GA4 to your Google Ads account. GA4 tracks events like purchases and add-to-cart actions, and you can use audience segments you create on the platform to improve ad targeting and remarketing.
2. Create a campaign
Next, create a Google Ads account or sign up, and add your business details, website, and billing information.
New accounts open in “smart mode,” a simplified setup that hides most campaign types and hands bidding decisions to Google. You can switch to “expert mode” to unlock the full range of campaign types and controls.
In expert mode, choose a campaign type based on your goal, whether it’s sales, leads, website traffic, awareness and consideration, app promotion, or local store visits. This filters the campaign types Google offers next.
For example, choosing Sales surfaces Shopping and Performance Max, whereas Awareness and consideration surfaces Display and Demand Gen. You can also see every option at once by selecting “Create a campaign without a goal's guidance.” Then, name your campaign and confirm the type.
3. Set up conversion tracking
Before you bid, tell Google what counts as a conversion based on your campaign goals. On Shopify, the Google & YouTube sales channel configures purchase tracking when you connect your account.
Google Ads then optimizes based on conversions recorded in your Google Ads account, which is what makes Smart Bidding work. Target CPA and target ROAS, for instance and learn from completed conversions. Without tracking, “maximize conversions” has nothing to optimize toward and nothing to learn from.
4. Set your budget and bidding strategy
Before launching your campaign, set your Google Ads budget—how much you’re willing to spend—and how Google should bid on your behalf. You can set a daily budget, then choose a bidding strategy based on your goal, like maximizing clicks, conversions, or ROAS.
Beginners often start with Smart Bidding, selecting a Target CPA or Target ROAS, depending on their goal. If you’re more experienced, you might choose manual cost per click (CPC), which lets you set maximum bids for individual keywords or placements. If you’re unsure, run one and compare conversions, CPA, and ROAS against your goals before switching.
5. Enter Google’s ad auction
Once you launch your campaign, Google automatically enters your ad into real-time auctions whenever it matches a search query or another eligible placement. Google looks at factors like your bidding strategy, ad quality, and the relevance of your ad copy. It also considers how closely your products or keywords match the user’s search intent to determine whether your ad appears and where it ranks relative to competing ads.
Say two retailers show up for the same search, and one bids a bit higher but runs a generic ad that sends shoppers to a cluttered homepage. The other bids less, but its ad speaks directly to what the shopper searched for and links to a fast, relevant product page. The second advertiser can win the top spot (and pay less per click) because relevance and experience also count.
6. Measure performance
Google Ads reports ad campaign metrics like clicks, impressions, CPC, conversions, CPA, and ROAS. GA4 adds the cross-channel view—that is, how paid traffic behaves on your site, and how your campaigns contribute to journeys involving more than one touchpoint. If your campaign generates plenty of clicks but few sales, you might refine your keywords or ad copy. If acquisition costs are too high, you could adjust your bidding strategy or audience targeting.
Google Ads for ecommerce FAQ
Which Google Ads campaign should ecommerce beginners start with?
Businesses selling physical products often start with shopping campaigns because they use data from Google Merchant Center to create shopping ads automatically. As campaigns mature, search campaigns and Performance Max can help expand reach.
How much should I budget for Google Ads?
There’s no minimum daily budget or monthly budget for Google Ads. Google says you can start using Target CPA with no conversion history, and it works for campaigns of any size (conversion tracking is the prerequisite, not spend). Google advises being comfortable spending up to twice your average daily budget on a given day. When evaluating results, use a window with at least 30 conversions, which is what Google recommends for a reliable read.
Do I need Google Merchant Center?
You only need a Google Merchant Center if you want to run Google Ad types that require information from your product feed. Google shopping campaigns and retail Performance Max campaigns require Google Merchant Center. Search, display, and Demand Gen campaigns run without a feed, so you can launch those with a Google Ads account alone.
Can Shopify help me manage Google Ads?
Yes. Shopify’s Google & YouTube sales channel lets you connect a Google Ads account, sync products with Google Merchant Center, and create Performance Max campaigns. You can also enable ecommerce tracking through Google Analytics 4 (GA4), reducing the amount of manual campaign management required.
