E-commerce
September 17, 2026
Wondering how to set up Performance Max campaigns for your Shopify store?
It’s simple: create a single campaign, set a budget and a conversion goal, then let Google’s automation deliver your ads across all of its channels. It is a powerful lever to increase your sales, provided you properly prepare your assets and your product feed.
A word of warning, however: transparency is limited, and you need to test before going all in. So how do you set up Performance Max campaigns? On the agenda:
What is a Performance Max campaign and why use it?
How to create your campaign and choose your goal?
What settings for targeting and URL expansion?
How to structure your asset groups and audience signals?
How to analyze performance and optimize your campaigns?
Let's go.
Summary
What is a Performance Max campaign and why should you use it?
A Performance Max campaign is a Google Ads campaign type that groups all your channels into a single entity: Search, Display, YouTube, Gmail, and Google Discover. Instead of managing each network separately, you provide your assets (images, texts, videos) and your product feed, and then Google's algorithm takes care of delivering the ads where they perform best.
For a Shopify merchant, this is a considerable timesaver. You no longer have to create a campaign for each network or manually adjust bids. Automation continuously optimizes to meet your goal, whether it's sales, leads, or traffic.
It is also a way to reach audiences you wouldn't have targeted with traditional campaigns. Google explores search intent and user behavior to find potential customers. In short, Performance Max is a powerful tool to boost your sales, provided it is configured correctly.
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How to create your campaign and choose your objective?
The first step is to create a new campaign in Google Ads and select the "Performance Max" option. Next, you set a daily budget and a conversion goal: volume (number of sales) or value (revenue). You cannot bid manually with this campaign type, but you can set a target cost per acquisition (CPA) or a target return on ad spend (ROAS).
Also choose the conversions to optimize: sales, sign-ups, phone calls. For a Shopify store, the main goal will typically be sales. If you have multiple goals, Google will ask you to prioritize the one that matters most to your business.
Tip: start with a modest budget to test, then increase gradually. The algorithm needs data to learn, so a budget that is too low can limit performance. Also, remember to link your Merchant Center account so Google can use your product feed.
What settings should be used for targeting and URL expansion?
In the campaign settings, you define the geographic areas to target and the ad schedule. But the most important setting is "Final URL expansion". This option, active by default, allows Google to replace your landing page with a more relevant one based on the user's search intent.
This may seem convenient, but it means you lose control over the landing page. If you want visitors to arrive on a specific page (for example, a product page or a collection page), disable this option. You can also exclude certain URLs to prevent Google from sending traffic to irrelevant pages.
My advice: disable URL expansion if you have a clear site structure and optimized landing pages. If you have a large catalog and you trust the algorithm, you can leave it active, but monitor the results.
How to structure your asset groups and audience signals?
After the settings, you create your first asset group. It contains your ads, your images, your videos, and your product feed. You can target all the products in your catalog or a selection. For example, if you sell clothing, you can create one asset group for dresses and another for shoes.
The audience signal is an optional but recommended step. It gives Google a starting point to find similar customers. You can use custom segments, your first-party data (like your email subscribers), interests, or demographics.
The more assets you provide, the more combinations Google has to test. This improves performance. Remember to include videos, even simple ones, as they are increasingly important in the results.
What assets should be provided to maximize performance?
For your Performance Max campaign to work, you must provide as many assets as possible. Google recommends at least 15 images, 5 logos, 5 videos (optional), 5 headlines of 30 characters, 5 headlines of 90 characters, a short description of 60 characters, and up to 4 descriptions of 90 characters.
Also add a call to action (CTA) and your business name. Google will test all combinations to determine which ones perform best. It is the same principle as responsive ads: the more material you provide, the more the algorithm can optimize.
Make sure your images are of high quality and representative of your products. Avoid overlaid text on images, as Google may crop them. Use visuals that catch the eye and make people want to click.
How to set up ad extensions?
Before publishing your campaign, add ad extensions. Extensions are additional information that enrich your ads: sitelinks, callouts, or structured snippets. They improve click-through rate and relevance.
For a Shopify store, sitelinks are particularly useful for directing users to key pages like "New Arrivals", "Best Sellers" or "Contact". Callouts can highlight benefits like "Free Shipping" or "30-day Returns".
Extensions are free and can significantly improve the visibility of your ads. Take the time to set them up properly, as they increase your ad's real estate and therefore the chances of a click.
How does auction bidding automation work?
With Performance Max, you do not manage bids manually. Google uses machine learning to adjust your bids in real time, based on the likelihood of conversion. You set a goal (CPA or ROAS), and the algorithm optimizes to achieve it.
This means Google can increase your bids on high-intent search queries and lower them on less relevant ones. This is a significant advantage, as it saves you time and improves the efficiency of your spend.
However, automation requires data. If your campaign is new, the algorithm needs to learn. Therefore, it is normal for performance to fluctuate at the beginning. Give it at least two weeks before judging the results.
What are the benefits and limitations of Performance Max?
The main advantage of Performance Max is simplification: a single campaign for all Google channels. This reduces complexity and allows the algorithm to find opportunities you wouldn't have seen. It is also an excellent way to reach new audiences.
The main limitation is the lack of transparency. You do not know on which network your ads are served (YouTube, Gmail, Discover, etc.) or which assets generate conversions. You only see aggregated data, making optimization difficult.
Additionally, Google does not show you the asset combinations that perform the best. You see the top-performing combinations, but without detailed data. This can be frustrating, but it is the price to pay for automation.
How to analyze the performance of your campaigns?
Despite the lack of transparency, there are ways to analyze performance. The Google Ads "Insights" report gives you information on the searches that triggered your ads, the audiences reached, and the trends. Use this data to adjust your audience signals and assets.
The "Assets" report is also useful: it ranks your assets as "Low", "Good", and "Best". This allows you to identify areas for improvement. For example, if an image is rated "Low", replace it with another.
Finally, track your conversions in Google Analytics to see how users behave on your site. This will help you understand which pages generate the most sales and optimize your conversion funnel.
What are the best practices for optimizing your campaigns?
To get the most out of Performance Max, follow these best practices: start by testing a subset of your products before launching everything. This allows you to validate performance without risking a large budget.
Provide as many assets as possible, especially videos. Videos are increasingly important and can significantly improve performance. Use high-quality images and avoid overlaid text.
Regularly monitor your reports and adjust your audience signals. If you see that certain audiences convert better, strengthen them. Don't hesitate to test different bidding strategies (CPA vs ROAS) to find the one that best matches your goals.
How does Qstomy help improve your Performance Max campaigns?
Qstomy, the Shopify AI agent, can complement your Performance Max campaigns by optimizing conversion on your site. While Google drives traffic, Qstomy guides visitors to purchase through personalized recommendations, upsell and cross-sell suggestions, and efficient order tracking.
Qstomy analyzes visitor behavior in real time to offer them the most relevant products. This increases the conversion rate and average order value, which improves the return on investment of your advertising campaigns.
Additionally, Qstomy can help reduce cart abandonment by sending smart reminders and offering customer support via chat. By improving the shopping experience, Qstomy maximizes the value of each visitor coming from your Performance Max campaigns.
What is the checklist before launching your Performance Max campaigns?
Before publishing your campaign, make sure you have:
A complete product feed in the Merchant Center, with up-to-date images and prices.
A clear conversion goal (sales, leads) and conversion tracking set up.
A variety of assets: images, logos, videos, headlines, descriptions.
Ad extensions: sitelinks, callouts, structured snippets.
A test budget to validate performance before investing heavily.
In brief
Performance Max is a powerful tool to boost your sales, but it requires careful setup and regular monitoring. Test, learn, and adjust.
FAQ
Can I use Performance Max with Shopify? Yes, by linking your Merchant Center account and setting up conversion tracking.
How long does it take to see results? Allow at least two weeks for the algorithm to learn and optimize.
Should I disable URL expansion? It depends on your strategy. If you want to control your landing pages, disable it.
To go further: Google Analytics for marketing: ads, traffic and performance (GA4) - Qstomy, How to optimize an e-commerce site for Google (step-by-step guide) - Qstomy, How to integrate Shopify with Amazon for products, stock and reviews? - Qstomy, Training an e-commerce chatbot with Shopify: using the right data without creating wrong answers - Qstomy, Which platform to choose to create an e-commerce site? - Qstomy, Increase sales with smart product recommendations - Qstomy, What e-commerce marketing strategy without an ad budget? - Qstomy.
Enzo
September 17, 2026
