E-commerce
October 1, 2026
Are you wondering how to balance automated bidding and manual control in Google Ads? The answer lies in a single sentence: use automation to save time, but keep an eye on key settings so you don't lose control of your spending. This is a crucial challenge for any e-commerce merchant who wants to make their online advertising profitable.
Automated bidding, such as Target CPA or Target ROAS, promises optimized performance thanks to machine learning. But without a minimum of supervision, you risk seeing your costs rise or your goals slip away. The secret? Finding the right balance between trust in algorithms and strategic manual interventions.
So how do you balance automated bidding and manual control in Google Ads? On the agenda:
What are the main automated bidding strategies in Google Ads?
How to set cost-per-acquisition goals at the ad group level?
Why is setting maximum cost-per-click limits essential?
How to choose the most relevant conversion actions for your campaigns?
What checklist should you adopt to keep control over your automated bidding?
Let's get started.
Summary
Why does automated bidding appeal to advertisers?
Automating bidding in Google Ads relies on machine learning. The objective: automatically optimize your bids to achieve a specific goal, such as a cost per acquisition (CPA) or a return on ad spend (ROAS). For an e-commerce merchant, this represents a considerable time savings. No more daily manual adjustments, the algorithm analyzes thousands of signals in real time to adjust your bids.
But this automation is not a magic wand. It requires thoughtful configuration and regular monitoring. Without this, you could let the machine make decisions that do not align with your business goals. Balance is therefore essential: leveraging the power of AI while keeping control over key parameters.
As a merchant, you need to understand the different strategies available and know when to use them. This is the first step in finding the right balance between automation and manual control.
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What are the main automated bidding strategies in Google Ads?
Google Ads offers several automated bidding strategies, each tailored to a specific objective. Here are the main ones:
Target CPA: you set your desired cost per acquisition, for example €25, and Google adjusts your bids to achieve this goal.
Target ROAS: you define a target return on ad spend, such as 300%, to maximize profitability.
Maximize conversions: Google aims to get as many conversions as possible within your budget.
Maximize conversion value: the algorithm prioritizes clicks that are likely to generate the highest value.
Maximize clicks: ideal for generating traffic, Google optimizes to get as many clicks as possible.
Target impression share: you target a specific impression share percentage for a given keyword.
Each strategy has its strengths and weaknesses. The choice depends on your objectives, your budget, and the maturity of your campaigns.
How do you set cost-per-acquisition targets at the ad group level?
By default, Target CPA is set at the campaign level. But not all ad groups within the same campaign deserve the same objective. Let's take an example: a campaign for coffee tables with a Target CPA of €50. Some models, like oval tables, may have a higher margin and support a CPA of €75. Others, like square tables, require a lower CPA, around €35.
By setting Target CPAs at the ad group level, you refine your bidding based on the actual profitability of each product. This is a powerful lever to maximize your return on investment. Google can estimate the performance of these objectives if you have enough historical data.
This approach gives you more granular control, without giving up the benefits of automation. It is a first step toward a controlled balance.
Why is setting maximum cost-per-click limits essential?
With "Maximize clicks" and "Target impression share" strategies, it is crucial to set a maximum cost per click (CPC). For target impression share, it is a requirement. To maximize clicks, it is highly recommended. Why? Because it protects you against excessive costs.
Let's look at a concrete example: with a budget of €50 and a maximum CPC of €2, you will get at least 25 clicks. Without this limit, Google could spend more per click, reducing the total number of clicks to 18, for example. By setting a limit, you control your spending while ensuring a sufficient volume of traffic.
This is an essential safety net for merchants who want to avoid unpleasant surprises. Automation should never come at the expense of budget control.
How to choose the most relevant conversion actions for your campaigns?
With smart bidding strategies, including "Maximize conversions" and "Maximize conversion value", you optimize for specific actions. The choice of these actions is decisive. For example, a product purchase is a much more valuable action than a newsletter sign-up. If you optimize for the newsletter, you risk attracting less qualified visitors.
It is therefore essential to select the conversions that have the greatest impact on your revenue. This could be a purchase, an add to cart, or a quote request. By focusing on the most significant actions, you guide the algorithm toward users more likely to generate revenue.
Remember that these strategies do not allow for a maximum CPC limit. The cost per click can therefore increase if Google deems the user more likely to convert. This is acceptable, provided that the targeted conversion is truly profitable.
What is a portfolio bid strategy and how do you use it?
Portfolio bid strategies allow you to apply the same strategy to multiple campaigns. It is a bit like negative keywords or ad extensions at the account level. For example, you may want to maximize conversions or achieve a target impression share across all of your campaigns. With a portfolio strategy, you define the strategy once and apply it to all relevant campaigns.
This simplifies management and ensures consistency in your objectives. It is particularly useful for merchants managing several similar campaigns. You centralize control while benefiting from automation.
However, this approach requires a clear vision of your overall goals. It is not suitable if your campaigns have very different objectives. In this case, individual strategies are more appropriate.
Why should you regularly review your bidding strategies?
Bidding strategies are not set in stone. They must evolve based on performance, seasons, and business objectives. A Target CPA that works in October may be too high in January, when efficiency becomes a priority. Similarly, you can transition from a "Maximize Clicks" strategy to a Target ROAS once you have accumulated enough data.
The golden rule: never "set it and forget it." Automation is a tool, not a miracle solution. You must monitor performance, analyze trends, and adjust your strategies accordingly. This is what makes the difference between a passive advertiser and a high-performing advertiser.
By regularly reviewing your bids, you ensure that your campaigns remain aligned with your profitability goals.
How to alternate between volume and efficiency depending on the period?
E-commerce merchants experience peaks in activity, such as the fourth quarter with the end-of-year holidays. During these periods, you can accept a higher Target CPA to capture a maximum number of sales. In January, on the other hand, efficiency becomes crucial, and you will need to reduce your cost targets.
This alternation between volume and efficiency is natural. It requires planning and responsiveness. Automation can help you adjust quickly, but you are the one who defines the directions. For example, you can start with "Maximize Clicks" to generate traffic, and then switch to a Target ROAS to make it profitable.
By anticipating these changes, you maintain control over the performance of your campaigns throughout the year.
What are the pitfalls to avoid with automated bidding?
Auction automation may seem appealing, but it comes with pitfalls. The first is relying entirely on the algorithm without supervision. The second is choosing irrelevant conversion actions, which distorts optimization. The third is neglecting maximum CPC limits, especially with click or impression share strategies.
Another pitfall is not adapting your strategies to market changes. Consumer behaviors evolve, and your bids must follow. Finally, not using portfolio strategies when relevant can cause you to lose efficiency.
By being aware of these pitfalls, you can avoid them and get the most out of automation.
How to measure the effectiveness of your automated bidding?
To find out if your automated bidding is working, you need to track key indicators. Cost per acquisition (CPA) and return on ad spend (ROAS) are the most obvious. But you also need to monitor the conversion rate, average cost per click, and impression share. These metrics give you a complete view of performance.
Use tools like Google Analytics to track this data. This allows you to identify campaigns that are performing well and those that need adjustments. Do not hesitate to compare the performance of your automated strategies with those of your manual campaigns to evaluate their relevance.
Regular measurement allows you to make informed decisions and adjust your bids accordingly.
How does Qstomy help optimize your Google Ads campaigns?
Qstomy, as a Shopify AI agent, does not directly manage your Google Ads bidding, but it can improve the efficiency of your campaigns by optimizing your store. By guiding visitors toward purchasing, recommending relevant products, and facilitating order tracking, Qstomy increases the value of each conversion. This translates into a better ROAS for your advertising campaigns.
Additionally, Qstomy helps reduce cart abandonment through smart follow-ups and automated customer support. By improving the shopping experience, you maximize the probability that paid clicks convert into actual sales. It is an ideal complement to your automated bidding strategies.
By integrating Qstomy into your Shopify store, you create an environment more conducive to conversion, making your automated bidding even more profitable.
What checklist should you adopt to keep control of your automated bidding?
Here is a practical checklist for balancing automation and manual control:
Define clear objectives: CPA, ROAS, impression share, depending on your priorities.
Segment your ad groups: adjust Target CPAs by group to reflect margins.
Set maximum CPC limits: especially for clicks and impression share strategies.
Choose the right conversions: prioritize actions that generate revenue.
Use portfolio strategies: for consistent management across multiple campaigns.
Review regularly: adjust based on seasonality and performance.
In brief
The balance between automation and manual control is the key to profitable Google Ads advertising. Use AI to save time, but keep control of strategic settings.
FAQ
Can I use manual bidding with Google Ads? Yes, but automation often offers better performance. The ideal approach is to combine both.
What is the best bidding strategy for a small budget? "Maximize clicks" with a maximum CPC is a good starting point to generate traffic.
How do I know if my Target CPA is too high? Compare it to your profit margin per sale. If it is higher, you are losing money.
To go further: Google Analytics for marketing: ads, traffic and performance (GA4) - Qstomy, How to drive traffic to an online store (SEO, ads, social media)? - Qstomy, How to optimize an e-commerce site for Google (step-by-step guide) - Qstomy, Optimize your SEO strategy with AI: Google framework, process and Shopify - Qstomy, E-commerce Searchandising: optimizing internal search with customer words - Qstomy, E-commerce SEO: guide to boosting your visibility in 2026 - Qstomy, E-commerce SEO strategy for category pages - Qstomy.
Enzo
October 1, 2026
