Performance Max In Google Ads, How The Campaign Works
Summarise this blog
Key Takeaways
- Performance Max, or PMax, is Google’s automated campaign that uses AI to run ads across every channel (Search, Shopping, YouTube, Display, Discover, Gmail and Maps) from one campaign.
- Its strength is machine learning that hunts the best conversions against the goal you set.
- It depends on a properly built asset group and accurate audience signals.
- Watch for brand keyword cannibalisation, and use the campaign-level controls and channel reporting Google has added since 2024.
- Give the system time to learn before judging it.
If you are a marketer or a brand owner planning advertising on Google, you have probably heard of, or been told to use, a campaign called Performance Max, or PMax. When it launched, plenty of people wondered what PMax was and why Google was pushing it to replace the old Smart Shopping campaign.
Anyone running online marketing today needs the basics of what Google Ads is and how to use it well. The arrival of Google Performance Max was a turning point in ad tech, advertising technology, because it brought every ad channel in Google’s ecosystem, Search, Display, YouTube, Gmail, Maps and Discover, under one campaign.
This article goes into what Performance Max in Google Ads is, how it works underneath, the asset group settings people most often get wrong, and how it compares with Demand Gen, as a guide a marketer can apply.
Table of Contents
How Does Performance Max Work
Performance Max is a system that uses AI to work from the goal you set and deliver ads automatically across every Google surface from one campaign: Search and Shopping on the search side, and YouTube, Display, Discover, Gmail and Maps on the network side. The system learns and picks the channel with the best chance of a conversion in real time.
One campaign across every ad surface is what sets Performance Max apart from other campaign types. Rather than splitting the budget between Search, Display and YouTube campaigns yourself, PMax takes one budget and allocates it across channels automatically according to what users are doing at the time.
An Example Of Cross-Channel Delivery
- A user sees your banner on Google Discover.
- The next day they watch a video on YouTube and see your ad again.
- Finally they go to Google Search and type a related keyword. PMax shows a Search or Shopping ad immediately, to prompt the click and the purchase.
Performance Max Bidding
The whole system runs on automated bidding, and the advertiser chooses one of two main goals.
- Conversion volume. The system finds as many purchases or form completions as it can within the budget. A target cost per conversion (target CPA) keeps the ad cost from climbing too high.
- Conversion value. The system looks for customers likely to buy bigger or higher-value items. A target return on ad spend (target ROAS) sets the expectation, for example revenue at 5 times the ad cost.
Target CPA or target ROAS has to be set from real data. Push the system too hard, say by setting the cost of one customer far below what is realistic, and the AI stops delivering because it judges the target unreachable.
How To Set Up An Asset Group And Audience Signals
PMax does not use ad groups with keywords in them. It uses an asset group, with audience signals to give the AI a direction.
Structuring The Asset Group
The asset group holds every piece of creative, for the AI to combine into the right ad format for each channel automatically. The key is not to pile every product into one asset group. Split by product category or by promotion, men’s products and women’s products for instance, so the copy and the images stay consistent.
Fill the asset group completely:
- Text. Short headlines, long headlines and descriptions up to the number the system recommends, covering the strengths, the promotion and the brand name.
- Images. High-quality images in landscape, square and portrait, so the system can fit them to each banner.
- Logo. The brand logo is square and landscape.
- Video. A short brand video. Without one, the system builds a slideshow video from your images and text automatically, and the result may not match the brand as well as it should.
Using Audience Signals Well
Audience signals do not force the ad to show only to those people. They are a hint to the AI about what your core customer looks like, so it finds similar people faster. The more precise the input, the faster the system learns.
Fill these in completely:
- Your data. Uploading an existing customer database, or people who have been added to a basket, is the strongest signal there is, because it tells the system who the real customers are.
- Custom segments. The keywords customers use to search, or the sites of competitors in the market.
- Interests. The main interests related to the product or service.
- Demographics. The age range and gender of the core audience.
The Heart Of E-Commerce, Managing The Data Feed
For a brand selling online, Performance Max is inseparable from Google Merchant Center, because the system pulls product data into Shopping Ads, which is where PMax generates most of its revenue.
For product ads to show ahead of competitors, tune the data feed on four points.
- Product titles. Clear names carrying the important keywords: brand, model, colour or size, so the system matches searches precisely.
- Product descriptions. Complete detail with the relevant keywords.
- Product identifiers. Global product codes help Google understand what you are selling and compare it correctly with competitors.
- Product images. A white background with the product clearly visible, and no text or watermark over it.
Performance Max Vs Demand Gen
Performance Max aims at revenue across every Google channel. Demand Gen aims at building demand and brand awareness through channels that lead with images and video, such as YouTube Shorts, Discover and Gmail.
| Performance Max | Demand Gen | Standard Search or Shopping | |
|---|---|---|---|
| Main goal | Conversions, revenue, leads | Interest, brand awareness | People already searching |
| Where it shows | Every Google channel | YouTube, Discover, Gmail | Search or Shopping network only |
| Ad formats | Images, video, text, products | Vertical and landscape video, images | Text, or product image and price |
| Audience handling | Guided by audience signals | Lookalike audiences | Exact keywords or defined audiences |
| Budget handling | AI allocates one budget across channels | Allocated across Google’s social surfaces | Controlled separately per campaign |
Which To Choose
If the goal is more revenue and you want the ad in every channel including Search, choose Performance Max. If the goal is reaching new customers through video content that holds attention, choose Demand Gen.
Which Businesses Should Use Performance Max
Performance Max suits a brand with a clear conversion goal: e-commerce, a service brand collecting leads, or a brand with a physical shop wanting more visits. It also needs a budget large enough to let the AI keep learning for several weeks.
Brands That Suit PMax
- E-commerce and retail. With Google Merchant Center, connect the product feed to PMax and the system pulls images and prices into Shopping Ads automatically, and turns product images into banner ads as well.
- Service brands collecting leads. Clinics, property, or B2B firms. With accurate conversion tracking in place, PMax finds the people likely to fill in a form or send a message asking for information.
- Brands with a shop. Set a store-visit goal through Google Business Profile and the ads concentrate on Google Maps and local search nearby.
Brands That Do Not Suit PMax
- A brand with a very small daily budget. Running across several platforms at once, the AI will not gather enough clicks or conversions to learn from.
- A brand with strict corporate identity rules, because you cannot control completely which image and which text the system pairs.
- A site without complete conversion tracking. Running PMax when the system cannot record results puts you at a disadvantage and the campaign does not deliver.
Things To Watch In Performance Max Campaigns
From a digital marketing specialist’s view, Performance Max involves trade-offs an advertiser should know about and prepare for.
1. Brand Keyword Cannibalisation
The AI looks for the fastest route to a conversion, which is usually showing the ad when someone searches your brand name directly. PMax then takes clicks that SEO or an existing Search campaign would have won, and the reported return looks better than it is. The fix is brand exclusions in the campaign, which force the system to find new customers through generic searches instead.
2. Managing Negative Keywords
In a standard Search campaign you can add negative keywords freely. PMax could not do that at first, and that limitation is widely remembered. It no longer applies. Google added campaign-level negative keywords to Performance Max in December 2024, raised the cap from 100 to 10,000 in March 2025, and made shared negative keyword lists available in August 2025. Account-level negatives remain as well. Use them to keep the ad off searches that have nothing to do with the brand and stop the budget leaking.
3. Reporting Limits
PMax used to reveal much less than Search. Where Search shows spend by keyword in detail, the old PMax placement report gave impressions only, with no cost or clicks by channel, so working out which channel paid was close to impossible. That has improved. In 2025 Google added channel-level performance reporting, which shows spend and conversions across Search, Shopping, Display, YouTube, Discover, Gmail and Maps, and a search terms report for Performance Max. Reporting is still less granular than a Search campaign, and advanced users still reach for Google Ads Scripts to pull deeper data, but the blind spot the campaign was known for has largely closed.
4. Automatic Video Generation
With no video in the campaign, the system builds a slideshow from your images and text automatically, and the result can look unprofessional. Upload at least 1 or 2 brand videos of around 10 to 15 seconds yourself.
5. The Learning Period
PMax needs a lot of data. The rule is to change nothing in the first 2 to 4 weeks, because the system is testing and gathering data. Cut the budget, restructure, or change the goal repeatedly and the system starts learning again, and the campaign never settles. Google’s own guidance suggests allowing up to 6 weeks before judging results.
Conclusion, And The Next Step In Advertising
Performance Max uses AI to make advertising broader and more efficient, which means the advertiser has to understand asset group setup, data feed management, accurate audience signals, and the campaign’s limits, to avoid wasting budget.
Technical understanding and a correctly built account structure are what decide whether the campaign succeeds. To lift revenue and talk through a Google Ads service, Primal’s specialists are ready to plan Performance Max systematically around your brand’s goals. Our Google Ads management service is the place to start, and the team is available today.
Frequently Asked Questions About Performance Max (FAQs)
| Question | Answer |
|---|---|
| Does Performance Max only allow automated bidding (Smart Bidding)? | Yes. PMax does not support manual CPC, so the choice is Maximise Conversions or Maximise Conversion Value only, because the system needs the flexibility to adjust bids in real time across every channel. |
| How much budget should PMax have? | A common recommendation is a daily budget of at least 3 to 10 times the expected cost per conversion, so the system has enough to test and process in the first 2 to 3 weeks. Set it too low and the campaign may stall or fail to learn customer behaviour. |
| Does PMax overlap with a standard Search campaign? | With a Search campaign on exact-match keywords, the Search ad always takes priority over PMax. With broad match, the system works out which campaign has the better chance of closing the sale and shows that one, to stop the account competing with itself. |
| How many asset groups can one Performance Max campaign hold? | Up to 100 per campaign. Creating more than necessary is not recommended. The best practice is to split asset groups by product category or by audience, so the copy and images communicate precisely and stay easy to manage. |
| How do you handle the learning phase for a short promotion, such as an 11.11 campaign or a flash sale? | For a campaign running only 1 to 3 days, do not create a new PMax campaign, because the system cannot learn in time. Use the existing PMax campaign and set seasonality adjustments, the advanced tool that tells the AI in advance that conversions will spike for a short period, so it accelerates delivery without relearning. |
| Can PMax be stopped from showing on certain apps or sites? | Yes. You cannot pick placements directly, but account-level placement exclusions block children’s gaming apps, unsuitable YouTube channels, or low-quality sites, so the ad stays away from anywhere that would damage brand safety. |
| What is ad tech, and how does it affect Performance Max? | Ad tech, advertising technology, uses AI and large volumes of data to manage campaigns automatically. In Performance Max it analyses user behaviour, adjusts bids through Smart Bidding, and chooses the placements that pay best, without the campaign manager adjusting every setting by hand. |
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