Performance Max asset groups are the closest thing you have to control inside a campaign that otherwise hides most of its levers. Get them right and Google has clean, relevant creative to match to each audience and placement. Get them wrong, and you end up with one bloated asset group selling everything to everyone, with the campaign quietly spending on your brand name and your cheapest products.
The short answer: build one asset group per distinct product theme or customer intent, give each one its own final URL, its own audience signal, and a full set of text, image, and video assets, and never mix unrelated products in one group. In our experience, three to eight well-defined asset groups beat one catch-all group almost every time, as long as each one has enough budget to gather data.
This guide walks through how asset groups actually work, how to decide how many you need, what to put in each one, and how to test them without breaking the campaign. If you are still deciding whether Performance Max is right for your store at all, read our comparison of Google Shopping vs Performance Max first.
What an asset group is (and what it is not)
An asset group is a container of creative inside a Performance Max campaign: headlines, long headlines, descriptions, images, logos, videos, a business name, a final URL, call-to-action options, and optional audience signals. Google combines those assets into ads for every placement it serves, from Search and Shopping to YouTube, Display, Gmail, Discover, and Maps. According to Google’s own documentation on how asset groups work, each asset group is meant to be organized around a single theme, much like an ad group in a Search campaign.
What it is not: an asset group is not a targeting unit with its own budget or its own bid. Budget and bidding live at the campaign level. Audience signals attached to an asset group are suggestions to the algorithm, not hard targeting. And in retail campaigns, product selection happens in listing groups, which sit inside the asset group but behave differently from the creative assets around them.
That distinction matters because many advertisers try to use asset groups as a way to “control” spend between product lines. They cannot. If you need separate budgets or separate ROAS targets, you need separate campaigns, not separate asset groups.
How many Performance Max asset groups do you need?
Google’s best practices for asset groups recommend creating a separate asset group for each theme of products, services, or audiences you want to reach, and keeping the creative in each group consistent with its landing page. There is no official maximum that you will realistically hit (the limit is 100 per campaign), but there is a practical floor on data: an asset group that gets a handful of conversions a month will not give you readable signals.
Typical structures that work:
- Ecommerce with a few product categories: one asset group per category (for example, “Running shoes,” “Trail shoes,” “Accessories”), each pointing to the category page, with a listing group filtered to that category.
- Ecommerce with a clear bestseller tier: one asset group for bestsellers with their own creative, one for the long tail, and one for seasonal or clearance items you want to push.
- Lead generation with several services: one asset group per service (for example, “Boiler installation,” “Boiler repair,” “Annual service plans”), each with its own landing page and audience signal.
- Multi-market accounts: if you serve the US and Europe from one account, keep campaigns separate by market (currency, language, and feed differ), and let asset groups split by product theme within each campaign.
A reasonable starting point for a small or medium account is three to five asset groups. Add more only when a theme has distinct creative, a distinct landing page, and enough volume to justify it.
What goes into a strong asset group
Google reports asset group “Ad strength” from Poor to Excellent. The rating is not a performance guarantee, but Google’s creative best practices for Performance Max are clear that more and more varied assets give the system more combinations to test. Here is what we aim for in every asset group:
| Asset type | Minimum required | What we add | Notes |
|---|---|---|---|
| Headlines (30 chars) | 3 | 10–15 | Mix product, benefit, offer, and brand headlines. Avoid five variations of the same sentence. |
| Long headlines (90 chars) | 1 | 4–5 | Used mainly on Display and Discover; write them as full value propositions. |
| Descriptions (90 chars) | 2 | 4–5 | Include at least one with shipping, returns, or guarantee details. |
| Images | 1 landscape, 1 square | 10–15 across landscape, square, portrait | Product on clean background plus lifestyle shots; no heavy text overlays. |
| Logos | 1 | 2 (square + landscape) | High contrast; test on light and dark backgrounds. |
| Videos | 0 (Google auto-generates) | 3–5 (vertical, square, landscape) | Upload your own; auto-generated videos usually look generic. |
| Final URL | 1 | 1, matched to the theme | Category or service page, not the homepage. |
| Audience signal | Optional | 1 per group | First-party lists plus custom segments built from your best search terms. |
Two rules that save a lot of grief. First, every headline must make sense next to every description and every image, because Google will combine them in ways you did not plan. Second, the final URL for each asset group should match the listing group products and the creative exactly. If the asset group is “Trail running shoes,” the URL is the trail shoes category, the images show trail shoes, and the headlines say trail running. Consistency is what lets Google learn the theme.
Audience signals: useful, but not targeting
Audience signals tell the algorithm where to start. The most valuable signals are the ones Google cannot guess on its own: your customer list, past purchasers, high-value visitors, and custom segments built from converting search terms. Interest and in-market segments are fine as a supplement, but on their own they rarely move results. One signal per asset group, aligned with the theme, is enough; stacking everything into one signal just blurs it.
Search themes: your way to tell PMax what to chase
Search themes (up to 25 per asset group) let you add the queries you want the campaign to consider. Treat them like a shortlist of your best non-brand keywords for that theme. They do not restrict the campaign, and they are lower priority than exact-match keywords in your Search campaigns, so they will not cannibalize a well-run Search account. Keep them tight: “waterproof trail running shoes,” not “shoes.”
Step-by-step: restructuring a messy Performance Max campaign
- Map your catalog or services into themes. Group by what a customer would search for, not by how your warehouse is organized. Three to eight themes is typical.
- Confirm each theme has a landing page. If a theme does not have a dedicated page, build one before you build the asset group.
- Create one asset group per theme. Name it after the theme so reports stay readable (for example, “AG – Trail shoes”).
- Filter listing groups to match. In retail campaigns, each asset group’s listing group should include only that theme’s products. Overlapping products across groups make the data unreadable.
- Load the full asset set. Aim for Excellent ad strength, but prioritize relevance over quantity. Fifteen headlines that all say the same thing are worse than eight distinct ones.
- Attach one audience signal and 10–25 search themes. Use first-party data where you have it.
- Add brand exclusions at campaign level. If you do not, a surprising share of “Performance Max conversions” will be people who searched your brand name. Our Performance Max optimization tips cover brand exclusions and other campaign-level settings in detail.
- Let it run two to three weeks before judging. Restructuring resets learning. Resist the urge to edit assets daily.
Testing and optimizing asset groups
Performance Max reports asset-level performance labels (Low, Good, Best) and, as of this year, an asset group report with conversions, cost, and conversion value per group. Use both, but understand their limits: the labels are relative within the asset group, and a “Low” asset in a strong group may still outperform a “Best” asset in a weak one.
A practical monthly routine:
- Replace assets labeled Low for more than four weeks with a new variation, one or two at a time. Do not swap half the group at once.
- Compare asset groups on conversion value per cost (or cost per lead). A group that is consistently far below the campaign average usually has a landing page or product-margin problem, not a creative problem.
- Check the asset group’s share of spend. If one group takes 70% of budget, ask whether that is because it converts best or because its products are cheapest. Low-margin items can win the auction while losing you money.
- Pause asset groups for themes that are out of stock or out of season instead of deleting them; you keep the history for next year.
For bigger changes, such as a new creative direction or a different landing page, Google Ads experiments let you test a Performance Max variant against the original with a split of budget, and campaign-level A/B tests of asset group edits are now rolling out in the interface. That is a cleaner read than editing the live asset group and trying to compare before and after.
Common asset group mistakes we see in audits
When we run a Google Ads audit, asset groups are usually one of the first three issues. The pattern is familiar: one asset group with “All products,” the homepage as final URL, three headlines, auto-generated video, no brand exclusions, and an audience signal made of every interest category in the dropdown. The campaign reports a decent ROAS, but when you look at the search terms through Insights, most of the volume is brand and the rest is the cheapest SKUs.
Other frequent problems: asset groups that duplicate each other with identical products and creative (they compete internally and split the data), text assets that violate Google’s ad policies and quietly limit serving, and images with so much text overlay that they get rejected on some placements. None of these are hard to fix, but they are easy to miss when the campaign dashboard looks green.
FAQ
How many asset groups should a Performance Max campaign have?
Enough to cover each distinct product or service theme, typically three to eight for a small or medium business. One asset group per theme, each with its own landing page and audience signal. Fewer, well-fed groups beat many starved ones.
Can I set a budget per asset group?
No. Budgets and bid strategies are set at the campaign level. If two product lines need different budgets or ROAS targets, split them into separate Performance Max campaigns.
Do audience signals restrict who sees my ads?
No. Audience signals are a starting point for the algorithm, not targeting. Google will expand beyond the signal to anyone it predicts is likely to convert. Campaign-level exclusions (brand lists, customer lists where available) are the only hard restrictions.
Should I use Google’s auto-generated videos?
Only as a fallback. If you upload no video, Google will create one from your images and text, and it usually looks generic. Even a simple 15-second vertical video shot on a phone tends to perform better and lets you control the message.
How long before I can judge a new asset group?
Give it at least two to three weeks and a meaningful number of conversions. Judging an asset group on three days of data leads to pausing things that were about to work.
What is Ad strength and does it affect performance?
Ad strength is Google’s rating of how complete and varied your assets are. It is a diagnostic, not a ranking factor. Aim for Good or Excellent because it means Google has more combinations to test, but do not pad the group with repetitive assets just to move the label.
Need help with your campaigns?
If your Performance Max campaign is one big asset group and you are not sure where the money is going, we can rebuild it properly. Our Performance Max Setup service includes asset group structure, feed alignment, brand exclusions, and conversion tracking checks, and ongoing Google Ads Management covers the monthly asset testing routine described above.
Not sure what is broken? Book a free 30-minute call and we will look at your campaign structure together.