Performance Max asset groups: assets, signals and structure explained

Performance Max asset groups are the building blocks of a Performance Max campaign: each one holds a set of headlines, descriptions, images, logos and optional videos, plus the audience signals, search themes and (for retail) listing groups that tell Google what the creative is for. Google mixes and matches the assets inside a group to build ads for Search, Maps, Display, YouTube, Gmail, Discover and partner sites, so the way you split your themes into asset groups decides what the system can learn and what you can read back in reporting.

This guide covers what goes into an asset group, the asset limits Google publishes, how audience signals and search themes work, how many groups a campaign should have, how to read asset reporting without fooling yourself, and how Final URL expansion changes the picture. If you want the wider view of the campaign type first, the Google Ads management service page explains how Performance Max sits next to Search and Shopping in an account.

What is an asset group in Performance Max?

Google defines an asset group as a collection of creatives centred on a theme or related to a target audience. That definition matters more than it looks. In a Search campaign you write specific ads for specific keywords. In Performance Max you hand Google a pool of parts, and any asset in the group can be combined with any other asset from the same group to create an ad. A headline you wrote for a product page can end up next to an image you chose for a brand video, so every asset in the group has to make sense with every other one.

Each asset group carries four kinds of input:

• Assets: the text, images, logos and videos that Google assembles into ads.
• A final URL: the landing page the group points to, which also gives Google content to read.
• Audience signals and search themes: hints about who should see the ads and which searches are relevant.
• Listing groups: only for campaigns connected to a Merchant Center feed, these choose which products the group can advertise, using the attributes in your feed.

A campaign needs at least one asset group, and an asset group belongs to one campaign only. You cannot share an asset group between two campaigns, so if two campaigns need the same creative, you build it twice.

Which assets does a Performance Max asset group need?

Google's Performance Max specifications page lists minimums, maximums and character limits for each asset type. These numbers have changed several times since the campaign type launched, so check the live help page in your account before a large build. As published at the time of writing, the text and logo requirements per asset group look like this:

Text assets

The headline minimum is low, but filling only three slots gives Google very little to test. Write headlines that each carry a different idea: one with the product or service name, one with the main benefit, one with a proof point you can back up, one with an offer if you have a real one, and a short one under 15 characters for the placements that need it. Long headlines are used where a format has room for longer text, so they should read as complete sentences rather than two short headlines glued together.

The business name must match your domain or your legally verified business name, with no extra symbols or promotional text. Adding "Best price" or an emoji to the business name can lead to a disapproval that stalls the whole group.

Images and logos

Landscape images at 1.91:1 and square images at 1:1 are required. Google recommends 1200 x 628 pixels for landscape and 1200 x 1200 for square, and you can add up to 20 images per asset group. Vertical 4:5 images (960 x 1200 recommended) are optional and give Google a format for vertical placements. Files must be JPG or PNG within the published size limit.

Google also notes that logos with a transparent background may be shown on a white background in many placements. A white or very light logo on a transparent background can vanish, so test how your logo looks on white before you upload it.

Video

Video is optional, but leaving it out has a cost. If an asset group has no video, Google may automatically generate one from your images and text. The specifications page says you need your own videos in horizontal, square and vertical orientations, each at least 10 seconds long, to reach an "Excellent" ad strength and avoid auto-generated video. If brand control matters to you, supplying even simple videos in all three shapes is the safer route.

How do audience signals and search themes work in an asset group?

Audience signals are the most misunderstood part of Performance Max. They are not targeting. An audience signal tells Google where to start looking, and the system is free to show ads to people outside that signal when it predicts a conversion. The useful signals are the ones that carry information Google does not already have: your own customer lists, your website visitors, people who searched for specific terms on Google (custom segments), and the interests or life events that match your buyer.

Search themes work in a similar way for Google Search inventory. You add the phrases a buyer would type, and Google treats them as extra input on top of the queries it already predicts will perform. Search themes are optional and additive. Your account-level negative keywords and brand exclusions still apply to them. Google's help pages have quoted different caps on the number of search themes per asset group over time, so check the limit your account shows when you add them.

Two practical rules follow from this. First, write signals and themes that match the creative in the same group. A group whose images show running shoes and whose search themes are about hiking boots sends mixed instructions. Second, judge signals by what the group does, not by whether the audience report shows the exact people you listed, because the system is designed to go beyond them.

How many asset groups should a Performance Max campaign have?

Google's developer documentation sets a limit of 100 asset groups per campaign. That ceiling is far above what most accounts can use well. The limit that matters in practice is conversion volume. Each asset group shares the campaign budget and bidding, and a group that gets few conversions gives Google little to learn from and gives you little to read.

A sensible way to decide the split is to ask whether two themes need different creative, a different landing page or a different audience signal. If the answer is yes, they probably deserve separate asset groups. If the only difference is a product variant that uses the same images and the same page, one group is usually enough. Common splits include:

• One group per product category or service line, each pointing to its own category page.
• Separate groups for clearly different buyers, for example consumers and business buyers, when the message and proof points change.
• For retail feeds, groups built around listing groups, such as best sellers in one group and a seasonal range in another, so you can see each range's results. The Google Shopping campaign management page covers how feed structure shapes this.

Avoid creating near-duplicate asset groups that point at the same page with the same signals. They compete for the same impressions inside one campaign and split the data without adding new information.

How to read Performance Max asset and asset group reporting

Performance Max reporting has improved, but it still needs careful reading. The asset group report shows results for each group, and the asset report lists each asset used in the campaign. Google lets you add conversion columns to the asset group report, the asset report and the asset associations report, and this covers both your own assets and the text Google generates for you.

One trap is easy to miss. Conversions are not split between the parts of an ad. If an ad made from one headline, one description and one image produces one conversion, each of those three assets is credited with that conversion. Add up the asset rows and the total will be far higher than the conversions the campaign actually recorded. The same applies to conversion value. Use asset-level numbers to compare assets with each other inside a group, and keep the campaign and asset group views as your source of truth for results.

Google's own guidance adds a second caution: an asset with few conversions may still be helping the campaign, for example by making a combination work in a placement where it rarely gets the last click. Replace weak assets on a regular schedule, but do it with a reason, and replace them with something different rather than a reworded copy of the same idea.

Good reporting starts before the campaign does. If conversion tracking counts page views or duplicate form fills as conversions, every asset report will reward the wrong creative. Check your conversion actions and values first, and if you run GA4 alongside Google Ads, make sure the two are counting the same events. The GA4 setup and migration service page lists what a clean setup includes.

How Final URL expansion interacts with asset groups

Every asset group has a final URL, but by default Performance Max can send people to other pages on your domain when it predicts a better match. This is Final URL expansion, set at campaign level. When it is on, a person who searches for a specific product may land on that product's page instead of the category page you chose, and if text customization is also on, Google can write headlines and descriptions that match the page it picked.

This has three consequences for asset groups:

• Your asset group theme stops being a hard boundary. A group built for "office chairs" can drive traffic to a desk page if Google thinks it fits better.
• Reporting by asset group becomes less clean, because results inside a group may come from landing pages you did not plan for.
• Pages you never want as landing pages, such as careers, blog posts, login or out-of-stock items, need to be excluded. URL exclusions in the campaign settings handle this.

For lead generation sites with a few strong landing pages, a common choice is to turn Final URL expansion off so each asset group sends traffic only to its own page. For ecommerce sites with large catalogues, leaving it on with a tidy exclusion list can let the campaign reach product pages you never built groups for. Neither choice is right for every account. What matters is that the decision is deliberate and that you check the landing page report after a change.

Common asset group mistakes and what they cost

• Minimum assets only. Three headlines and the required images let the group launch, but give Google little to combine. The likely result is weak ad strength and fewer placements where the group can serve well.
• Mixed themes in one group. Because any asset can pair with any other, a group mixing two products produces ads where the headline and image disagree.
• No video. Google may generate a video from your images, and you have less say over how that video looks.
• Too many thin groups. Dozens of groups with a handful of conversions each make every report noisy and slow down learning.
• Reading asset conversions as additive. Summing asset rows overstates results, as explained above.
• Ignoring Final URL expansion. Leaving it on with no exclusions can send paid traffic to pages that cannot convert.

What this means for Thai advertisers

Many Thai brands advertise in both Thai and English. Language targeting in Performance Max is set at campaign level, and inside an asset group any asset can be paired with any other. If you put Thai and English headlines in one group, Google can build an ad that mixes the two languages. Keeping Thai and English creative in separate asset groups, or in separate campaigns with matching language settings, keeps ads coherent and makes the reporting readable.

Thai headlines also need care with the 30-character limit, because a Thai phrase translated from English often runs longer than the original. Write the short headlines in Thai from scratch instead of translating English ones, and check how they display on mobile. Search themes should include the Thai and transliterated terms people actually type, along with English product names that Thai buyers often search as-is. For businesses that already collect customer lists through LINE or a CRM, a properly consented customer list is one of the strongest audience signals you can add; the remarketing service page explains how first-party audiences fit into a wider plan.

Performance Max asset groups FAQ

How many asset groups can a Performance Max campaign have?

Google's developer documentation sets the limit at 100 asset groups per campaign, and every campaign needs at least one. In practice, the right number depends on how many themes need different creative, landing pages or audience signals, and on whether each group gets enough conversions to learn from.

Are audience signals the same as targeting in Performance Max?

No, audience signals are hints, not targeting. Google uses them as a starting point and can show ads to people outside the signal when it predicts a conversion, so signals work best when they carry information Google does not already have, such as your own customer lists.

Do I need to upload videos to a Performance Max asset group?

Videos are optional, but if you do not add any, Google may automatically generate videos from your other assets. Google's specifications say your own videos in horizontal, square and vertical formats, each at least 10 seconds, are needed to reach "Excellent" ad strength without auto-generated video.

Why do asset-level conversions add up to more than the campaign total?

Asset-level conversions add up to more because Google credits every asset in an ad with the full conversion. One conversion from an ad with a headline, a description and an image shows as one conversion on each of the three assets, so compare assets with each other and use campaign totals for results.

Should I turn off Final URL expansion?

Turn it off when each asset group must send traffic only to its chosen landing page, which is common for lead generation sites with a few strong pages. Leave it on, with URL exclusions for pages that should never receive ad traffic, when you have a large catalogue and want the campaign to reach pages you have not built groups for.

Getting asset groups right

Performance Max asset groups reward planning more than volume. Decide the themes first, give each one complete assets in every format, add signals that carry real information, and read the reports knowing how Google credits conversions. If you would like a second pair of eyes on how your Performance Max campaigns are structured, the team at Relevant Audience can review your asset groups as part of its Google Ads management service.