Performance Max Campaigns: What They Do and What You Control

What Performance Max is

Google's About Performance Max campaigns page describes it as a goal-based campaign type that gives access to all Google Ads inventory from a single campaign. You provide conversion goals (with an optional target CPA or ROAS), creative assets, optional audience signals, a budget and brand safety settings. Google combines those with its own predictions to decide bids, placements and which combination of assets to show.

You set fewer things by hand, so the campaign is only as good as the goals and material you give it: if conversion tracking is wrong, it optimises toward the wrong thing. Get measurement right first; our Google Tag Manager basics and GA4 basics guides cover the setup side.

When Google recommends it

Google lists Performance Max as the recommended option when:

• you have specific conversion goals, such as online sales or leads;
• you want to maximise performance without restricting where ads appear;
• you want all Google channels from one campaign;
• you want more reach and conversion value beyond keyword-based Search campaigns.

Google positions it as a complement to keyword Search campaigns, not a replacement. It can be created with the Sales, Leads, Website traffic or Local store visits and promotions objectives, or without a goal. If you are new to Google Ads, start with our Google Ads basics guide; Performance Max hides much of what a first Search campaign teaches you.

Asset groups

An asset group is a set of creatives built around one theme or audience: headlines, descriptions, images, logos, videos and a final URL. Any asset in a group can be combined with any other asset from the same group to build ads for every channel. A campaign can have several asset groups, and Google suggests basing them on the sections or categories of your website.

The text specifications on that page include:

• headlines: up to 30 characters, minimum 3 and maximum 15, with at least one of 15 characters or less;
• long headlines: up to 90 characters, minimum 1 and maximum 5;
• descriptions: up to 90 characters, minimum 2 and maximum 5;
• business name: up to 25 characters, matching your domain or verified business name;
• one final URL, and up to two display URL paths of 15 characters each.

Images come in horizontal (1.91:1), square (1:1) and vertical (4:5) formats, plus logos. If you upload no video, Google says one or more may be generated from your other assets; it recommends uploading at least one yourself.

Text customization and Final URL expansion also generate headlines and descriptions from your site. Google notes you stay responsible for the accuracy of generated assets, so review them in the asset report.

Audience signals

Audience signals are optional suggestions added to an asset group. Google's audience signals page lists the inputs: your own data (website visitors, app users, customer lists, video viewers), custom segments built from keywords, similar websites or apps, demographics, and Google's segments such as in-market and affinity.

The important detail is in Google's note: Performance Max may show ads to people outside your signals if they are likely to convert. A signal is a starting hint, not targeting. If you need ads to reach only a defined group, a signal will not enforce that.

A customer list is personal data you are passing to Google, so check that your privacy notice covers it; our website privacy basics guide covers what that notice should say.

Search themes and how it sits next to Search campaigns

Performance Max uses what Google calls keywordless targeting: it decides which searches to show for from your assets, website and feeds. Search themes let you add words and phrases that describe what customers search for, especially things your website does not make obvious. Google suggests distinct, broad themes that add new information, and up to 50 of them.

If you also run Search campaigns, Google's prioritization rules decide which campaign serves:

1. an exact match keyword identical to the search term wins;
2. then phrase and broad keywords or search themes identical to the search term;
3. then the most relevant ad or asset group, judged by AI;
4. then the highest Ad Rank.

Search themes carry the same priority as phrase and broad match keywords. So if a search matters to you and you want your own ad and landing page for it, an exact match keyword in a Search campaign takes precedence over Performance Max.

Final URL expansion and URL controls

With Final URL expansion turned on, Google may replace the final URL you set with a page from your site it judges more relevant to the search, and create a matching dynamic headline. Google recommends it; whether it suits you depends on your site. Every page that can be chosen becomes a possible landing page, so a site with thin, outdated or non-commercial pages can send paid clicks to the wrong place.

Google gives three ways to steer it:

• URL exclusions: block specific pages such as About, careers, the privacy policy or out-of-stock products. These can only be added when Final URL expansion is on.
• URL Contains rules: include or exclude whole sections by a path such as /shoes or /blog. Google warns that rules that are too broad can limit reach.
• Page feeds: a list of URLs, used with custom labels, to restrict serving to those pages or prioritise them.

Whatever you allow, each page should be able to convert a visitor on its own. Our landing page basics guide covers what that takes.

Negative keywords and brand exclusions

Performance Max supports negative keywords, but Google describes them as highly restrictive and recommends them only for brand safety or clearly irrelevant terms.

For your own brand name, Google recommends brand exclusions instead. They block your ads on searches for a brand, including common misspellings and subsidiary brands, and in Performance Max apply to both Search and Shopping ads. Google suggests this when you handle brand searches in a separate Search campaign and do not want Performance Max paying for people who were already looking for you. It can also be used for a competitor's brand.

Reading the reports

Because Performance Max decides placement itself, its reports are how you see what it did. Google lists asset-level metrics, asset group reporting, placement reports, Google Analytics integration and the channel performance report. That last one, under Insights and reports, shows how each channel contributes to your goals, with a status per channel: Not eligible, Eligible (Limited), Eligible or Missing required assets. Its diagnostics flag issues such as disapproved asset groups or missing assets, for example a square image for Display.

Check whether the conversions it reports match the leads or sales you actually received.

Frequently asked questions

Does Performance Max replace my Search campaigns?

Google describes it as a complement to keyword-based Search campaigns. When a search term is identical to an exact match keyword in a Search campaign, that keyword is prioritized over Performance Max. Search themes have the same priority as phrase and broad match keywords.

Do audience signals limit who sees my ads?

No. Google says Performance Max may show ads to relevant people outside your signals if they are likely to convert. Signals help the campaign learn faster; they are not targeting restrictions.

Can I stop Performance Max sending clicks to pages like my blog or careers page?

Yes, if Final URL expansion is on you can add URL exclusions for exact pages, URL Contains rules such as /blog, or use page feeds to limit serving to a list of URLs. You can also turn Final URL expansion off so ads use the final URL you set.

How do I stop Performance Max showing on searches for my own brand?

Google recommends brand exclusions rather than negative keywords. They also block common misspellings and subsidiary brands, and in Performance Max apply to Search and Shopping ads.

Want landing pages and tracking ready before you spend on Performance Max? See our website development service and all our services, or email [email protected].