Performance Max (PMax): Definition, How It Works, and Best Practices

Updated September 3, 2026· 6 min read

Performance Max (PMax) is Google’s AI-driven campaign type for inventory across Search, Display, YouTube, Gmail, Maps, and Discover. An advertiser supplies headlines, images, video, a landing page, and a conversion goal. Google’s machine learning then selects the channel, placement, and audience for each impression based on that goal.

Performance Max usually sits within paid search because conversion goals and account structure determine how its automation performs.

Performance Max replaced Smart Shopping and Local campaigns. Google’s Performance Max documentation, accessed 2026 describes its goal-based automation across Google Ads channels.

How Performance Max Works

A PMax campaign uses asset groups containing headlines, descriptions, images, logos, and videos. Advertisers can also provide audience signals such as customer lists or site visitors.

Google combines those inputs with auction signals to choose a channel, format, and bid. The campaign can serve across eligible Google inventory.

Because the algorithm controls channel and placement selection, an advertiser cannot always identify which placement drove a conversion. Reporting is more aggregated than it is in a traditional Search or Display campaign.

Performance Max vs Search vs Display

PMax sits apart from traditional Google Ads campaign types because it combines what they each do individually into one automated unit.

Campaign type	Channels covered	Targeting control	Placement-level reporting
Search	Google Search results only	Keyword-based, advertiser-controlled	Yes, by keyword and search term
Display	Google Display Network sites and apps	Audience and placement targeting, advertiser-controlled	Yes, by placement
Performance Max	Search, Display, YouTube, Gmail, Maps, Discover	Asset groups and audience signals, AI-controlled	No, aggregated only

PMax combines inventory that an advertiser could otherwise manage through separate campaigns. In exchange, it provides less granular keyword and placement control than dedicated Search and Display campaigns.

Performance Max Best Practices

PMax rewards a different management approach than keyword-based campaigns:

• Feed it strong assets. More headline, image, and video variations give the algorithm more combinations to test; thin asset groups cap performance.
• Use audience signals, not hard targeting. Signals guide the algorithm’s starting point but do not restrict delivery, so treat them as a hint, not a filter.
• Add negative keywords via account-level lists. PMax cannot exclude search terms the way a Search campaign can, except through account-level negative keyword lists Google added after advertiser pushback.
• Watch for brand cannibalization. Because PMax can also serve on branded search terms, always check search term insights (limited as they are) and segment brand performance from your Search campaigns.
• Give it time to learn. Like most automated bidding, performance is unstable in the first one to two weeks while the algorithm gathers signal.

In our accounts, PMax is evaluated beside a well-structured Search campaign. Separate Search coverage can preserve clearer control over important queries and messages.

We also provide relevant first-party audience signals from retargeting. Those inputs guide early delivery, but conversion quality remains the deciding measure.

What does current evidence show about Performance Max (PMax)?

IAB and PwC found that 2024 United States internet advertising revenue totaled $258.6 billion after 14.9% year-over-year growth.

Source for Performance Max market context: IAB annual digital ad revenue report, 2024.

What has AC learned from Performance Max (PMax)?

Our view: Performance Max needs disciplined inputs because channel automation reduces direct control. We verify conversion goals, asset coverage, feed quality, and exclusions first, then judge incremental business results instead of celebrating platform-reported volume alone.

FAQs

• What did Performance Max replace? PMax replaced Smart Shopping campaigns and Local campaigns, folding their functionality into one broader, AI-managed campaign type.
• Can I see which channel drove a PMax conversion? Not at the individual placement level. Google provides aggregated insights and asset-level performance ratings, but not the same placement transparency as Search or Display campaigns.
• Does Performance Max use keywords? No. PMax uses audience signals and asset groups instead of keywords, though it can still match to search queries using Google’s understanding of your assets and landing page.
• Should I run Search and PMax together? Yes, most advertisers run a dedicated brand Search campaign alongside PMax to retain control over branded terms. PMax can also bid on brand searches.
• How long does Performance Max need to optimize? Give the campaign enough time to gather representative conversion data before judging it. The needed period depends on budget, volume, conversion lag, and recent changes.