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Performance Max

Google's automated campaign type combining Search, Shopping, Display, YouTube, Discover, and Gmail inventory in one ML-driven campaign.

Performance Max (PMax) is Google’s automated, multi-inventory campaign type, introduced in 2021. PMax combines placements across Search, Shopping, Display, YouTube, Discover, and Gmail in a single campaign managed by Google’s machine-learning system. The advertiser provides creative assets, audience signals, and a budget target; the model handles inventory allocation, bidding, and audience optimization.

How Performance Max works

PMax extends the Smart Bidding model to a multi-channel campaign type. The advertiser configures an “asset group” (creative assets), provides audience signals (first-party data, custom intent segments, in-market audiences), and sets a conversion goal. Google’s ML then allocates spend across the available inventory in proportion to where the model predicts conversions will come from.

For ecom advertisers, PMax has largely replaced Shopping campaigns. For B2B advertisers, the picture is more mixed — PMax can dilute lead quality if not configured carefully because its inventory leans consumer-heavy.

The configuration checklist

The most common failure mode is not configuring PMax properly at launch. The minimum viable configuration:

• Brand exclusion list: on. Prevents PMax from spending on brand search terms. Default changed to opt-out in early 2026; verify on older campaigns.
• Conversion-value rules: on if margin can be measured. Tells the model to optimize for profitable conversions, not just any conversions.
• Final URL expansion: off if your domain has significant non-commercial content; on for clean ecom sites.
• Audience signals: upload first-party customer lists, customer-match audiences, and any in-market segments relevant to the product.

Reporting transparency

PMax was originally criticized for opaque reporting. By early 2026, Google has added asset-group-level insights showing which inventory and audiences are driving performance. The data is still aggregated above the impression level, but it’s usable for week-over-week diagnostic work.

When PMax is not the right choice

• B2B lead-gen accounts where YouTube/Display inventory dilutes lead quality.
• Accounts with broken conversion tracking. PMax leans heavily on Google’s ML, which is only as good as the signal it’s given.
• Accounts where the advertiser needs strict control over which queries trigger ads. PMax’s search-side targeting is broader than Search campaigns.

See also

• Smart Bidding — the underlying bidding system
• Automated bidding software — parent category

Maintained by Ruchika Rajput. Methodology and disclosures at methodology.