Performance Max represents Google's vision for the future of advertising — AI-driven campaigns that automatically allocate budget, select audiences, and optimize creative across every Google touchpoint with minimal manual management.
What PMax Does
You provide: campaign goal, budget, creative assets, and audience signals. Google's AI decides: which channels to use, which audiences to target, which creative combinations to show, and what bids to set in real-time for each impression.
Asset Groups
Instead of traditional ad groups, PMax uses asset groups — collections of up to 20 images, 5 videos, 5 headlines, and 5 descriptions. Google mixes these assets to create ads optimized for each placement and audience.
Audience Signals
You cannot force PMax to target specific audiences, but you can provide audience signals as starting guidance: customer email lists, website visitors, similar audiences, in-market segments. Google uses these as seeds, then expands beyond them.
When PMax Works Best
E-commerce with product feeds (replaced Smart Shopping), accounts with 50+ monthly conversions (AI has data to learn), clear conversion goals with conversion values, and advertisers wanting to expand beyond search to video and display.
PMax Limitations
Limited transparency (less insight into where ads run), reduced control (AI makes most decisions), cannibalization of brand traffic if brand exclusions are not set up, and poor performance for accounts under 30 conversions/month.
PMax + Standard Campaigns
Best practice: use PMax for broad reach and scale, keep standard Search campaigns for critical branded and high-intent terms where you need control. Both running simultaneously outperforms either alone in most accounts.