PPC

Performance Max Campaigns: A Practical Guide for E-Commerce

20 February 2026 9 min read

Performance Max (PMax) campaigns are Google's most powerful (and most opaque) campaign type. When set up correctly, they can drive exceptional e-commerce results across Search, Shopping, Display, YouTube, Gmail, and Discover — all from a single campaign.

How Performance Max Works

Unlike traditional campaigns where you choose placements and keywords, PMax uses Google's AI to find the best customers across all Google properties. You provide the assets (text, images, videos) and conversion goals, and Google handles the targeting.

Setting Up for Success

The foundation of a successful PMax campaign is your data:

Conversion tracking: Accurate GA4 conversion tracking is essential. PMax optimises toward your conversion goals, so if tracking is wrong, everything is wrong.
Product feed: Your Merchant Center feed needs optimised titles, descriptions, and high-quality images
Audience signals: While PMax handles targeting, audience signals (customer lists, website visitors, in-market audiences) help the AI find the right people faster

Pro Tip: Upload your customer email list as an audience signal. This gives PMax a strong starting point for finding similar high-value customers.

Asset Group Structure

Organise asset groups by product category or theme. Each asset group needs:

At least 5 headlines (including keyword-rich options)
At least 5 descriptions
Multiple images in various aspect ratios
At least one video (or Google will auto-generate one, which is typically poor quality)

Optimisation Tips

Let campaigns run for at least 4-6 weeks before making major changes
Monitor the Insights tab for search term themes and audience segments
Regularly update assets and remove underperformers
Use brand exclusions to prevent PMax from cannibalising branded search traffic
Set a target ROAS once you have sufficient conversion data (50+ conversions)

When to Use PMax vs Standard Shopping

PMax works best when you have strong conversion data and want broad reach. Standard Shopping gives more control and visibility. For most e-commerce brands, we recommend running both: PMax for broad acquisition and Standard Shopping for your top-performing products where you want tight control.

Managing Performance Max campaigns effectively requires constant monitoring and optimisation. Get in touch for expert PMax management.