Google Performance Max is a significant update to Google’s campaigns, now supporting vertical 9:16 image ads. This enhancement empowers brands to seamlessly integrate their campaigns into the increasingly dominant mobile-first digital landscape, particularly within popular short-form video environments like YouTube Shorts. The move underscores Google’s commitment to optimising ad formats for contemporary consumption habits, ensuring advertisers can capture user attention where it’s most concentrated.
Google Performance Max: Blending Seamlessly into Mobile Experiences

The introduction of vertical “Story Image Ads” into Google Performance Max campaigns marks a strategic evolution in how businesses connect with their audiences. Previously observed in Demand Gen campaigns, these immersive, full-screen vertical visuals are now accessible within Google’s highly automated PMax platform. This allows for a more natural and less intrusive ad experience on mobile devices, crucial for platforms where vertical content reigns supreme.
Key specifications for the new vertical image ads include:
- Minimum size: 600×1067 pixels (with a recommended size of 1080×1920 pixels for optimal display).
- Maximum file size: 5MB.
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While Google has not yet provided official confirmation on all serving placements, industry experts anticipate these ads will primarily appear in high-engagement areas such as YouTube Shorts Image placements, mirroring their successful deployment in Demand Gen campaigns. This strategic focus ensures that Google Performance Max campaigns can leverage the immense reach and user engagement found in these dynamic, short-form content ecosystems.
Marketing professionals are already recognizing the profound impact of this update. Phil Byrne, Founder of Positive Sparks Marketing LTD, emphasizes that this goes beyond mere creative specifications. “It’s about meeting users where they naturally consume content,” Byrne states, highlighting the critical importance of adapting ad formats to align with prevalent user behaviors on platforms like YouTube Shorts, Reels, and TikTok.
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This update further solidifies Google’s ongoing efforts to monetize short-form content. Mike Ryan, Head of Ecommerce Insights, points out that Google Performance Max is already effectively utilizing YouTube Shorts through “GMC Image Shorts,” which present multiple product images for remarketing and personalized user experiences. The expanded support for vertical images in PMax is a clear indicator that Google is continuing to deepen its investment in shoppable, short-form media, providing advertisers with powerful new tools to drive conversions and enhance brand visibility in the mobile-first era.
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