Overview of the Test
Google is currently testing larger header images for publisher profiles in Google Discover, as noted by SEO expert Barry Schwartz. This test, reported on March 10, 2026, follows a recent core update designed to enhance publisher branding and control. The larger, magazine-style visuals replace the standard small avatars currently in use, potentially allowing select publishers to upload high-resolution images at a recommended size of 1200×675 pixels.
This shift aligns with ongoing changes since the February 2026 Discover core update, which emphasized local content and quality signals. As Google aims to refine user experience, the implications for publishers are significant, particularly regarding visibility and brand identity.
Impact of February 2026 Core Update
The February update prioritized local content, drastically changing how Discover distributes articles. NewzDash data showed that New York-based domains appeared five times more frequently in local feeds compared to California ones. This change reduced the number of unique domains in U.S. Discover feeds, making it crucial for publishers to adapt their strategies in order to maintain visibility in a more competitive environment.
With the addition of larger header images, publishers in the top Discover domains may see improved engagement metrics if they align their content with Google’s evolving standards. However, this test is not a guaranteed traffic boost; rather, it is part of ongoing A/B testing that only targets select users.
Operational Considerations for Publishers
Publishers must prepare for these changes by verifying their profiles through Google Search Console and ensuring their header images are optimized for mobile devices. The risk of misinterpreting the test as a guaranteed traffic boost is high, especially if publishers fail to meet Google’s stringent E-E-A-T (Experience, Expertise, Authoritativeness, Trustworthiness) standards. Those who rely on clickbait tactics may find themselves penalized, with potential traffic drops of 30-50% due to high bounce rates exceeding 70%.
Real human bylines have shown to increase rankings by 15-20% in past tests, indicating that topical depth and authentic author representation are key. Publishers should focus on producing high-quality, relevant content that aligns with user interests to maximize their chances of being featured in Discover.
Financial Implications and Revenue Potential
This test could have broader financial implications for publishers, particularly if a global rollout occurs mid-2026. Enhanced controls and the potential for higher click-through rates (CTRs) could drive significant revenue—estimates suggest upwards of $500 million annually for the top 100 publishers. This projection mirrors the impact of Accelerated Mobile Pages (AMP) in its early days, where improved visibility led to increased ad revenue.
As AI-driven publisher matching becomes more prominent, niche authorities may find themselves favored in Discover’s algorithms. The shift toward magazine-like personalization could further enhance user engagement, resulting in a 20% uplift in branded sessions for compliant publishers.
Future Outlook
In the next 6 to 12 months, expect Google to finalize its testing phase and potentially roll out the larger header image feature across all eligible publishers. However, with the emphasis on quality content and local relevance, those who fail to adapt to these requirements may face declining visibility in Discover. The industry should prepare for increased competition and the necessity of strong brand identity as Google continues to refine its content delivery methods.
