Google favours high Ad Strength responsive search ads, but lower-rated ads convert better, Search Engine Journal reported on November 3. Ad Strength is Google's rating of how relevant, diverse, and complete a responsive search ad's assets are. The finding, that the ads Google prefers are not always the ads that convert best, is a useful warning against optimising for a platform score instead of for a business outcome.
Responsive search ads are built from multiple headlines and descriptions that Google combines automatically into different ad variations. Ad Strength rates that combination on factors such as the number and diversity of assets, the relevance of headlines to keywords, and whether the ad uses the available asset slots. A higher rating is meant to indicate a better-prepared ad, and Google has historically encouraged advertisers to reach Excellent Ad Strength by adding more varied assets.
The rating is a diagnostic, not a performance guarantee. It measures the inputs to an ad, not the outputs. An ad can have many diverse headlines and still fail to persuade the right user, just as an ad with fewer, sharper headlines can convert well because it says exactly what a buyer needs to hear. The November report's finding makes that distinction concrete: favouring, in terms of serving or preference, does not automatically mean converting.
Google's ad system has incentives beyond any single advertiser's conversions. A diverse ad can match more queries, fill more auctions, and give the automated system more combinations to test. That is useful for Google's auction and for advertisers who want reach, but it does not guarantee that the combinations shown to a particular user will be the most persuasive ones. Automation optimises for the signals it can measure at scale, and a platform score is easier to measure at scale than a nuanced human judgment about copy.
There is also a simpler explanation: ads with higher Ad Strength may be served more often, giving them more impressions, while lower-rated ads, served less often, may convert at a higher rate on the impressions they do receive because their copy is more specific. That would produce exactly the reported pattern without any contradiction. Frequency and efficiency are different metrics, and an advertiser who confuses them will misread both.
Advertisers should treat Ad Strength as a checklist, not a target. Use it to catch missing assets, repetitive headlines, or irrelevant copy, and then judge the ad by its results: click-through rate, conversion rate, cost per conversion, and incremental value. If a lower-rated ad converts better, keep it, and investigate why. Its headlines may be more specific, its offer may be clearer, or its message may match a particular audience better than a broader, higher-rated ad does.
Testing is the way to resolve the tension. Run the high-rated and low-rated versions in a controlled comparison, with the same budget, targeting, and landing page, and compare conversions rather than impressions. Also test whether adding assets to a strong, specific ad improves it or dilutes it. Sometimes more assets help. Sometimes they give automation room to show a weaker combination. Only a test, not a score, can tell which is true for a given account.
For SEOs, the parallel is familiar. Search has its own platform scores and diagnostics, from Core Web Vitals to content quality signals, and optimising for the score without checking the outcome is a recurring trap. A page can pass every technical check and still fail to satisfy a searcher, just as an ad can earn an Excellent rating and still fail to convert. The discipline is the same: use the diagnostic to find problems, then judge by the result that matters to the business.
For link builders and content marketers, the lesson is about message specificity. A broad, varied message reaches more people, but a specific message converts the right people. When building landing pages for ads, or content to support them, favour clarity and relevance to a particular audience over completeness for its own sake. The ad that converts is usually the one that speaks to one buyer clearly, not the one that tries to speak to everyone at once.
Sources: Search Engine Journal, November 3, 2026.
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