Ad Strength is a rating Google Ads gives to a responsive search ad, and to asset groups in Performance Max, to show how well the ad follows its best practice for variety and relevance. The scale runs Incomplete, Poor, Average, Good and Excellent, and the rating updates as you type in the ad editor.
How Ad Strength works
The rating looks at what you have supplied, not how the ad has performed. Google weighs things such as:
- How many headlines and descriptions you have written.
- How different they are from each other. Fifteen headlines that say the same thing in different words score poorly.
- Whether some of them include the ad group’s popular keywords.
- How many elements are pinned, since every pin reduces the combinations available.
Alongside the rating, the editor shows suggestions such as “Add more headlines” or “Include popular keywords in your headlines”. After the ad has run, each individual asset gets its own performance rating, which is a separate measure based on results.
Google states that Ad Strength does not directly affect whether an ad serves or its position in the auction. It is a guide to giving the system enough material to work with, not part of Ad Rank.
Why it matters
A responsive search ad learns by trying combinations. An ad with three headlines and two descriptions gives the system very little room; one with twelve distinct headlines gives it far more chances to find the right message for each search. In that sense, a low rating is a fair warning that the ad is under-supplied.
The trap is treating Excellent as the goal. Chasing the rating can push you to remove necessary pins, add keyword-stuffed headlines or drop specific claims that actually convert. A UK financial adviser who must show a particular statement, or a clinic bound by CAP Code rules on health claims, may rightly accept “Average” to keep the ad compliant. What matters is conversions and cost per conversion, not the label.
Common mistakes
- Leaving ads at Poor with only the minimum headlines and descriptions.
- Writing filler headlines just to raise the rating.
- Unpinning a required disclaimer or brand line because the rating dropped.
- Comparing Ad Strength across ad groups as if it measured performance.
- Ignoring the asset performance ratings, which tell you more about what is actually working.
How to act on it
Aim for Good or better on every ad by writing at least ten distinct headlines and four descriptions, with a few headlines reflecting the main keywords. Pin only what must be fixed, and pin more than one option to a position where you can.
For Performance Max, Ad Strength covers the whole asset group: headlines, long headlines, descriptions, images, logos and videos. A missing video or too few images will hold the rating down, and Google may fill gaps with automatically generated assets. Supplying your own images and a short video usually gives you more control over how the brand appears.
A practical way to write a full set is to list the five or six questions a customer asks before buying, then write two headlines answering each one. That produces variety naturally, without padding.
Once the ad has data, focus on results: replace the headlines and descriptions that rarely serve or perform poorly in the asset report, keep the strongest, and judge the ad on conversions. Writing ads that are both well supplied and compliant is part of how I build Google search ad campaigns.