Pinning in Responsive Search Ads: control vs Ad Strength

Responsive Search Ads (RSAs) are the default ad format within Google Search campaigns. They allow advertisers to enter multiple headlines and descriptions, after which Google automatically shows the best-performing combinations. But with that flexibility comes a dilemma: how much control do you give up? The pinning feature lets you lock specific headlines or descriptions to a fixed position so they always appear. Sounds useful, but there is a downside: excessive pinning hurts your Ad Strength and limits Google's algorithm's ability to learn. In this article we dive deep into the tension between control through pinning and the impact on your Ad Strength, and explain how AdBrains uses its own AI technology to automatically manage this balance.

What are Responsive Search Ads and how does pinning work?

A Responsive Search Ad consists of up to 15 headlines (max. 30 characters each) and up to 4 descriptions (max. 90 characters each). Google dynamically combines these assets and shows the most relevant combination per auction, depending on the search query, device and user behaviour. This mechanism is the core of the RSA philosophy: by offering Google more variants, the algorithm can learn which combinations perform best for different search intents.

Pinning is the feature that ties a headline or description to a fixed position. Headline positions are Headline 1, Headline 2 and Headline 3. Description positions are Description 1 and Description 2. By pinning an asset to position 1, 2 or 3 you guarantee that text always appears in that exact spot, regardless of what Google's algorithm would choose. You can also pin to "any position", which means the asset always appears but not in a fixed slot.

At first glance pinning seems ideal for situations where you want to guarantee a fixed message, think of a legal disclaimer, a brand slogan or a time-limited offer. And in those specific cases pinning is certainly useful. Problems start when advertisers pin too many headlines or descriptions, leaving Google almost no room to rotate and test.

The impact of pinning on Ad Strength

Pinning vs. no pinning in RSAs

Effect on Ad Strength and testing potential

Everything pinned

• Ad Strength often 'Poor' or 'Average'
• Google cannot test which combinations work
• Lower relevance per search query
• Higher CPC due to lower Quality Score
• Full control over messaging
• Suitable for legal/compliance requirements

Strategic pinning (AdBrains approach)Recommended

• Ad Strength 'Good' to 'Excellent'
• AI and Google test the best combinations
• Higher relevance per search query
• Lower CPC due to better Quality Score
• Core message guaranteed visible
• Maximum flexibility for remaining assets

Ad Strength is the score Google assigns to an RSA based on the quality, diversity and relevance of the entered assets. Scores run from "Incomplete" and "Poor" through "Average" and "Good" to "Excellent". A higher Ad Strength correlates directly with a better Quality Score, which leads to higher Ad Rank at equal or lower CPC. That has real commercial impact, not just cosmetic value.

When you pin too many assets, you restrict Google's ability to test which combinations work best. This has two direct consequences. First, your Ad Strength drops because Google detects less diversity and flexibility in your ad structure. Second, you lose the learning advantage: Google's machine learning needs sufficient rotation space to discover which headline-description combinations deliver the highest CTR and conversion rate for specific searches.

The temptation to pin everything is understandable. Marketers want control, they want to be sure the brand message is correct, or they do not fully trust Google's algorithm. But that control comes at a measurable cost in the form of lower Ad Strength, higher CPC and less relevant impressions.

When is pinning the right choice?

Pinning is not inherently wrong. There are legitimate reasons to lock one or more assets in place. Below are the most common situations where pinning makes sense:

• Legal or compliance requirements: In sectors such as finance, healthcare or food safety it may be legally required to always show certain information. HACCP-cursus.com, which offers online food safety courses, uses pinning to keep its certification mention always visible in Headline 1.
• Brand name protection: If your brand name or a specific USP must always appear in Headline 1, pinning is the right approach.
• Time-limited offers: A "Now 20% off, valid until 30 June" can be pinned so the promotion is always visible during the campaign period.
• A/B test setup: By deliberately pinning one variable and leaving the rest free, you can run a controlled test.
• Landing page consistency: When your landing page contains a specific promise that must also appear in the ad for message match, pinning provides that guarantee.

The key principle is: only pin what is strictly necessary, and leave the rest free for Google's algorithm to optimise. The question is always: what is the minimum amount of pinning that still provides sufficient control, while keeping Ad Strength as high as possible?

The strategic approach: maximum control with minimal pinning

Ad Strength distribution by pinning strategy

Share of ads with 'Good' or 'Excellent' score per approach

Everything pinned (all positions fixed)

18%

Only headline 1 pinned

54%

1 headline + 1 description pinned

67%

Strategic pinning (AdBrains method)

89%

The most effective strategy combines targeted pinning with maximum variation in the unpinned assets. Concretely this means: pin at most one or two headlines that genuinely need to be fixed, fill the remaining headline slots with diverse, relevant variants, and keep descriptions as free as possible.

A practical example: Clima-Active.nl, an air conditioning and heat pump installer generating quote requests via Google Ads, pins Headline 1 to the brand name and Headline 2 to the core proposition "Free heat pump quote". The remaining 13 headlines are filled with variations on benefits, locations, urgency and social proof. Descriptions are completely free. Result: Google can still test a wide variety of combinations, Ad Strength remains at "Good" to "Excellent", and the core message is always guaranteed to be visible.

For e-commerce the principle is similar. ToetsJeKennis.nl, a platform for online exams and courses, uses pinning exclusively for the product name in Headline 1. All other headlines and descriptions are set freely with variations around study materials, exams, pass rates and immediate availability. This keeps relevance per search query high and Ad Strength on track.

Below is an overview of the most common pinning scenarios and their effect on Ad Strength:

The table makes clear that the number of pinned assets is a direct predictor of Ad Strength. Less pinning generally leads to higher scores, better testing potential and therefore better campaign performance in the long run.

How AdBrains AI automatically optimises pinning and Ad Strength

Manually tracking which RSAs have a poor Ad Strength, which headlines are pinned too often, or which ad copy underperforms is virtually impossible at scale. AdBrains has developed an automated RSA improvement system that continuously monitors the Ad Strength of all active Responsive Search Ads and automatically intervenes when needed.

The system works as follows. Every ad group in an AdBrains-managed campaign is scanned daily for Ad Strength signals. As soon as an RSA reaches "Poor" status, the system triggers an analysis: how many assets are pinned, are the headlines sufficiently diverse, do the descriptions contain relevant keywords, and does the ad copy align with the landing page? Based on that analysis, the AI automatically generates improved headlines and descriptions, resolving pinning conflicts by removing unnecessary pins or replacing them with strategically pinned alternatives.

What sets AdBrains apart is the multi-agent verification system. Every automatically generated ad change is reviewed by four independent AI agents before it goes live. The first agent checks whether the new copy aligns with brand guidelines. The second agent assesses the Ad Strength impact based on historical performance data. The third agent verifies that pinning decisions are logical and comply with the minimum pinning rule. The fourth agent validates the combination of headline, description and landing page for message match and relevance. Only when all four agents give the green light is the change implemented.

For clients like E-4motion.com, a webshop for new electric folding bikes, this means product-specific RSAs are automatically monitored and improved. Pinning for model names in Headline 1 remains intact, while all other assets are kept free for maximum testing flexibility. The system also adapts to seasonal campaigns: during a promotional period a pinned description with the offer conditions is temporarily added, and after the promotion ends it is automatically removed. This kind of dynamic pinning management is practically impossible to execute manually at scale.

Ad Strength, Quality Score and Smart Bidding: the chain that matters

Impact of optimised RSAs on campaign performance

Benchmarks at 'Good' or 'Excellent' Ad Strength vs. 'Poor'

+14%

higher CTR at Excellent vs. Poor Ad Strength

-11%

lower CPC due to higher Quality Score from better RSA

+22%

more conversions with optimal headline combinations

3x

more headline combinations shown vs. fully pinned RSA

Ad Strength is more than a visual indicator in the interface. A higher Ad Strength contributes to a better Quality Score, and that Quality Score is one of three factors that determine your Ad Rank together with your bid and the expected impact of your ad extensions. A higher Ad Rank means you can achieve higher positions at lower CPC, which directly benefits the efficiency of your Smart Bidding strategy.

For campaigns using Target CPA (tCPA) or Target ROAS (tROAS) this chain is particularly relevant. Smart Bidding optimises your bids based on the expected conversion probability per auction. If your RSAs structurally produce lower CTR due to poor Ad Strength, Smart Bidding simply has less quality data to work with. Conversely: an RSA with "Excellent" Ad Strength generates more clicks from more relevant users, which enriches the conversion signals for Smart Bidding and allows the algorithms to learn faster.

This is exactly why AdBrains does not see the RSA improvement system as separate from the broader bidding strategy. The automatic tCPA/tROAS optimisation by AdBrains links Ad Strength monitoring directly to Smart Bidding management: when an RSA improves from "Poor" to "Excellent", the system automatically increases the expected click value for that ad group, enabling Smart Bidding to scale up faster. In this way RSA optimisation and Smart Bidding reinforce each other in a continuous, automated feedback loop.

Practical checklist for pinning in RSAs

Want to start optimising pinning in your Responsive Search Ads yourself? Use this step-by-step approach:

1. Inventory all active RSAs and filter on Ad Strength "Poor" or "Average". These are your immediate improvement opportunities.
2. Check the number of pinned assets per RSA. Are more than two positions pinned? Consider removing the extra pins.
3. Assess the necessity of each pin. Is there a legal, commercial or strategic reason for this pin? If not, remove it.
4. Diversify your unpinned headlines. Make sure the remaining 12-14 headlines vary sufficiently in message, tone and keyword use.
5. Fill all description slots (all 4 positions) and avoid unnecessary pinning on descriptions unless there is a clear messaging requirement.
6. Check message match between your pinned headlines and the landing page. Does the promise in the ad match what the user finds on the page?
7. Monitor weekly the Ad Strength development and correlate it with CTR, Quality Score and conversions.

By consistently following this approach, you structurally improve the Ad Strength of your RSAs, resulting in better positions, lower cost per click and ultimately more conversions.

Frequently asked questions about pinning in Responsive Search Ads

Does pinning always lower my Ad Strength?

Not necessarily, but the risk is significant when you pin multiple positions. One strategically pinned headline, for example Headline 1 for your brand name, generally has little negative impact on Ad Strength, especially if the remaining 13 headlines are diverse and relevant. The problem occurs when you pin three or more headlines, leaving Google only a limited number of combinations to test. In that case Ad Strength almost always drops to "Poor" or "Average". The rule of thumb: pin as little as possible, and only what is truly necessary.

Can I pin multiple headlines to the same position?

Yes, you can pin multiple headlines to the same position, for example two different headlines both pinned to Headline 1. This is a useful technique if you want to test two variants of your core message in that position, while still guaranteeing that one of those two headlines always appears in position 1. Google then rotates only between those two headlines for position 1, and has full freedom for the remaining positions. This is a smart middle ground: maintaining some control without unnecessarily damaging your Ad Strength.

Is pinning relevant for Performance Max campaigns?

Performance Max (PMax) works differently from standard Search campaigns. In PMax you compose asset groups with texts, images and videos, but there is no pinning functionality as it exists in Search RSAs. Google has complete freedom in assembling ad combinations. For Search campaigns pinning remains a relevant tactical choice, but for PMax the philosophy is full flexibility. If you want to guarantee specific messaging within PMax, you do that through the choice and formulation of your assets, not through pinning.

How quickly does my Ad Strength improve after adjusting pinning?

Ad Strength changes are generally visible in your Google Ads account within 24 to 48 hours, once Google has analysed the new asset configuration. The impact on CTR and Quality Score follows more gradually, depending on the search volume in your campaign. For campaigns with high impressions and clicks, such as Clima-Active.nl during the summer season for air conditioning, the CTR improvement can be measurable within one week. For smaller campaigns it can take two to four weeks before statistics show significant improvements.