What are responsive search ads (RSA)

Agility is the defining factor of a high-performance digital strategy. As user search behaviour becomes increasingly varied and complex, static adverts often fail to capture the nuances of every query. Responsive Search Ads (RSA) have become the gold standard for search campaigns, offering a flexible, machine-learning-driven approach to ensure your message always resonates with your target audience.

What are responsive search ads in Google Ads

Responsive Search Ads are Google’s primary search ad format, designed to adapt to the specific needs and search terms of individual users. Unlike the legacy static formats, RSAs allow you to provide multiple headlines and descriptions for a single advert.

Google’s machine learning then takes these assets and dynamically assembles them into combinations that are most likely to perform well for a particular search query. This means that two different users searching for the same product might see slightly different versions of your advert, each tailored to their perceived intent and browsing history.

How do responsive search ads work

The mechanics of RSAs rely on "asset-based" advertising. Rather than writing one fixed advert, you provide a pool of content. When a search is triggered, Google’s algorithms test various combinations of these headlines and descriptions to identify which pairings yield the best results over time.

This process—often referred to as automated testing—removes the guesswork from A/B testing. By analysing performance data in real-time, Google prioritises the combinations that achieve the highest click-through rates (CTR) and conversion rates. This ensures your Google Ads account is as efficient as possible, especially when used in tandem with other automated formats like Performance Max.

How do I write effective responsive search ads

Writing for an RSA requires a shift in mindset. Because headlines and descriptions can be shown in any order, each asset must be able to stand alone while also making sense when combined with others. To write effective RSAs, consider the following:

• Focus on uniqueness: Avoid repetitive headlines. Each asset should highlight a different benefit, feature, or call to action.

• Incorporate high-value keywords: Ensure your primary keywords appear in at least a few of your headlines to maintain high ad relevance.

• Highlight value propositions: Use your descriptions to detail specific offers, UK-based expertise, or unique selling points that differentiate you from competitors.

• Clear calls to action: Every combination should lead the user toward a clear next step—whether that is "Enquire today" or "Download our guide."

Weighing the advantages and disadvantages of RSAs

As with any automated tool, it is essential to understand both the benefits and the potential drawbacks of relying on machine learning for your ad copy.

The advantages

• Increased reach: By providing multiple assets, your adverts are eligible to compete in more auctions and match with a wider variety of search terms.

• Performance optimisation: Google’s algorithms naturally favour combinations that perform well, often leading to a higher CTR compared to static adverts.

• Time efficiency: You no longer need to manually manage dozens of A/B tests; the system handles the testing and optimisation on your behalf.

• Improved relevance: Users receive a more tailored experience, which is particularly beneficial in the B2B sector where search intent can be highly specific. As seen in our work with ScriptRunner, where tailored paid activity drove meaningful engagement, demonstrating relevancy is the quickest way to improve campaign performance.

The disadvantages

• Reduced control: Unless you use pinning, you cannot control exactly which headline appears with which description.

• Reporting limitations: While you can see impression data for assets, you cannot see the exact conversion data for every individual combination served.

• Brand consistency risks: Without careful planning, some combinations may feel slightly repetitive or less cohesive than a hand-crafted static ad.

What are best practices for optimising responsive search ads

To get the most out of your RSAs, you should treat them as a continuous work in progress rather than a "set and forget" task.

• Monitor Ad Strength: Google provides an "Ad Strength" rating (from Poor to Excellent). Aim for "Good" or "Excellent" by providing the maximum number of unique assets.

• Use Pinning Sparingly: You can "pin" headlines to specific positions, but doing so limits the machine learning's ability to test combinations. Only pin when strictly necessary for legal or brand consistency reasons.

• Review Asset Performance: Periodically check the "Asset details" report to see which headlines are receiving the most impressions and which ones might need to be replaced.

• Check your tracking: Ensure your campaigns are supported by robust data by understanding what is Google Ads auto-tagging and how to use it, as this is vital for accurate performance analysis.

How many headlines and descriptions should I use in responsive search ads

To give the algorithm enough data to work with, you should aim to provide the maximum number of assets allowed:

• Headlines: You can provide up to 15 headlines. We recommend using at least 10–12 to ensure sufficient variety.

• Descriptions: You can provide up to 4 descriptions. You should always use all four to allow Google to test different ways of expanding on your headlines.

The more high-quality assets you provide, the more opportunities Google has to find the winning combination for every search query. To assist with your planning, you can download our Responsive Search Ad Template to structure your assets before implementation.

When should I use responsive search ads vs expanded text ads

As of June 2022, Expanded Text Ads (ETAs) can no longer be created or edited. While existing ETAs may still run, RSAs are now the only responsive and supported format for new search campaigns.

The transition from ETAs to RSAs represents a move toward automation and scale. While ETAs offered total control over the exact sequence of words, RSAs offer superior reach and performance by adapting to the billions of searches conducted every day. If your current campaigns still rely heavily on legacy ETAs, it is time to transition your strategy to focus on asset variety and machine learning to ensure your business remains competitive.

If you are ready to scale your search performance and need expert guidance, get in touch with the team at Brew Digital today.