Responsive Search Ads Best Practices for 2026

Responsive search ads (RSAs) are now the default ad format in Google Ads, and for good reason — they give Google's machine learning the flexibility to test thousands of headline and description combinations automatically. But that flexibility is a double-edged sword. Without a thoughtful strategy, you end up with ads that feel disjointed, off-brand, or irrelevant. This guide covers the RSA best practices that actually move performance in 2026.

How Responsive Search Ads Work

RSAs allow you to provide up to 15 headlines and 4 descriptions. Google then tests different combinations to find the best-performing pairings for each search query, device, and audience. Over time, the algorithm learns which combinations drive the highest click-through and conversion rates.

The key difference from the old expanded text ads (ETAs) is that you do not control exactly which headlines appear together. This makes asset quality and strategic pinning essential.

Asset Quantity and Quality

How Many Assets to Provide

Google recommends providing the maximum number of assets, but more is not always better if quality suffers. Here is what we recommend at Spires Digital:

• Headlines: Provide 11-15 unique headlines. Below 10 limits Google's testing ability. Above 10 gives meaningful variety.
• Descriptions: Provide all 4 descriptions. Each should highlight a different selling point.

Asset Diversity Framework

Spread your headlines across these categories to ensure Google has variety to work with:

• Keyword-focused (3-4 headlines): Include primary keywords for relevance and Quality Score
• Benefit-focused (3-4 headlines): Highlight outcomes like "Increase Revenue by 40%"
• Social proof (2-3 headlines): "Trusted by 200+ UK Brands" or "5-Star Rated Agency"
• CTA-focused (2-3 headlines): "Get Your Free Audit" or "Book a Strategy Call"
• Differentiator (1-2 headlines): "No Long-Term Contracts" or "Dedicated Account Manager"

Pin Strategies That Work

Pinning forces a specific headline or description to always appear in a particular position. Used sparingly, pinning ensures your most important messages are always visible. Overused, it defeats the purpose of RSAs.

When to Pin

• Brand name: Pin to headline position 1 if brand awareness is important
• Legal disclaimers: Pin required disclosures to ensure they always show
• Primary keyword: Pin one keyword-rich headline to position 1 or 2 for relevance

When Not to Pin

• Do not pin all three headline positions — this eliminates Google's ability to test
• Do not pin a single headline to a position — pin 2-3 options to the same position to maintain testing flexibility
• Avoid pinning descriptions unless legally required

If you pin a single headline to each position, you have essentially recreated an expanded text ad with none of RSA's benefits. The ideal approach is to pin 2-3 headlines to position 1 (ensuring your best messages always lead) while leaving positions 2 and 3 unpinned.

Writing Headlines That Work in Any Combination

The biggest RSA mistake is writing headlines that only make sense as a sequence. Since Google combines them randomly, every headline must work alongside any other headline.

Avoid Redundancy

If three of your headlines say essentially the same thing — "Expert PPC Management," "Professional PPC Services," "Top PPC Agency" — Google is choosing between three weak variations instead of testing genuinely different messages. Write headlines that each contribute a unique piece of information.

For more on writing effective ad copy, see our guide on Google Ads copy that converts.

Asset Reporting and Performance Analysis

Google rates each asset as Learning, Low, Good, or Best based on its relative performance. Use these ratings to guide your optimisation:

• Best: Keep these assets and create variations that explore similar angles
• Good: Maintain these — they are performing above average
• Low: Replace after the asset has had sufficient impressions (at least 5,000)
• Learning: Wait — Google needs more data before making a judgment

Combination Reports

Beyond individual asset ratings, check the Combinations report to see which specific headline-description pairings Google shows most often. This reveals what the algorithm considers your best messaging and can inform your broader marketing copy.

Testing Approach for RSAs

Testing RSAs requires a different approach than testing the old ETAs. You cannot simply A/B test two complete ads because the combinations within each RSA are already being tested internally.

Recommended Testing Framework

• Run one RSA per ad group to give it maximum data
• Test different themes rather than individual headlines — create two RSAs with fundamentally different angles (e.g., price-focused vs. quality-focused)
• Allow at least 30 days and 100+ conversions before evaluating results
• Use Google's ad variation experiments for controlled testing at scale

Review asset performance alongside broader campaign metrics. A headline rated "Best" in a campaign with poor conversion rates might be driving clicks that do not convert. Always tie asset performance back to Quality Score and conversion data.

Optimising RSAs for Negative Keywords

Your negative keyword strategy directly impacts RSA performance. If irrelevant search terms trigger your ads, Google's machine learning receives noisy data that reduces its ability to optimise headline combinations effectively. Run regular search term reports and maintain comprehensive negative keyword lists to keep your RSA data clean.

RSA Ad Strength Score

Google assigns an Ad Strength rating from Poor to Excellent. While this metric is directional, do not treat it as a performance indicator. An "Excellent" Ad Strength does not guarantee high performance — it simply means you have provided enough diverse assets for Google to test.

Focus on actual performance metrics — conversion rate, cost per conversion, and ROAS — rather than chasing a perfect Ad Strength score.

Frequently Asked Questions

Responsive search ads reward advertisers who combine creative thinking with disciplined testing. If you want help building RSAs that consistently outperform, get in touch with Spires Digital or book a free strategy call via Calendly — we will review your current ads and identify quick wins to improve performance.