Responsive Search Ads (RSA)

Responsive Search Ads (RSAs) are the standard ad format for Google Search campaigns, allowing advertisers to provide up to 15 headlines and 4 descriptions. Google’s AI then tests different combinations and automatically serves the variations most likely to perform well for each individual search query and user context.

Key Takeaways

• RSAs are the only creatable search ad format since June 2022 (ETAs can no longer be created)
• Provide up to 15 headlines (30 characters each) and 4 descriptions (90 characters each)
• Google tests combinations and optimizes toward the best-performing variations
• Pin headlines or descriptions to specific positions when messaging control is essential
• Ad Strength indicator rates your RSA from “Poor” to “Excellent” based on asset variety

What Are Responsive Search Ads

Responsive Search Ads replaced Expanded Text Ads as Google’s primary search ad format. Instead of writing a single static ad, you provide Google with a pool of headlines and descriptions. Google’s machine learning then assembles the most effective combination for each auction based on the search query, device, browsing history, and other signals.

Each RSA can show up to 3 headlines and 2 descriptions at a time:

Component	Max Provided	Shown Per Impression	Character Limit
Headlines	15	Up to 3	30 characters each
Descriptions	4	Up to 2	90 characters each
Display URL paths	2	2	15 characters each
Final URL	1	1	Full URL

How It Works

The RSA system operates through a continuous testing loop:

1. Asset input — you write 10-15 unique headlines and 3-4 descriptions covering different value propositions, features, calls to action, and keyword variations
2. Combination testing — Google creates combinations from your assets (15 headlines x 4 descriptions = thousands of possible variations)
3. Auction-time assembly — for each search, Google selects the combination most likely to resonate based on the query, user profile, and device
4. Performance learning — over time, Google identifies which assets and combinations drive the best results and favors them in future auctions
5. Reporting — the asset detail report shows impressions and performance ratings (Low, Good, Best) for each individual headline and description

Pinning allows you to lock specific headlines or descriptions to positions (Headline 1, Headline 2, Headline 3, Description 1, Description 2). This ensures critical messaging always appears but reduces Google’s optimization flexibility. Use pinning sparingly — only for legal disclaimers, brand names, or mandatory offers.

Practical Example

A home insurance company creates an RSA with the following assets:

Headlines: (1) Affordable Home Insurance, (2) Get a Free Quote Today, (3) Coverage Starting at $29/Month, (4) Trusted by 500,000 Homeowners, (5) Compare Plans in 2 Minutes, (6) Bundle Home & Auto - Save 15%, (7) No Hidden Fees or Deductibles, (8) 24/7 Claims Support, (9) A-Rated Financial Strength, (10) Switch & Save Up to $600/Year, (11) Customizable Coverage Options, (12) Home Insurance Made Simple

Descriptions: (1) Get comprehensive home insurance coverage at competitive rates. Compare plans online and get a quote in minutes., (2) Protect your home with a policy tailored to your needs. Award-winning claims service and flexible payment options., (3) Join 500,000 homeowners who trust us for reliable coverage. Switch today and start saving., (4) Bundle your home and auto insurance for maximum savings. Free online quotes with no obligation.

After 30 days, the asset report shows:

Asset	Performance Rating	Impressions
”Get a Free Quote Today” (H)	Best	18,400
”Coverage Starting at $29/Month” (H)	Best	16,200
”No Hidden Fees or Deductibles” (H)	Good	9,800
”Home Insurance Made Simple” (H)	Low	2,100
Description 1	Best	22,000
Description 3	Good	14,500

Action: replace “Low” performing headline with a new variation and monitor for another 30 days.

Why It Matters

RSAs fundamentally change how advertisers approach ad creation. Instead of guessing which single message will work best, you provide a range of options and let Google’s AI determine the optimal combination per auction. This means your ads can dynamically adapt — showing price-focused headlines to bargain searchers and trust-focused headlines to comparison shoppers.

The most effective RSAs contain diverse, distinct headlines that cover different selling angles rather than minor variations of the same message. Each headline should be able to stand alone and make sense paired with any other headline. Review asset performance reports monthly, replace underperforming assets, and maintain a full roster of 10-15 headlines to give Google maximum flexibility. Strong RSAs are the foundation of Search campaign performance and directly influence your Ad Strength score.