Responsive Search Ads (RSAs) help advertisers reach the right people with the right message—by allowing up to 15 headlines and 4 descriptions per ad. Google then tests combinations to find what works best. But how many RSAs can you have in a single ad group?

The answer: 3 active RSAs per ad group. Google limits this to promote quality over quantity. With fewer ads, machine learning can optimize faster and more effectively.

Each RSA must include at least 3 headlines and 2 descriptions, but you can use up to 15 and 4 respectively. Headlines are capped at 30 characters each, and descriptions at 90.

Why it matters:

• You can test many variations without building multiple separate ads

• Google's system rotates combinations based on search intent, device, and performance

• Asset-level reporting shows which messages resonate

Best practices include:

• Grouping related keywords in tightly themed ad groups

• Writing unique, varied headlines and descriptions

• Highlighting unique selling points like discounts or fast shipping

• Using ad extensions for extra visibility

• Monitoring performance and adjusting underperforming assets

RSAs are ideal for campaigns that need dynamic messaging, broad visibility, or fast optimization without manual split testing. Just remember the rule: only 3 responsive search ads per ad group—so make them count.

https://agrowth.io/blogs/google-ads/how-many-responsive-search-ads-in-google-ads