Responsive Search Ads

Paid Media

Also: RSA · RSAs

What it isGoogle's flexible search ad format

You provideMultiple headlines and descriptions

Google doesMixes and tests combinations

Only format nowExpanded text ads are retired

Quick definition

Responsive Search Ads (RSA) are the standard Google Ads search ad format. You supply up to 15 headlines and 4 descriptions, and Google's algorithm assembles and tests different combinations for each search, learning which pairings perform best for a given query and searcher.

How it varies across Australia

Ad strength ratings across Australian accounts skew lower than Google's own guidance suggests is achievable. Most advertisers stop adding headline variety once they hit 'Good' and never chase 'Excellent', leaving click-through rate and quality score gains unclaimed.

See paid media performance across Australian industries →

What it actually means

Responsive Search Ads changed the unit of work in search advertising. You used to write one ad. Now you write ingredients and Google assembles the meal.

You provide up to 15 headlines and 4 descriptions. Google's machine learning tests combinations across different queries, devices and audiences, then leans into whatever combination gets the best click-through rate and conversion rate for that specific search. Expanded text ads, the old fixed-headline format, were fully retired by Google, so RSAs aren't an option anymore. They're the format.

This shifts what good copywriting looks like. Instead of nailing one perfect sentence, you're writing a pool of headlines that each stand alone, cover different angles (price, urgency, social proof, feature), and don't rely on a neighbouring headline for context. Bidding strategy, quality score and conversion rate all interact with how well that pool is built. A tight cluster of near-identical headlines gives Google nothing to differentiate. A messy pool with unrelated angles confuses the algorithm just as much.

The practical skill is writing variety with intent, not writing more for the sake of hitting the character limit.

RSAs didn't replace copywriting. They replaced the illusion that you knew which line would win before the data told you.

How it shows up

RSAs show up in the Google Ads interface as the ad strength meter (Poor, Average, Good, Excellent) sitting above your headline and description fields. They also show up in the asset performance report, where Google labels each headline and description as Low, Good or Best performing, based on impressions served in each combination.

In reporting, RSA performance shows up indirectly through click-through rate, conversion rate and quality score shifts after a headline refresh, since Google doesn't expose exact combination-level conversion data.

Where people get this wrong

Writing near-duplicate headlines to fill all 15 slots.Google's algorithm needs genuine variation to learn from. Ten versions of the same phrase give it nothing new to test against real search intent.

Pinning most headlines to fixed positions.Pinning locks a headline into a specific slot and removes it from testing. Overuse turns a responsive format back into a rigid one and kills the format's core advantage.

Chasing 'Excellent' ad strength as the end goal.Ad strength measures variety and best practice adherence, not actual conversion rate. An 'Excellent' rated ad can still underperform a 'Good' one that matches search intent better.

Common questions

How many headlines and descriptions should I write for an RSA?

Aim to fill all 15 headline slots and all 4 description slots with genuinely distinct angles. Google needs variety to learn from. Partial headline pools give the algorithm fewer combinations to test and slow down performance gains.

What does pinning a headline do?

Pinning locks a specific headline or description into a fixed position, like position one, so it always appears there. It's useful for legal disclaimers or brand names that must appear, but overusing it turns the ad back into a static format and blocks Google's testing.

Is ad strength the same as ad performance?

No. Ad strength measures how much variety and best practice you've built into the asset pool. Performance is measured by click-through rate, conversion rate and cost metrics. A high ad strength score doesn't guarantee strong results, it just means Google has more to test with.

Can I still use expanded text ads?

No. Google fully retired expanded text ads, the older fixed-headline format. Responsive Search Ads are now the only standard search ad format available in Google Ads, alongside call ads and other specialised formats.

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About New Rebellion

New Rebellion is a marketing intelligence consultancy. We build tools, score Australian businesses on how their marketing actually performs, and publish Debrief every day. This dictionary is part of how we work in the open.

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