Google Ads Responsive Search Ads: How to Write 15 Headlines That Give the Algorithm Real Choices

The short answer: a responsive search ad works best when its 15 headlines are 15 genuinely different messages, not 15 rewordings of one sentence. Google combines your headlines and descriptions automatically, so every headline must make sense next to any other. Write for variety in angle, keep the offer consistent and use pinning only where legal or brand rules demand it.

Responsive search ads, usually shortened to RSAs, are the standard text ad format in Google Ads. Many small accounts we audit have an RSA with a handful of near-identical headlines, a “Poor” or “Average” ad strength rating, and no idea which messages actually work. This guide shows how to write a full set and review it without drowning in data.

How do responsive search ads work?

You supply up to 15 headlines (30 characters each) and up to four descriptions (90 characters each). Google tests combinations and shows up to three headlines and two descriptions per impression, picking the combination it predicts will perform best for that search. You do not control which combination appears unless you pin assets to positions.

That has two consequences. First, every headline has to stand alone and in company: a headline that says “Free Shipping Today” does not work if another says “Book a Free Call”. Second, variety gives the system something to learn from. Fifteen near-duplicates give it nothing.

The seven angles to cover in your headlines

We build each RSA from a short list of angles, then write two headlines per angle. This gives 14 or 15 distinct headlines without padding.

Only include claims you can back up. Do not put a price, a year or a certification in an ad that is not true or that your landing page does not confirm. Google can disapprove misleading claims, and visitors who feel misled leave.

How do you write headlines that survive recombination?

Because headlines can appear in any order, use these rules.

1. Avoid sentences that continue across headlines. “We Help You” followed by anything may not read well. Write each headline as a complete phrase.
2. Do not repeat the same word in every headline. If all headlines include “cheap”, the system has no variety to work with and the ad looks spammy.
3. Keep the offer consistent. If one headline says “20% Off” and another says “Free Trial”, the user may see both and be confused. Pick one main offer.
4. Mix lengths. Use short punchy headlines and some that use most of the 30 characters.
5. Check them in pairs. Read three random headlines in a row, aloud. If the sequence sounds broken, rewrite.

What should the descriptions do?

Headlines get attention; descriptions close the gap between the click and the promise. Write four that each do something different: one explains what you do and for whom, one handles an objection such as price or time, one adds proof, one gives the next step. Keep claims specific. “We reply to every enquiry within one working day” beats “Great customer service”.

Should you pin headlines?

Pinning locks an asset to a position, which reduces the combinations Google can test. Use it sparingly. Reasonable uses are:

• A legal disclaimer or brand name that must appear in position one.
• A main keyword headline you want shown first for relevance.

If you pin, pin at least two or three headlines to the same position so the system still has choices. Pinning everything turns an RSA into an old-style fixed ad and removes the benefit.

What does ad strength actually tell you?

Ad strength is a rating (Poor, Average, Good, Excellent) based on factors such as number of assets, uniqueness and keyword inclusion. It is a guide to completeness, not a prediction of profit. We have seen “Excellent” ads that attract the wrong clicks and “Good” ads that bring in lots of customers. Use it to catch obvious omissions, such as only five headlines, but do not tune your ad to chase the rating at the cost of clarity. If your ad is stuck at Average because you refuse to write an irrelevant headline just to add variety, that is acceptable.

How do you review which messages work?

Open the ad’s asset details. Google labels assets with performance ratings such as Low, Good and Best once enough data has accumulated. Labels need volume; with small budgets, you may wait several weeks before seeing them.

A practical routine is:

1. Wait for at least a few hundred impressions per asset, ideally more.
2. Replace headlines labelled Low after they have had a fair chance, and swap in a new angle, not a reworded version of the same angle.
3. Look at the combinations report to see which pairs are shown most often.
4. Judge success on conversions and cost per conversion, not on click-through rate alone.

This links to our wider advice on creative testing cadence: change a little, measure patiently, and keep a log of what you swap.

How do RSAs connect to Quality Score and landing pages?

The ad is one of three components behind expected click-through rate, ad relevance and landing page experience. Writing headlines that echo the searcher’s words helps relevance; landing pages that repeat the promise help the third part. We unpack the practical fixes in Google Ads Quality Score in 2026.

The search terms behind your ad also matter. If irrelevant queries trigger the ad, no headline will save the account. Pair this work with a regular review of the search terms report and a solid starter negative keyword list.

Should small accounts use more than one RSA per ad group?

With small budgets, one strong RSA per ad group is usually enough, and two is the practical maximum. Each extra ad splits scarce impressions, which slows the learning you are trying to get. Add a second ad only when you want to test a clearly different approach, for example a price-led message against a trust-led one, and give it the same ad group and the same landing page so the comparison is fair. After a few weeks, pause the weaker one on conversion data, not on click-through rate. Keep the winner’s best headlines and reuse them in the next test; over a few rounds the ad improves through accumulation rather than through guesswork.

Finally, remember that RSAs are only one part of what people see. Sitelinks, callouts and structured snippets add extra lines of text below the ad and take up more of the results page. Fill those in with the proof points and offers that did not fit into the headlines, and you widen your message without crowding the core ad.

Common mistakes to avoid

• Writing 15 headlines that all say “Best Accountant in Town”.
• Adding keyword stuffing to reach Excellent strength.
• Pinning every asset.
• Rewriting the whole ad every week, so no asset ever collects enough data.
• Sending the click to a page that does not mention the headline’s promise.
• Using claims the page cannot verify, such as “No. 1” or “guaranteed results”.

A 45-minute workshop template

Block three quarters of an hour. Spend ten minutes listing your genuine differentiators, ten minutes writing two headlines per angle from the table above, ten minutes drafting four descriptions, ten minutes checking claims against your landing page, and five minutes uploading and setting any necessary pins. Put a reminder in the calendar six weeks later to review the asset ratings. That one session usually beats months of occasional tweaking, because it replaces a single repeated message with a real test.