Preview every RSA
combination Google can serve.

Responsive search ads generator: preview every combination before launch

A responsive search ad (RSA) lets you enter up to 15 headlines and 4 descriptions, and Google mixes and matches them into thousands of live variations. This responsive search ads generator shows you the real combinations Google can serve — not a single static example — so you can pin assets, exclude weak ones, and get client sign-off before a budget is ever spent. Below is everything you need to build high-performing RSAs: the exact limits, the combination math, and the best practices that move Ad Strength.

What is a responsive search ad?

A responsive search ad is the default — and now only — text ad format for Google Search campaigns. Instead of writing one fixed ad, you supply a pool of headlines and descriptions, and Google’s machine learning assembles the best-matching combination for each query in real time. Expanded text ads (ETAs) were retired on June 30, 2022, so every new search ad you create today is an RSA.

You provide a minimum of 3 headlines and 2 descriptions, up to a maximum of 15 headlines and 4 descriptions. Google then shows up to 3 headlines and 2 descriptions in any single impression, depending on the device and how crowded the results page is.

How Google assembles RSA combinations

With 15 headlines and 4 descriptions, Google can assemble up to 43,680 unique ad combinations. The system tests them against live queries and favors the combinations predicted to earn the most clicks and conversions — not the order in which you entered your assets.

That flexibility is the whole point of RSAs, but it has a catch: you never see a single “final” ad. Any of those tens of thousands of permutations could appear in front of a customer. Previewing the real combinations — and rotating through them — is the only way to catch a pairing that reads awkwardly, repeats itself, or pushes your strongest message out of view. You can also preview the finished ad on desktop and mobile before it goes live.

Responsive search ad character limits & asset counts

Every RSA asset has a hard character limit, and Google counts spaces and punctuation. Stay inside these limits or your copy will be rejected:

Tip: if a keyword is longer than 30 characters it won’t fit in a headline — work it into a 90-character description instead. Use our free Google Ads character limit checker to validate every asset as you type.

Responsive search ad best practices

The strongest RSAs give Google diverse, high-quality raw material to work with:

• Use 10–15 headlines. More distinct headlines mean more combinations to test. Each should stand on its own — Google may show just one or two on mobile.
• Write 3–4 descriptions. Lead with benefits, add a clear call to action, and avoid repeating what your headlines already say.
• Cover different angles. Mix benefits, features, offers, social proof, and brand. Near-duplicate headlines waste slots and hurt Ad Strength.
• Include your keywords. Work your primary keyword into a couple of headlines so the ad matches the query — but don’t keyword-stuff every slot.
• Keep copy independent. Don’t write a headline that only makes sense next to one specific description; any pairing should read well.

Should you pin headlines and descriptions?

Usually, no. Pinning locks an asset to a fixed position, which removes most of the combinations Google can test. Pinning a single headline eliminates roughly 93% of possible combinations; pinning two eliminates about 99.5%. That kills the machine-learning advantage RSAs are built on.

Pin only when you must — a legal disclaimer, a required brand position, or a compliance line. When you do, pin two or three assets to the same position rather than just one, so Google still has something to choose between. This responsive search ads generator lets you test exactly how pinning or excluding an asset changes what your audience can see.

Ad Strength explained

Ad Strength is Google’s real-time rating of your RSA — Poor, Average, Good, or Excellent — based on the quantity, quality, and diversity of your assets. It isn’t a direct ranking factor, but it’s a useful diagnostic: Google reports that advertisers who improve Ad Strength from “Poor” to “Excellent” see about 12% more clicks and conversions on average.

To raise Ad Strength: add more unique headlines and descriptions, include your keywords, increase asset diversity, and remove unnecessary pins. Aim for at least two RSAs with “Good” or “Excellent” strength in every ad group.

Troubleshooting RSA disapprovals & poor Ad Strength

If a responsive search ad is disapproved, the cause is usually a policy or formatting issue: ALL-CAPS headlines, more than one exclamation point, excessive punctuation, trademark or restricted-content problems, exceeding a character limit, or a broken or non-compliant landing page. Hover the Status column in Google Ads to see the exact policy, fix the asset, and resubmit — or appeal if you believe it’s a mistake.

If Ad Strength is stuck on Poor or Average, you’re usually short on assets or running too many similar ones: add headlines until you have 10–15 distinct angles, write all 4 descriptions, include your keyword, and unpin anything that doesn’t need to be pinned. Then preview the new combinations here before you push the ad live.