Free Google Ads RSA Builder & Preview

Free Google Ads RSA builder & preview

Responsive Search Ads (RSAs) are the default ad format in Google Ads — you supply up to 15 headlines and 4 descriptions, and Google mixes and matches them to each searcher. This free tool — built by a Singapore Google Ads agency — enforces the exact character limits (30 for headlines, 90 for descriptions, 15 per URL path), shows a live Google-style preview of how your ad could appear, and runs a best-practice checklist so you ship a strong ad the first time. Everything stays in your browser.

RSA character limits at a glance

Google is strict: headlines max out at 30 characters and descriptions at 90 characters, counted including spaces and punctuation. Emoji and most special characters are disallowed. Each of the two optional display-URL paths is capped at 15 characters. Anything over the limit is simply rejected on upload, so the live counters above turn red the moment you cross a limit — fix them before you paste into the Ads editor.

How many headlines and descriptions should you write?

The minimum is 3 headlines and 2 descriptions, but Google’s own guidance — and every performance study — favours giving the system more raw material. Aim for at least 8–10 distinct headlines and all 4 descriptions, covering different angles: your core offer, a benefit, social proof, a location signal (“Singapore”), a call to action, and a price or promotion. More non-repetitive assets give Google’s machine learning more combinations to optimise, which typically lifts Ad Strength and click-through rate.

Writing RSAs that convert — a Singapore checklist

Include your primary keyword in at least two headlines (relevance drives Quality Score). Add a local signal — “Singapore”, a neighbourhood, or “.sg” — to pre-qualify clicks and cut wasted spend from outside your market. Make at least one headline a clear call to action (“Get a Free Quote”, “Book a Consultation”). Avoid near-duplicate headlines: Google won’t show two that are too similar, so variety beats repetition. Finally, match the ad to the landing page — the strongest RSA still fails if the page it points to doesn’t deliver on the promise.

Feeding the algorithm useful variety, not filler

Responsive Search Ads work by mixing and matching your headlines and descriptions, so the assets you supply need to be genuinely different from one another — not fifteen rewordings of the same claim. Give Google real angles to test: one headline leads on price, another on speed, another on a trust signal like years in business or a client count, another on the specific service, and one on a call to action. If several headlines say almost the same thing, the algorithm has nothing meaningful to optimise between, and you waste impressions learning what you already knew.

A frequent mistake in the Singapore market is stuffing every headline with “Singapore” or “SG”. Because any of your headlines can appear together, three location-heavy headlines can surface as “SEO Services Singapore — Singapore SEO Agency — Best SEO Singapore”, which reads as clumsy repetition. Localise once or twice, then use the remaining slots for differentiated benefits. If you want a second pair of eyes on the full account structure, our Google Ads team reviews campaigns weekly.

How your ad works with everything around it

An RSA rarely appears alone. It sits above sitelinks, callouts, structured snippets and often a price or location extension, so write your assets to complement those rather than duplicate them. If a callout already says “Free Consultation”, don’t burn a headline on it — use that space for something the extensions can’t say. The strongest ads treat the whole SERP unit as one message.

Match the ad to the landing page it points to as well. Google rewards message consistency through Quality Score, and users convert better when the headline they clicked reappears near the top of the page. If your ad promises “Same-Day Quotes”, the landing page should confirm it within the first screen. This alignment between ad copy and page — often built with a purpose-made landing page — usually moves conversion rate more than any single headline tweak. You can sanity-check the maths afterwards with our conversion rate calculator.

Frequently asked questions

How many characters can a Google Ads headline be?

30 characters, including spaces. Descriptions allow 90 characters, and each of the two display-URL paths allows 15. This tool counts live and flags anything over the limit.

How many headlines does Google actually show?

Usually two or three headlines and one or two descriptions per impression, chosen and ordered dynamically. That’s why the preview shows up to three headlines joined by separators — but every asset you add can appear in some combination.

What is Ad Strength and does it matter?

Ad Strength is Google’s quality rating (Poor to Excellent) based on the number, variety and relevance of your assets. It isn’t a direct ranking factor, but ads rated Good or Excellent tend to earn more impressions and better performance, so it’s a useful proxy to optimise toward.

Can I pin headlines to specific positions?

Yes, in Google Ads you can pin an asset to position 1, 2 or 3 — useful for legal disclaimers or a must-show brand name. Use pinning sparingly, though: over-pinning removes the combinations Google can test and usually lowers Ad Strength.

Should I reuse the same RSA across multiple ad groups?

No — each ad group should target a tight theme of keywords, and the RSA should speak directly to that theme. Reusing one generic ad everywhere dilutes relevance and drags down Quality Score. Duplicate the structure by all means, but rewrite the headlines so they echo the specific search intent of each group.

How long before I judge an RSA’s performance?

Give it enough conversions to be statistically meaningful rather than a fixed number of days — typically a few weeks and at least 15–30 conversions for a lower-volume account. Judging too early on raw click-through rate tempts you to kill variants before the algorithm has finished learning which combinations actually drive sales.