Google Ads Ad Copy: How to Write Ads That Convert

A Google Ads ad gives you 30 characters per headline and 90 per description. That's all you have to convince a stranger to click on you instead of the 3 competitors displayed right above or below.

Every word counts. Every headline is a test. And the difference between a mediocre ad and a high-performing one is often 2x more clicks — and 2x more leads for the same budget.

The Anatomy of a Responsive Search Ad (RSA)

Google retired classic text ads in 2022. Today, the only Search format available is RSA (Responsive Search Ad).

An RSA contains:

• 15 headlines of 30 characters max each
• 4 descriptions of 90 characters max each
• Display URL with 2 paths of 15 characters each

Google automatically combines your headlines and descriptions to create variants, then tests the best-performing combinations. Your job: provide 15 varied and impactful headlines, not 15 rephrasing of the same idea.

The 7 Headline Categories to Cover

To give Google enough material to test, cover these 7 angles:

1. Exact keyword (3 headlines)

The primary keyword and its close variants. This is the foundation of relevance. When users see their keyword in the headline, CTR goes up.

• "Google Ads Agency in Austin"
• "Certified Google Ads Expert"
• "Outsourced Google Ads Management"

2. Concrete benefit (3 headlines)

What the customer gets. Not a feature — a result.

• "Double Your Leads in 90 Days"
• "+312% Average ROI"
• "Cut Your CPA by 40%"

3. Social proof (2 headlines)

Numbers that prove your credibility.

• "15 Years of Google Ads Experience"
• "500+ Businesses Served"

4. Direct CTA (2 headlines)

The action you want the user to take.

• "Get Your Free Audit"
• "Quote in 24h — No Commitment"

5. Urgency/specificity (2 headlines)

The detail that creates urgency or specificity.

• "Limited Spots This Month"
• "Free 30-Min Diagnostic"

6. Differentiation (2 headlines)

What separates you from the competition.

• "Tracking Through to Signed Contract"
• "No Lock-In — Measured Results"

7. Geographic/contextual (1 headline)

For local campaigns.

• "Google Ads Agency in "

Descriptions That Convert

All 4 descriptions must work independently. Google may only show one, or two.

Ideal description structure

Sentence 1: The problem or benefit — hook attention. Sentence 2: The proof or method — reinforce credibility. Sentence 3: The CTA — tell them what to do.

Example: "Spending too much on Google Ads? Our clients reduce their CPA by 35% on average within the first quarter. Book your free diagnostic today."

The 4 descriptions to write

1. Benefit-oriented — concrete results, numbers
2. Method-oriented — how you work, your unique approach
3. Trust-oriented — testimonials, certifications, years of experience
4. Action-oriented — specific offer, strong CTA, urgency

Pinning Strategy

Pinning forces a headline to appear in a specific position (position 1, 2, or 3). It's a powerful tool but should be used sparingly.

When to pin

• Pin the main keyword in position 1 — this guarantees relevance with the search
• Pin the CTA in position 3 — this ensures a call to action is always visible

When not to pin

• Don't pin more than 2 positions — Google needs freedom to test combinations
• Don't pin social proof headlines in position 1 — the keyword should come first
• If your CTR is good without pinning, don't touch anything

Pro tip: multi-pinning

You can pin 2–3 different headlines to the same position. Google picks the best among those options. This preserves flexibility while controlling the minimum content displayed.

How to Test Your Ads

The "replace the loser" method

1. Create your RSA with 15 headlines and 4 descriptions
2. Let it run 2–4 weeks (minimum 1,000 impressions per headline)
3. In Google Ads, check performance by asset (headline by headline)
4. Identify headlines rated "Low" by Google
5. Replace them with new variants
6. Repeat

What to measure

• CTR by headline — does the headline attract clicks?
• Post-click conversion rate — does the click lead to a conversion?
• Ad strength — Google's indicator (Excellent > Good > Average > Poor)

A headline with excellent CTR but low conversion rate might be clickbait. It attracts unqualified clicks. A good headline attracts AND converts.

Testing frequency

Swap 2–3 headlines every 3–4 weeks. No more. Each change resets the learning phase. If you change everything at once, you won't know what worked.

Common Ad Writing Mistakes

1. Headlines that are too similar

"Google Ads Expert," "Google Ads Specialist," "Google Ads Professional" — that's the same headline three times. Google learns nothing. Vary the angles.

2. No numbers

"Great results" says nothing. "312% average ROI" says everything. Numbers stand out visually and are more credible.

3. Vague CTA

"Learn more" isn't a CTA. "Get your free audit" is. Be specific about what the user gets by clicking.

4. Ignoring ad-to-page consistency

Your ad promises a "quote in 24 hours." Your landing page mentions no timeline and shows a generic form. The user feels misled. Bounce rate spikes. Quality Score tanks.

The ad's message and the page's content must be aligned word-for-word on the main promise.

5. Forgetting mobile

60%+ of clicks come from mobile. On mobile, only the first 2 headlines and the first description are displayed. If your main message is in headline 3, it's invisible to most users.

Headline Formulas That Work

Proven structures:

• [Keyword] + [Benefit] — "Google Ads: Double Your Leads"
• [Number] + [Result] — "+312% Average ROI"
• [Question] — "Wasting Too Much Budget?"
• [Proof] + [Authority] — "15 Years | 500+ Clients"
• [Offer] + [Condition] — "Free Audit — No Commitment"
• [Action] + [Timeline] — "Quote in 24 Hours"

Extensions That Complement Your Ads

Extensions (assets) add extra information to your ad without counting toward character limits. They increase click surface area and CTR:

• Sitelinks — complementary pages (pricing, method, references, contact)
• Callouts — short benefits ("No Commitment," "Certified Google Partner")
• Structured snippets — service types or industries
• Call extensions — clickable phone number

Enable them all. They're free and only appear when Google determines they'll improve performance.

The Ad Within the Optimization System

A good ad won't save bad targeting. And good targeting won't compensate for a mediocre ad. Ads are part of a Google Ads optimization system where every element amplifies the others: keywords, ads, landing pages, tracking, bids.

Write, test, iterate. That's the only path to ads that convert.

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