You can have perfect targeting, an unlimited budget, and a landing page that converts at 10%. If your ad copy doesn’t get the click, none of it matters.
Google Ads copy is the shortest, most constrained form of copywriting in marketing. You get 30 characters per headline and 90 characters per description. In that space, you need to match search intent, differentiate from competitors, and compel someone to click. Not “engage.” Not “consider.” Click.
Here’s how to write ad copy that actually drives conversions.
The Anatomy of a Google Ads RSA
Google’s Responsive Search Ads (RSAs) are the standard format. You provide up to 15 headlines and 4 descriptions. Google combines them into different variations and tests which combinations perform best.
Character Limits
| Element | Max Characters | Number Allowed |
|---|---|---|
| Headline | 30 characters | Up to 15 (min 3) |
| Description | 90 characters | Up to 4 (min 2) |
| Display URL path | 15 characters each | 2 paths |
What Shows in the Ad
Google typically shows 2-3 headlines and 1-2 descriptions. The display URL paths appear after your domain:
yoursite.com/Path-1/Path-2The Five Rules of High-Converting Ad Copy
Rule 1: Match the Search Intent Exactly
The searcher typed specific words for a reason. Your ad should reflect those words back to them.
Search: “emergency plumber near me”
- Bad headline: “Professional Plumbing Services”
- Good headline: “Emergency Plumber — Available Now”
Search: “buy running shoes online”
- Bad headline: “Athletic Footwear Collection”
- Good headline: “Running Shoes — Free Shipping Today”
The good headlines mirror the searcher’s language and address their immediate need. This improves both click-through rate and Quality Score. See our Quality Score guide for why this matters.
Rule 2: Include the Primary Keyword
Google bolds the search terms that appear in your ad. An ad with bolded keywords visually stands out on the results page and signals relevance.
If your keyword is “accounting software,” at least one headline should contain “accounting software.” Not “financial management tool.” Not “bookkeeping solution.” The actual words the person searched for.
Rule 3: Lead With the Benefit, Not the Feature
People don’t care about what your product does. They care about what it does for them.
| Feature | Benefit |
|---|---|
| ”AI-powered analytics" | "See what’s working in 30 seconds" |
| "256-bit encryption" | "Your data is 100% safe" |
| "Same-day delivery" | "Get it today — order before 2pm" |
| "24/7 customer support" | "Help whenever you need it" |
| "50+ integrations" | "Works with the tools you already use” |
Features are for your website. Benefits are for your ads.
Rule 4: Include a Number or Specific Claim
Specificity cuts through the noise of generic ad copy. Numbers and concrete claims stop the eye.
- “Save 37% on your first order” beats “Great savings available”
- “4.9 stars from 2,300 reviews” beats “Highly rated”
- “Ships in 24 hours” beats “Fast shipping”
- “$49/month, no contracts” beats “Affordable pricing”
Rule 5: End With a Clear Call-to-Action
Tell the searcher exactly what to do next. Don’t assume they’ll figure it out.
Strong CTAs:
- “Get a free quote in 60 seconds”
- “Shop the sale — ends Friday”
- “Start your free trial today”
- “Book your appointment online”
- “Download the free guide”
Weak CTAs:
- “Learn more”
- “Visit our website”
- “Click here”
- “Contact us”
Headline Templates That Work
Use these formulas as starting points, then customize for your business:
Template 1: Keyword + Benefit
{Keyword} -- {Primary Benefit}Examples:
- “Standing Desks — Work Pain-Free”
- “CRM Software — Close Deals Faster”
- “Yoga Mats — Non-Slip Guarantee”
Template 2: Keyword + Social Proof
{Keyword} -- {Number} {People/Companies} Trust UsExamples:
- “Accounting Software — 50K+ Businesses”
- “Wedding Photographer — 500+ Weddings”
- “Dog Training — 4.9 Star Reviews”
Template 3: Action + Outcome
{Action Verb} {Desirable Outcome}Examples:
- “Cut Your Tax Bill in Half”
- “Double Your Email Open Rates”
- “Sleep Better Tonight”
Template 4: Problem + Solution
{Pain Point}? {Solution Available}Examples:
- “Back Pain? Same-Day Relief”
- “Slow Website? We Fix It Fast”
- “High Ad Costs? Lower CPA Today”
Template 5: Offer + Urgency
{Offer} -- {Time Constraint}Examples:
- “50% Off — This Week Only”
- “Free Shipping — Today Only”
- “First Month Free — Limited Time”
Description Templates
Descriptions have more space (90 characters) and should expand on the headline’s promise.
Template 1: Feature + Benefit + CTA
{Feature that matters}. {Benefit to the customer}. {CTA}.Example: “AI tracks your expenses automatically. Save 5 hours per week on bookkeeping. Start free.”
Template 2: Social Proof + Differentiator + CTA
{Trust signal}. {What makes you different}. {CTA}.Example: “Trusted by 10,000 small businesses. No contracts, cancel anytime. Get started today.”
Template 3: Pain + Promise + CTA
{Acknowledge the problem}. {Your solution}. {CTA}.Example: “Tired of ads that don’t convert? We optimize your campaigns daily. Get a free audit.”
Template 4: Offer Details + Proof + CTA
{Specific offer}. {Credibility}. {CTA}.Example: “Plans from $29/mo with all features included. 4.8 stars on G2. Try free for 14 days.”
RSA Best Practices
Write Headlines That Work in Any Combination
Google can show your headlines in any order. Headlines 1-3 might appear as Headlines 3, 7, and 12 in a given impression. Make sure every headline makes sense standalone and in combination with any other headline.
Bad combination: “We’re the Best” + “Number One Choice” + “Top Rated” (repetitive) Good combination: “Free Shipping Over $50” + “4.9 Stars — 2K Reviews” + “Shop Running Shoes”
Pin Headlines When Necessary
If a headline must always appear in a specific position, pin it. Common uses:
- Pin your brand name to position 1
- Pin a time-sensitive offer to position 1 or 2
- Pin a CTA to position 3 (last headline)
But pin sparingly. Every pin reduces Google’s ability to test combinations.
Use All 15 Headlines and 4 Descriptions
Google’s algorithm performs best with maximum inputs. Don’t settle for the minimum 3 headlines and 2 descriptions. Fill all 15 headline slots and all 4 description slots.
Group by Intent, Not Just Keyword
Each ad group should have ads written for a specific intent:
| Ad Group Intent | Headline Approach |
|---|---|
| Commercial (“buy standing desk”) | Price, shipping, product benefits |
| Comparison (“standing desk vs treadmill desk”) | Differentiators, advantages |
| Brand (“UPLIFT desk”) | Brand trust, specific product names |
| Problem (“back pain from sitting”) | Problem acknowledgment, solution |
Use Display URL Paths
The two display URL path fields are free real estate for keywords and clarity:
yoursite.com/Standing-Desks/Shop-Now
yoursite.com/Free-Quote/Today
yoursite.com/Running-Shoes/SaleThese paths don’t need to match actual URLs on your site — they’re for display only.
What to Avoid
Clickbait That Doesn’t Convert
An ad that promises something the landing page doesn’t deliver gets clicks but not conversions. If your headline says “80% Off Everything,” your landing page better show 80% off everything.
Misleading ads also kill your Quality Score and increase your CPC. Google tracks post-click behavior.
All Caps and Excessive Punctuation
“BEST DEALS!!! BUY NOW!!!” looks spammy and Google may disapprove the ad. Use normal capitalization (title case for headlines is fine).
Ignoring Mobile
Over 60% of Google searches happen on mobile. On mobile screens, only the first 1-2 headlines and the first description typically show. Make sure your most important message is in your top headlines and first description.
Not Testing
Set up ad variations and let them run for at least 2 weeks. Check which headlines and descriptions Google combines most often and which combinations drive the highest conversion rates.
For more on testing campaigns effectively, see our Performance Max setup guide.
Measuring Ad Copy Performance
Look at these metrics for each ad variation:
| Metric | What It Tells You |
|---|---|
| CTR | How compelling the ad is (are people clicking?) |
| Conversion rate | How well the ad qualifies visitors (are clickers buying?) |
| CPA | What each conversion costs via this ad |
| Quality Score | How relevant Google considers your ad |
A high CTR with low conversion rate means your ad is compelling but attracts the wrong people (or overpromises). A low CTR with high conversion rate means your ad filters well but isn’t attracting enough clicks.
The Bottom Line
Google Ads copy is a constrained creative exercise. You have 30 characters to stop someone mid-search and convince them to click your ad instead of the three competitors above and below you. The formula is straightforward: match the search intent, lead with benefits, include specifics, and end with a clear CTA.
Write 15 headlines that follow these principles, fill all 4 descriptions, and let Google test the combinations. Then check back in two weeks and double down on what’s working.
And remember — the best ad copy in the world won’t help if your tracking can’t measure which ads convert. Run a free scan to make sure your conversion tracking is solid before you invest in copy optimization.