PPC

How to Write Google Ads Copy That Actually Converts

27 March 2026 7 min read

Your Google Ads campaign can have perfect targeting, generous budgets, and flawless tracking — but if your ad copy does not compel people to click, none of it matters. Ad copy is the bridge between search intent and conversion, and most advertisers treat it as an afterthought. This guide breaks down how to write Google Ads copy that genuinely converts, covering headlines, descriptions, calls to action, ad extensions, and dynamic keyword insertion.

Understanding the Psychology Behind High-Converting Ad Copy

Before diving into tactics, it helps to understand why certain ads get clicked over others. Searchers on Google are in a task-completion mindset — they have a problem and want to solve it quickly. Your ad copy needs to accomplish three things in a fraction of a second:

Relevance: Prove you have what they are looking for
Differentiation: Show why you are better than the other results
Motivation: Give them a reason to click now

Every headline, every description line, and every extension should serve at least one of these purposes.

Writing Headlines That Stop the Scroll

Headlines are the most important element of your ad. Google displays up to three headlines in a responsive search ad, and the first two carry the most weight since the third headline does not always appear.

Headline Frameworks That Work

Keyword + Benefit: "Premium PPC Management — Grow Revenue 3x Faster"
Question + Promise: "Wasting Ad Budget? — We Fix That in 30 Days"
Social Proof + Offer: "Trusted by 200+ Brands — Free PPC Audit"
Urgency + Value: "Limited Spots — Book Your Strategy Call Today"

Include your primary keyword in at least two headlines. This improves Quality Score and signals relevance to both Google and the searcher. Our guide to Quality Score explains exactly how ad relevance impacts your cost per click.

Headline Mistakes to Avoid

Using your brand name as the only headline (unless you have strong brand recognition)
Writing headlines that only make sense when read together — each should stand alone
Using all caps or excessive punctuation (Google may disapprove the ad)
Being vague — "Great Services" tells the searcher nothing

Pro Tip: Write your headlines in pairs that work independently. Google's responsive search ads will combine headlines in different orders, so "50% Off First Month" needs to make sense next to any of your other headlines, not just the one you originally paired it with.

Crafting Descriptions That Close the Click

Descriptions are where you expand on your headline promise and give searchers the confidence to click. You have up to 90 characters per description line — use them wisely.

Description Best Practices

Lead with your strongest benefit or differentiator
Include specific numbers: "Managed £2M+ in ad spend" outperforms "Experienced team"
Address objections proactively: "No long-term contracts" removes a common hesitation
End with a clear call to action

For responsive search ads, write at least four distinct descriptions that each highlight a different selling point. This gives Google more combinations to test and improves overall ad performance.

Calls to Action That Drive Conversions

A weak CTA is one of the most common reasons ads underperform. "Learn More" and "Click Here" are passive and generic. Strong CTAs are specific, action-oriented, and aligned with the searcher's intent.

CTA Examples by Intent

High intent (ready to buy): "Get Your Free Quote Today" / "Start Your Free Trial"
Mid intent (comparing options): "Compare Our Plans" / "See Pricing"
Low intent (researching): "Download the Free Guide" / "Watch the Demo"

Match your CTA to the searcher's stage in the buying journey. Someone searching "best PPC agency UK" is comparing — "See Why 200+ Brands Choose Us" works better than "Buy Now."

Ad Extensions That Amplify Your Message

Ad extensions (now called assets in Google Ads) increase your ad's real estate on the search results page and provide additional reasons to click. They also improve your Quality Score and Ad Rank, which can lower your cost per click.

Essential Extensions

Sitelink extensions: Link to specific pages like pricing, case studies, or contact
Callout extensions: Highlight key benefits like "No Setup Fees" or "24/7 Support"
Structured snippets: List service categories or product types
Call extensions: Add a clickable phone number for mobile users
Image extensions: Add relevant visuals that make your ad stand out

Use a minimum of four sitelinks, four callouts, and two structured snippets per ad group. More assets give Google more combinations to test, improving performance over time.

Dynamic Keyword Insertion: When and How to Use It

Dynamic keyword insertion (DKI) automatically inserts the searcher's query into your ad copy, making the ad feel more relevant. It works by using the syntax {KeyWord:Default Text} in your headlines or descriptions.

When DKI Works Well

Tightly themed ad groups with closely related keywords
E-commerce ads where product names vary (e.g., "Buy {KeyWord:Running Shoes}")
Local service ads where location varies

When to Avoid DKI

Broad match keyword groups where queries can be unpredictable
Competitor keyword campaigns (your ad would display their brand name)
Sensitive industries where certain query terms could be inappropriate

Pro Tip: Always set a strong default text in your DKI tags. If the searcher's query is too long to fit in the character limit, Google will display your default text instead. Make sure it is compelling on its own.

Testing and Iterating Your Ad Copy

Writing great ad copy is not a one-time exercise. The best-performing accounts at Spires Digital run ongoing ad copy tests with clear hypotheses and measurement criteria.

A Structured Testing Approach

Test one variable at a time (headline angle, CTA, offer)
Run tests for at least two weeks or 100 conversions before drawing conclusions
Use ad variations in Google Ads to run controlled experiments
Document what you test and what you learn to build an institutional knowledge base

Focus on metrics that matter: conversion rate and cost per conversion, not just click-through rate. An ad with a lower CTR but higher conversion rate is almost always the better choice.

Frequently Asked Questions

How many headlines should I write for a responsive search ad?

Google allows up to 15 headlines per responsive search ad. We recommend using at least 10 to 12 unique headlines that cover different angles — keyword relevance, benefits, social proof, CTAs, and offers. This gives Google's machine learning enough variety to find winning combinations.

Does ad copy affect Quality Score?

Yes. Ad relevance is one of the three main components of Quality Score, alongside expected click-through rate and landing page experience. Copy that closely matches the searcher's intent and includes relevant keywords will score higher, lowering your cost per click and improving ad position. See our Quality Score guide for more detail.

Should I use the same ad copy across all ad groups?

No. Each ad group should have ad copy tailored to its specific keywords and audience intent. Using generic copy across all ad groups reduces relevance, lowers Quality Score, and typically increases your cost per click. Take the time to write unique copy for each ad group.

How often should I refresh my ad copy?

Review ad performance monthly and refresh underperforming assets. Even high-performing ads can suffer from creative fatigue over time, particularly in competitive industries. A good rule is to update at least 20-30% of your ad assets every quarter.

Great ad copy is the difference between campaigns that drain budget and campaigns that drive profitable growth. If you need help crafting ads that actually convert, get in touch with Spires Digital or book a free strategy call via Calendly — we will audit your current ads and show you exactly where the opportunities are. Learn more about our PPC management services.