How to Write Google Ads Copy That Actually Converts

Here is the uncomfortable truth about most small business Google Ads: they are painfully boring. Generic headlines, vague descriptions, and calls to action so weak they could not convince someone to pick up a free tenner off the pavement. And every single one of those bland ads is burning through your budget.

We see it constantly. Business owners spending hundreds (sometimes thousands) of pounds per month on Google Ads, yet running the same lifeless copy their competitors are using word for word. “Quality Service. Great Prices. Contact Us Today.” Sound familiar? That is not advertising. That is wallpaper.

Your ad copy is the single most controllable factor in your campaign’s success. You cannot control what your competitors bid, what Google charges per click, or how the algorithm feels on a Tuesday. But you can absolutely control the words that appear in front of your potential customers.

Those numbers should make you sit up. The difference between average and excellent ad copy is not a marginal improvement. It is a five-fold increase in click-through rate. For a small business, that is the difference between a campaign that pays for itself and one that quietly drains your bank account.

The Anatomy of a Google Ad That Works

Before we get into the good-versus-bad comparisons, you need to understand what you are working with. A responsive search ad gives you up to 15 headlines (30 characters each) and 4 descriptions (90 characters each). Google then mixes and matches them to find the best-performing combinations.

That structure is both an opportunity and a trap. Most businesses treat it as a form to fill in rather than a chance to sell. Here is what each element should be doing for you.

Headlines: Your First (and Possibly Only) Impression

Your headlines do the heavy lifting. They are the first thing a searcher sees, and in many cases the only thing they read before deciding whether to click or scroll past. Every headline should earn its place.

Strong headlines include your primary keyword, a specific benefit, a number or statistic, or a clear differentiator. Weak headlines state the obvious or say nothing your competitors could not also claim.

Descriptions: Where You Close the Deal

Descriptions are your chance to expand on the promise your headline made. This is where you handle objections, add proof, and tell people exactly what to do next. Do not waste these 90 characters on fluff.

Think of your description as a tiny sales pitch. Lead with your strongest benefit, back it up with a reason to believe, and finish with a clear instruction.

Extensions: Free Real Estate You Are Probably Ignoring

Sitelinks, callouts, structured snippets, call extensions – these are free additions that make your ad bigger and more clickable. Yet most small businesses either skip them entirely or fill them with afterthoughts.

Every extension you add gives Google more material to work with and gives your ad more space on the results page. More space means more visibility, more clicks, and a better Quality Score. There is genuinely no reason not to use them.

Good Ad Copy vs Bad Ad Copy

Theory is useful. Examples are better. Here is a side-by-side comparison showing exactly what separates ads that convert from ads that get ignored.

Notice the pattern? The bad copy talks about the business. The good copy talks about the customer’s problem and how quickly it gets solved. That single shift in perspective is worth more than any bidding strategy.

Practical Tips for Writing Ad Copy That Converts

You do not need to be a professional copywriter to write decent Google Ads. You just need to follow a few rules that most of your competitors are too lazy to bother with.

• Put your primary keyword in Headline 1. This is not optional. When someone searches “emergency plumber Bristol,” they want to see those words reflected back at them immediately. Match their intent, win their click.
• Use specific numbers instead of vague claims. “Over 500 five-star reviews” beats “highly rated.” “£49/month” beats “affordable pricing.” Numbers are concrete. Vague adjectives are ignorable.
• Address the objection before it forms. If people worry about price, lead with “no hidden fees.” If they worry about quality, lead with your review count or years of experience. Remove the friction before it stops the click.
• Write different ads for different keywords. A single ad group should not be trying to serve everyone. If you sell running shoes and walking boots, those need entirely different ad copy with entirely different messaging.
• Test headlines aggressively. Write at least 10-12 headline variations for each ad group. Google’s responsive search ads will test combinations for you, but only if you give them enough material. Three weak headlines give you three weak combinations.
• Steal from your best-performing organic copy. Check your Google Search Console data. Which page titles and meta descriptions get the highest CTR? Adapt that language for your ads. You already know it works.
• Include a genuine reason to act now. “Limited availability,” “offer ends Friday,” or “only 3 slots left this week” all work. But only use them if they are true. False urgency erodes trust fast.
• Never waste a description on your company history. Nobody searching for “accountant near me” cares that you were founded in 1997. They care whether you can sort their tax return before the deadline. Lead with their problem, not your biography.

One more thing: review your ads on a mobile device. Over 60% of Google searches happen on phones. If your ad copy only looks good on a desktop preview, you are optimising for the minority.

The Common Mistakes We See Every Week

After managing hundreds of Google Ads accounts, certain mistakes come up so often they deserve their own warning label. Here are the ones that cost small businesses the most money.

Mistake one: sending all traffic to your homepage. Your ad makes a specific promise. Your landing page needs to deliver on that promise. If someone clicks an ad about “kitchen renovations in Leeds” and lands on a generic homepage with six different services, they will bounce. And you will still pay for that click.

Mistake two: ignoring your Quality Score. Google rewards relevant, well-written ads with lower costs per click. A high Quality Score means you literally pay less than competitors for the same position. Good ad copy is not just about conversions. It directly reduces your costs.

Mistake three: writing ads you would never click yourself. This sounds obvious, but it is astonishing how many business owners approve ad copy that they would personally scroll right past. If it does not grab your attention, it will not grab your customer’s attention either.

The Optimisation Process Never Ends

Writing great ad copy is not a one-time task. It is an ongoing process of testing, measuring, and refining. The ad copy that works brilliantly in January might underperform by March as competitors adapt and customer behaviour shifts.

Review your ad performance at least fortnightly. Look at click-through rates by headline combination, check which descriptions drive the most conversions, and ruthlessly replace anything that is underperforming. The data is right there in your Google Ads dashboard. Use it.

And if you are running the same ad copy you wrote six months ago without testing a single variation, you are leaving money on the table. Guaranteed.