Using AI to Write Better Google Ads Copy

Why AI Is Changing the Way We Write Ads

Pay-per-click advertising has always been a numbers game: write dozens of headlines, test them, keep the winners, discard the rest. The problem is that human creativity has limits. After the twentieth variation of the same value proposition, even experienced copywriters start recycling ideas. That is exactly where artificial intelligence steps in.

AI-powered writing tools do not replace the strategist behind the campaign. Instead, they act as a tireless brainstorming partner that can generate, evaluate and refine ad copy at a speed no human team can match. At HeyNow, we combine AI-assisted workflows with hands-on expertise to deliver campaigns that perform from day one.

Choosing the Right AI Tools for Ad Copy

Not every AI tool is built for advertising. General-purpose chatbots can produce fluent text, but they often lack the constraints that make ad copy effective: character limits, keyword density and a clear call to action. Look for tools that let you:

• Set character caps per headline and description line.
• Input target keywords so the output stays relevant to your ad group.
• Define tone and brand voice to maintain consistency across campaigns.
• Generate multiple variations in a single prompt for rapid A/B testing.

Popular options include Google Ads built-in asset suggestions, dedicated platforms like Jasper and Copy.ai, and custom GPT workflows. The best choice depends on your budget, volume and level of customisation.

Prompt Engineering for Google Ads

The quality of AI output is directly proportional to the quality of your input. A vague prompt like write a Google ad for shoes will give you generic results. A structured prompt produces gold. Here is a framework we use at HeyNow:

Write 5 responsive search ad headlines (max 30 characters each) for a running-shoe brand targeting marathon trainers aged 25-40. Emphasise lightweight cushioning and race-day performance. Tone: confident, energetic. Include the keyword marathon running shoes.

Notice the specifics: audience, benefit, tone, keyword and format. The more guardrails you give the model, the less editing you need afterwards.

Headline Formulas That Convert

AI works best when you feed it proven structures. Here are five headline formulas we recommend:

• Benefit + Qualifier: Lightweight Shoes for Race Day
• Number + Outcome: Run 10% Faster This Season
• Question Hook: Ready for Your Best Marathon?
• Social Proof: Trusted by 50K+ Runners
• Urgency + Offer: Free Shipping Ends Friday

Ask the AI to apply each formula to your product. You will end up with 20-30 usable headlines in minutes instead of hours.

A/B Testing at Scale with AI

Traditionally, A/B testing ad copy meant creating two or three variants and waiting weeks for statistical significance. With AI you can launch responsive search ads packed with 15 headlines and 4 descriptions, then let Google machine learning combine them while your AI tool monitors performance and suggests fresh alternatives for underperforming slots.

The feedback loop looks like this:

• Generate initial assets with AI.
• Run the campaign for 7-14 days.
• Export performance data (impressions, CTR, conversions).
• Feed results back into the AI with a prompt: These headlines had low CTR. Suggest replacements that are more direct and include the main keyword.
• Swap in new assets and repeat.

This iterative cycle is exactly how our Google Ads management team keeps campaigns sharp over time.

Maintaining Brand Voice

One risk of AI-generated copy is sounding generic. Every brand has a personality, and your ads should reflect it. We recommend creating a brand voice document that includes:

• Three adjectives that describe your tone (e.g., bold, approachable, expert).
• Words to always use and words to avoid.
• Example sentences that sound right.

Paste this document into every AI prompt as context. The model will adapt its output to match, saving you significant editing time. If you need help defining your brand voice, our branding team can build a complete style guide.

Ethical Guardrails

AI can generate misleading claims just as easily as honest ones. Always review output for accuracy, compliance with Google Ads policies and alignment with your actual product or service. Automated does not mean unsupervised.

Get Started with AI-Powered Ads

AI is not a magic button; it is a force multiplier for skilled marketers. When combined with strategic thinking, audience insight and continuous optimisation, it can dramatically reduce the time and cost of producing high-performing ad copy. Ready to put AI to work for your campaigns? Contact the HeyNow team and let us build an AI-assisted advertising strategy tailored to your business.