Google Ads copywriting with AI: Getting the prompt right

Creating effective ad copy has always been a critical skill for PPC marketers, especially in Google Ads. 

In the past, it meant hours of brainstorming, drafting, and A/B testing. 

Today, LLMs like Google’s Gemini can produce high-quality ad copy in minutes. 

But the results don’t come from the tool alone – they depend on the prompts you use to guide it.

Google does offer built-in AI features to suggest ad copy ideas and variants, but that’s not the same as generating ads in batch or scaling copy across titles and descriptions. 

Earlier this year, Google shared a guide on prompt best practices. 

This article narrows the focus to what matters most for Google Ads campaigns.

The foundation of a great prompt

Think of AI as a skilled treasure hunter or detective. 

Even the best hunter needs a map, and even the best detective needs clues. 

AI is no different – it knows a lot, but it can’t deliver what you want until you tell it exactly what to look for. 

The more specific, detailed, and clear your instructions are, the better the output will be. 

According to Google’s playbook, there are four main elements to get right.

Here are the four essential elements that form effective prompts in the context of ad copy creation.

Create the persona

Guide the AI by showing the role you play. 

For example: “I’m a Google Ads Manager at a search marketing agency.” 

This frames the request through the right lens.

Define the task

Know exactly what you want before you ask. 

Are you writing copy to get clicks, conversions, or awareness? 

A detailed task description adds clarity and ensures the tone, urgency, and CTA match your goal.

Provide context 

Give the AI the landscape: your audience, product or service, and unique selling points. 

Without context, it defaults to generic copy that won’t connect.

Specify the format

Ad copy has strict limits — 30 characters for headlines, 90 for descriptions. Include these in your prompt, or you’ll waste time editing and lose the benefit of scale.

Dig deeper: How to assemble captivating Google Ads copy

The anatomy of an ad copy prompt

Let’s combine these principles into a practical framework. 

A robust prompt for Google Ads copy should look something like this:

Create the persona

• “You are a skilled copywriter specializing in direct-response marketing for Google Ads. Your goal is to create compelling ad copy that drives conversions.”

Define the task

• “Our target audience is [describe your target audience, including their pain points, interests, and demographics].”
• Keywords and tone:
  • “The ad copy should be [describe the desired tone, e.g., urgent, professional, humorous]. Include the following keywords in the headlines and descriptions: [list your keywords].”
• Call to action:
  • “The primary call to action should be [e.g., ‘Shop Now,’ ‘Get a Free Quote,’…