What is Google Remarketing and How Does It Work?

Google remarketing is an online advertising strategy that displays targeted ads to people who have previously visited your website or interacted with your brand. By using first-party data and tracking tags, it allows businesses to re-engage prospects as they browse other websites, watch YouTube videos, or use mobile apps, encouraging them to return and complete a purchase or enquiry.

How does Google remarketing work?

Google remarketing works by placing a tracking tag on your website to monitor visitor behavior. When a user visits your site and accepts your privacy settings, they are added to an audience list. Once they leave, Google displays your targeted ads to them as they browse other sites across the internet.

Once these users leave your website, your ads follow them across the Google Display Network (GDN), which reaches over 90% of internet users globally. For Kiwi businesses, this means your brand stays visible on high-traffic local publishers like NZ Herald, Stuff, Trade Me, MetService, and RNZ.

You can set customised rules for your audience segments based on intent signals. For example, you can build specific lists for users who viewed a high-value service page but didn't submit an inquiry, or target individuals who abandoned a shopping cart before completing checkout.

What is Google Consent Mode V2 and why is it required?

Google Consent Mode V2 is a technical tracking framework that adjusts how your website's analytics and advertising tags behave based on user consent preferences. It ensures your business collects conversion data and builds remarketing lists legally without violating modern global privacy frameworks.

The way remarketing works has changed significantly due to global privacy updates, browser tracking prevention (like Apple's Intelligent Tracking Prevention), and Google's shift away from third-party cookies.

To run effective remarketing campaigns today, you must adapt to a privacy-first tracking model:

• First-Party Data: Your own website visitor data and customer lists are now the foundation of remarketing.
• Google Consent Mode V2: To comply with modern privacy standards, websites must implement Google Consent Mode. This ensures your tracking tags adjust their behaviour based on whether a user accepts or declines tracking cookies.
• Enhanced Conversions: Passing hashed, first-party customer data (like emails or phone numbers) back to Google improves your audience match rates and ensures your data remains accurate.

What is the minimum audience size for Google remarketing?

The minimum audience size for Google remarketing is 100 active users within the last 30 days. This 100-user threshold applies across all campaign types, including Search, Display, YouTube, and Customer Match lists, making remarketing accessible for niche B2B providers and smaller local campaigns.

Google previously required 1,000 active users for Search campaigns, but updated its rules to standardize a 100-user threshold across all networks. You can verify these minimums directly on Google’s Data Segment Requirements page.

You also retain full administrative control over your campaign delivery:

• Membership Duration: You can set how long a user remains on your list (up to a maximum of 540 days).
• Frequency Capping: You can restrict how many times an individual user sees your ad per day to prevent audience fatigue.
• Placement Exclusions: You can block your ads from serving on specific low-quality apps or websites that do not align with your brand image.

What ad formats and sizes should you use for remarketing?

The most effective display remarketing formats combine static HTML5 banner ads with Responsive Display Ads. Creating banners in standard sizes ensures maximum coverage across web and mobile layouts, while responsive formats allow Google to automatically generate ad combinations for available spaces.

Because ad placements vary by publisher site, your visual assets need to fit standard display dimensions. At Adhesion, we build creative assets for the top five most common display banner sizes:

1. Medium Rectangle: 300x250
2. Leaderboard: 728x90
3. Half Page / Large Tower: 300x600
4. Large Rectangle: 336x280
5. Wide Skyscraper: 160x600

Combining these static sizes with Google's Responsive Display Ads guarantees your ad messaging renders clearly across both desktop screens and mobile environments.

How do you measure Google remarketing performance?

Google remarketing performance is measured through direct conversion tracking alongside view-through conversions. View-through tracking counts users who saw your display ad, did not click it immediately, but returned to your website later via a direct address or organic search to complete a conversion.

Display remarketing operates differently than paid search. Because display ads appear while users are reading local news or checking the weather forecast, immediate click-through rates are naturally lower.

However, seeing the ad creates brand recall. Prospective clients frequently spot an ad on Stuff or Trade Me, absorb the message, and search for your business name directly a few days later. Measuring view-through metrics ensures you capture the true return on investment (ROI) generated by your brand exposure.

How does Google remarketing compare to Meta (Facebook) remarketing?

Google remarketing targets users across millions of independent websites, apps, and YouTube using Google tag data. Meta remarketing targets users exclusively within Facebook and Instagram based on Meta Pixel data, custom customer lists, and integrated social profile activity.

While Google excels at catching users while they research topics across the wider web, Meta operates within its own closed ecosystem. One distinct advantage of Meta remarketing is its ability to build "Lookalike Audiences", i.e. using your core customer segment to target a broader audience of social users who exhibit identical online behaviors.

For a well-rounded strategy, businesses often use both platforms simultaneously to maximise their reach. To learn more, check out our insights on Does Facebook Advertising Work and explore our Google Ads management service and Meta Ads management service.

Is Remarketing Right for Your Business?

Google remarketing is ideal for any business with an online presence, especially those operating in competitive industries or managing long, considered sales cycles. It cost-effectively targets warm prospects who are already familiar with your brand, keeping you top-of-mind until they are ready to choose a provider.