Google Ads retargeting (officially called remarketing by Google) is an advertising strategy that shows targeted ads to people who have already visited your website or interacted with your app. Instead of reaching cold audiences, Google Ads retargeting focuses on users who have demonstrated interest in your products, making them significantly more likely to convert.
For eCommerce store owners, Google Ads retargeting is one of the most cost-effective ways to recover abandoned carts, increase repeat purchases, and boost overall return on ad spend (ROAS). Studies consistently show that retargeted visitors are 70% more likely to complete a purchase compared to first-time visitors.
How Does Google Ads Retargeting Work?
Google Ads retargeting works by placing a small piece of tracking code (the Google Ads tag, formerly known as the remarketing tag) on your website. When someone visits your site, this tag adds them to a remarketing audience list. Later, when those users browse other websites in the Google Display Network, watch videos on YouTube, or use Google Search, your ads can appear to remind them of products they viewed.
The process follows three steps. First, a visitor lands on your website and the Google Ads tag fires, adding an anonymous cookie to their browser. Second, that visitor leaves your site without purchasing and continues browsing the web. Third, your retargeting ads appear on websites, apps, YouTube, and Gmail, bringing the visitor back to complete their purchase.
Types of Google Remarketing Campaigns
Google offers several types of remarketing campaigns, each suited to different goals and audiences.
Standard remarketing shows display ads to past visitors as they browse websites and apps in the Google Display Network. This is the most common type and works well for general brand awareness and bringing visitors back to your store.
Dynamic remarketing takes standard remarketing further by showing ads that feature the exact products a visitor viewed on your site. For eCommerce stores, dynamic remarketing is especially powerful because it personalizes the ad creative automatically based on each user's browsing history. If someone looked at a specific pair of shoes, they will see that exact pair in the ad.
Remarketing lists for search ads (RLSA) lets you customize your search campaigns for people who have previously visited your site. When a past visitor searches on Google, you can adjust your bids, show different ad copy, or target broader keywords specifically for these high-intent users.
Video remarketing targets users who have interacted with your YouTube videos or channel. You can show them ads across YouTube, Display Network sites, and apps.
Customer list remarketing (also called Customer Match) allows you to upload lists of customer email addresses. Google matches these to signed-in users and shows your ads across Search, Shopping, Gmail, and YouTube.
How to Set Up Google Ads Retargeting
Setting up Google Ads retargeting requires a few key steps. Start by installing the Google Ads tag (global site tag) on every page of your website. For Shopify stores, you can add this tag through the theme settings or use an app like Adwisely that handles tag installation and campaign setup automatically.
Next, create remarketing audience lists in Google Ads. You can segment audiences based on which pages they visited, how long they spent on your site, whether they added items to their cart, or whether they completed a purchase. The more specific your audience segments, the more relevant your retargeting ads will be.
For dynamic remarketing, you also need to set up a product feed in Google Merchant Center and link it to your Google Ads account. This feed provides the product images, titles, prices, and URLs that Google uses to build personalized ad creatives. Shopify stores can sync their product catalog to Merchant Center using the Google & YouTube channel app or through automation tools like Adwisely.
Finally, create your remarketing campaign. Choose the Display Network for standard or dynamic remarketing, or modify an existing Search campaign to use RLSA. Set your budget, select your audience lists, and create compelling ad creatives that encourage visitors to return.
Google Ads Retargeting Best Practices for eCommerce
Segment your audiences by behavior. Create separate audience lists for homepage visitors, product page viewers, cart abandoners, and past purchasers. Each group has different intent levels and should see different messaging. Cart abandoners, for example, respond well to urgency or discount offers, while past purchasers might respond to cross-sell or new arrival campaigns.
Set frequency caps. Showing the same ad too many times can annoy potential customers and waste your budget. A frequency cap of 3 to 5 impressions per user per day is a good starting point for most eCommerce stores.
Use membership duration strategically. The default audience membership duration is 30 days, but you should adjust this based on your sales cycle. For low-cost impulse purchases, a 7 to 14 day window may be sufficient. For higher-priced items, extending to 60 or 90 days can capture buyers who need more time to decide.
Exclude converted users. Once someone has made a purchase, remove them from your retargeting audience (or move them to a separate list for upsell campaigns). This prevents wasting ad spend showing product ads to people who already bought.
Test different ad formats. Google Display ads come in multiple sizes and formats, including responsive display ads that automatically adjust their size and layout. Test static banners, responsive ads, and different calls to action to find what drives the best return for your store.
Google Ads Retargeting vs. Facebook Retargeting
Both Google and Facebook offer retargeting capabilities, but they work differently. Google Ads retargeting reaches users across over 2 million websites in the Display Network, plus YouTube and Gmail. Facebook retargeting (powered by the Meta Pixel) reaches users on Facebook, Instagram, Messenger, and the Audience Network.
For eCommerce stores, running retargeting on both platforms typically produces the best results. Google captures users during active browsing and search behavior, while Facebook and Instagram reach users during social media sessions. Tools like Adwisely can automate retargeting across both Google and Meta from a single Shopify app, saving time and ensuring consistent audience targeting.
What Does Google Ads Retargeting Cost?
Google Ads retargeting costs vary based on your industry, competition, and audience size. On average, Display Network retargeting costs between $0.25 and $0.60 per click, which is significantly lower than standard Search ads. The cost per acquisition (CPA) for retargeting campaigns is also typically 50% to 75% lower than prospecting campaigns because you are reaching people who already know your brand.
For Shopify stores, a common starting budget for Google retargeting is $10 to $30 per day. As you gather performance data, you can scale up spending on the audience segments and ad formats that deliver the best ROAS. Many eCommerce businesses see a 4x to 10x return on their retargeting ad spend.
Frequently Asked Questions
What is the difference between retargeting and remarketing in Google Ads?
In practice, retargeting and remarketing mean the same thing in Google Ads. Google officially uses the term "remarketing" for its feature that shows ads to past website visitors. The term "retargeting" is more commonly used in the broader digital marketing industry. Both refer to the strategy of showing ads to people who have already interacted with your website or app.
How many visitors do I need to start Google Ads retargeting?
Google requires a minimum audience size of 100 active visitors within the last 30 days for Display Network remarketing and 1,000 active visitors for Search remarketing (RLSA). If your store is new or has low traffic, focus on building your visitor base through SEO and paid search before launching retargeting campaigns.
How long should I retarget visitors with Google Ads?
The optimal retargeting window depends on your product and sales cycle. For eCommerce, 14 to 30 days works well for most products. High-consideration purchases may benefit from 60 to 90 day windows. Monitor your conversion data to find the sweet spot where most retargeted visitors convert, and adjust your membership duration accordingly.
Can I use Google Ads retargeting with Shopify?
Yes. Shopify integrates with Google Ads through the Google & YouTube channel app for manual campaign management, or through automation apps like Adwisely that handle tag installation, product feed syncing, audience creation, and campaign optimization automatically. Adwisely creates retargeting campaigns across both Google and Facebook from a single dashboard.