Remarketing in Google Ads is three different tools that share a name. Remarketing Lists for Search Ads (RLSA) modifies your Search campaign bids based on whether the searcher has visited your site. Display remarketing shows banner and image ads to past visitors as they browse the web. Customer Match targets people on your existing customer or prospect list across Search, Shopping, Display, Gmail, and YouTube. Each works differently, performs differently, and requires a different setup approach.
Understanding which form to use — and where each tends to disappoint — determines whether remarketing adds meaningful incremental revenue or just adds cost to conversions that would have happened anyway.
RLSA is the most powerful remarketing tool in Google Ads for most advertisers, and also the most underused. The mechanics are straightforward: you create an audience of past site visitors (or specific segment — cart abandoners, product viewers, past purchasers) and apply a bid adjustment when that person then performs a Google search. A user who visited your pricing page yesterday and now searches your primary keyword gets a higher bid than a cold searcher, improving your ad position for a high-intent prospect without overpaying for every impression.
The bid adjustment model means RLSA does not add separate ads or separate campaigns — it modifies existing Search campaign bids based on audience membership. You can apply RLSA as an observation layer (no bidding change, just data collection on how visitors perform) or as a targeting layer (only show ads to people who have been to your site). Observation mode is the right starting point: run it for 30 days, see how your conversion rate differs between site visitors and non-visitors, then set your bid adjustment based on actual performance data. For most accounts, the observed lift is between 20% and 50%, which translates directly to the bid adjustment.
The limitation of RLSA is audience size. Google requires at least 1,000 active members in a Search remarketing audience before it will use the list for targeting or bid modifications. For accounts with under 10,000 monthly visitors, RLSA audiences frequently fall below this threshold, and the feature produces no impact. If your site traffic is below this level, focus on Customer Match instead.
Display remarketing is where most advertisers start with remarketing — and where most are disappointed. The disappointment comes from audience quality. A 'All visitors — 30 days' Display remarketing audience on the Google Display Network reaches millions of impressions across thousands of websites, but the vast majority of those impressions go to people who visited your site once, briefly, with no real intent. Display CPMs are low, but conversion rates are also very low. The effective CPA often exceeds what you pay on Search, with far less transparency into where your ads actually showed.
Display remarketing works best with tight audience segmentation and strict placement exclusions. Segment your display audience by intent level — product page visitors, cart abandoners, checkout starters — and exclude the lowest-intent visitors (homepage only, session under 30 seconds). Add placement exclusions to block apps, games, parked domains, and YouTube for Kids. Without these exclusions, a significant fraction of your Display remarketing budget goes to inventory that never converts. Smart Display campaigns with Target CPA bidding handle some of this automatically, but only when you have sufficient conversion data.
Customer Match lets you upload a list of email addresses, phone numbers, or physical addresses and target those people across Google's logged-in surfaces — Search, Shopping, YouTube, Gmail, and the Display Network. The critical distinction from pixel-based audiences: Customer Match works even for users who have never visited your site, and it persists through browser privacy changes because it is identity-based rather than cookie-based.
The best use cases for Customer Match are three: re-engaging lapsed customers with win-back offers on Search, suppressing current customers from prospecting campaigns (to avoid wasting budget on people who already converted), and seeding Similar Audiences that find new prospects who resemble your best customers. The suppression use case alone often generates positive ROI — removing 10,000 existing customers from your broad match prospecting campaigns reduces wasted spend immediately.
Customer Match match rates vary significantly based on data quality. Email match rates average 40–60% because not all users associate their primary email with their Google account. Upload multiple identifiers — email, phone, and physical address — to maximize matches. Note that Customer Match requires a minimum account spend history and policy compliance review; new accounts cannot use it immediately.
Remarketing works best as part of a coordinated structure rather than an add-on. The most effective setup: RLSA observations layered on all Search campaigns (data collection), RLSA bid boosts applied to high-intent site visitor segments, Customer Match suppression lists on all prospecting campaigns, and Display remarketing limited to cart abandoners and checkout starters with strict placement controls. This structure ensures remarketing dollars go to the highest-intent audiences rather than spreading thin across a broad retargeting net. Digital Face surfaces which of your remarketing audiences are actively spending, which have fallen below Google's minimum size thresholds, and where audience overlap is occurring across campaigns. Free plan at digital-face.nl, no credit card required.