Remarketing Lists for Search Ads (RLSA) let you tailor Google search campaigns based on whether someone has visited your website or app, and which pages they viewed. You can adjust bids or serve specific ads only to these past visitors when they actively search on Google. This connects audience data to search intent, helping you spend budget on users who already know your brand rather than cold prospects.
What is RLSA?
RLSA is a Google Ads feature that applies remarketing audience lists to search campaigns. Unlike display remarketing, which shows ads to past visitors while they browse other websites, RLSA only triggers ads when a user on your list performs a Google search using your targeted keywords. You choose how strictly to apply the list: either show ads exclusively to these users, or show ads to everyone but bid differently for the list members.
The system uses cookies to track users and add them to lists. To use RLSA, you must install the AdWords remarketing tag on your website—not the Google Analytics remarketing code—and maintain a minimum list size of [1,000 members] (WordStream) for the list to serve on the search network.
Why RLSA matters
RLSAs bridge the gap between broad keyword targeting and qualified user intent. Key outcomes include:
- Efficient budgets for small spenders. If you have limited ad spend, you can limit search ads to only users who previously visited your site. This stretches budget further because the audience is pre-qualified.
- Safer bidding on generic terms. You can bid on vague, high-cost keywords like "Chanel" only for users who previously visited your cosmetics page. This reduces waste while testing broader reach.
- Higher conversion rates. Users already aware of your brand typically convert better than first-time searchers.
- Upsell opportunities. Target past buyers with complementary products (like phone cases after phone purchases) because they already trust your checkout process.
- Exclusion controls. Block ads from users who recently converted or submitted an inquiry, preventing wasted spend on users already in your sales process.
- Automated bidding enhancement. If you use conversion-based automated bid strategies, Google incorporates your remarketing list data to calculate bids, potentially boosting performance. Google [announced this functionality in June 2014] (WordStream).
How RLSA works
To launch RLSA, follow these steps:
- Install the remarketing tag. Place the AdWords remarketing code on every page of your website before the closing
</body>tag, including conversion confirmation pages. Update your Privacy or Cookie Policy to declare use of DoubleClick cookies. - Create remarketing lists. In Google Ads, build lists based on specific page visits (e.g., cart page, pricing page). Set membership duration carefully: you need at least 1,000 active users, and [RLSA lists can only have a maximum duration of 180 days] (WordStream).
- Apply lists to campaigns. Add your remarketing list to existing search ad groups.
- Choose targeting mode. Select Target and bid to show ads only to list members, or Bid only to show ads to all users but adjust bids for list members.
- Set bid adjustments. If using Bid only, apply positive or negative percentage bid modifiers based on user value (e.g., +10% for cart abandoners, -20% for converted users).
Targeting modes
Target and bid: Your ads appear only when the searcher is on your remarketing list and uses your keywords. Use this for strict retargeting or upsell campaigns.
Bid only: Your ads appear for all searches on your keywords, but you pay more or less depending on whether the searcher is on your list. Use this for broad reach with value-based prioritization.
Best practices
Segment lists by buyer stage. Create separate lists for homepage visitors, product page viewers, and cart abandoners. Bid highest for those closest to purchase and tailor ad copy to match their last action (e.g., "Still thinking about that TSA suitcase?" for cart abandoners).
Create dedicated campaigns for generic terms. When bidding on broad keywords like competitor names or industry terms for past visitors only, isolate them in separate campaigns. This prevents them from consuming budget meant for high-intent terms and lets you control spend tightly.
Exclude overlapping audiences. If you run separate campaigns for new versus returning visitors, add your returning visitor list as a negative audience to your new-user campaign to prevent overlap and data pollution.
Tailor landing pages. Use dynamic landing page tools to change page content for RLSA traffic. Show returning visitors pricing discounts or loyalty benefits rather than generic introductions.
Test brand campaigns for new users. If your goal is customer acquisition, run a brand campaign that excludes past site visitors. This isolates spend to true new prospects, though expect lower conversion rates than standard brand campaigns.
Common mistakes
Mistake: Confusing RLSA with display remarketing. You expect ads to show automatically just because someone visited your site.
Fix: Remember RLSA requires an active search on your keywords. The user must search; you cannot push ads to them while they browse other sites.
Mistake: Using the wrong tracking code. You implement Google Analytics remarketing code and wonder why lists don't populate for RLSA.
Fix: Use the AdWords remarketing tag specifically. You can run both tags simultaneously, but RLSA requires the AdWords version.
Mistake: Creating lists that never reach the serving threshold. You build a 30-day list for a low-traffic site and see no RLSA activity.
Fix: Check your analytics to see how many days it takes to accumulate 1,000 unique visitors. Set your membership duration to at least that length.
Mistake: Overlapping audience targeting. You apply the same remarketing list to multiple campaigns without exclusions, causing internal auction competition.
Fix: Exclude your RLSA lists from standard campaigns when running parallel dedicated RLSA campaigns.
Mistake: Retargeting converted users who are in active sales negotiations. You waste budget on users already talking to your sales team.
Fix: Create a negative audience for "thank you" or "contact confirmation" page visitors, or reduce bids significantly for recent converters.
Examples
Example scenario: Cart abandonment
A user visits a luggage site, adds a TSA-approved suitcase to cart, but leaves without purchasing. The retailer adds them to an RLSA list. Two days later, the user searches "luggage." The retailer bids aggressively on this broad term only for this list, showing an ad with copy highlighting a birthday discount and free shipping.
Example scenario: Upselling accessories
A mobile phone retailer normally avoids advertising "phone cases" because the margins are thin. Using RLSA, they target only users who completed a phone purchase in the last 30 days. The ad copy reads "Complete your setup—20% off cases for our customers." This justifies the ad spend because the audience has already proven purchasing intent.
Example scenario: Competitor brand bidding
A software company wants to appear when users search for "CompetitorName," but only if the user previously visited their own site (indicating they are comparison shopping). They create an RLSA campaign targeting their own site visitors only, bidding on the competitor keyword. This keeps the brand visible during evaluation without wasting budget on users unaware of their solution.
RLSA vs Display Remarketing
| Aspect | RLSA | Display Remarketing |
|---|---|---|
| Network | Google Search results | Google Display Network (websites, apps) |
| User state | Actively searching for keywords | Passively browsing content |
| Ad trigger | Keyword search + list membership | List membership only (automatic) |
| Intent level | High (active problem-solving) | Low to medium (awareness/interest) |
| List duration | Max 180 days | Can exceed 180 days (varies) |
| Minimum list size | 1,000 users | 100 users |
Rule of thumb: Use RLSA when you want to modify search bids or copy for people who know you. Use display remarketing when you want to stay visible while they browse news sites or YouTube.
FAQ
What does RLSA stand for?
RLSA stands for Remarketing Lists for Search Ads. It is a Google Ads feature that lets you customize search campaigns for users who previously visited your website.
How is RLSA different from regular remarketing?
Standard display remarketing shows banner ads to past visitors while they browse other websites. RLSA targets past visitors only when they perform a new Google search using your keywords. With RLSA, the user must be actively searching; you cannot show ads purely based on list membership.
What is the minimum audience size for RLSA?
You need at least [1,000 members] (WordStream) on a remarketing list for it to be eligible for the search network. Calculate how many days it takes your site to get 1,000 unique visitors and set your list membership duration accordingly.
How long can I keep users on an RLSA list?
[Membership duration is capped at 180 days] (WordStream) for lists used with RLSA. If you need to maintain targeting beyond 180 days, you must rely on display remarketing or re-engage the audience through other means.
Can I use Google Analytics to create RLSA lists?
No. While you can use Google Analytics for display remarketing lists, RLSA specifically requires the AdWords remarketing tag installed on your website. You can run both codes simultaneously without conflict.
Should I bid on my brand terms using RLSA?
You can use RLSA to isolate brand spend to new users only by excluding past visitors, or to prioritize returning visitors with specific offers. Test both approaches: one campaign targeting returning visitors with loyalty messaging, and another targeting new users with introductory copy.
Why are my RLSA campaigns not getting impressions?
Check three things: Is your remarketing list populated with at least 1,000 active users? Is the AdWords tag firing correctly on your pages? Did you set the targeting to "Target and bid" without accidentally restricting the audience too narrowly with additional demographic filters?
