RLSA in Google Ads: The Complete 2026 Guide

RLSA stands for Remarketing Lists for Search Ads, a Google Ads feature that lets you change bids, ad copy, or which keywords you target based on whether someone searching on Google already visited your site. It runs inside your existing Search or Dynamic Search Ads campaigns rather than as a standalone campaign type, so you spend more of your budget reaching people who already know your brand and less chasing a stranger's first search.

Key takeaways

• RLSA lets you adjust bids, ad copy, or keyword targeting specifically for people on a remarketing list who search on Google again.
• It attaches to an existing Search or Dynamic Search Ads campaign. RLSA is not a separate campaign type on its own.
• Two setups exist: Bid Only, which adjusts bids while still showing ads to everyone, and Target and Bid, which shows ads only to people on the list.
• Google Ads Help documents a 1,000-cookie minimum for search lists, but the practical bar has dropped fast. Search Engine Land reported a 100-user minimum across Search, Display, and YouTube as of December 2025.
• A remarketing list can hold a visitor for up to 540 days, with a 30-day default membership unless you extend it.
• In Google's own case study, tyre retailer Tirendo saw a 161% conversion rate increase and a 22% rise in sales after adding RLSA bid adjustments.

What is RLSA in Google Ads?

RLSA stands for Remarketing Lists for Search Ads. It is a targeting option inside Google Ads that attaches a remarketing list, a segment of people who already visited your site, used your app, or interacted with your brand, to a Search or Dynamic Search Ads campaign. Once that list is attached, you can bid differently, write different ad copy, or target keywords you would not risk for a cold audience, all specifically for the people on that list.

The name causes some confusion because most remarketing runs on the Display Network, showing banner ads on other websites. RLSA works the opposite way. It only fires inside Google's own search results, and only when someone on your list actively types a query you are bidding on. There is no passive banner exposure, no browsing another site and seeing your ad follow along. The trigger is always an active search. For the wider set of remarketing formats, including how RLSA compares with standard display remarketing and dynamic remarketing, see our full Google Ads retargeting guide.

How does RLSA actually work?

RLSA works by matching a remarketing list membership against a live search auction. Google's tag places a cookie or a signed-in user match when someone visits a tagged page on your site, adding them to whichever segments that visit qualifies for. When that same person later searches on Google, Google Ads checks whether they are on any list attached to your campaign and, if so, applies the instructions you set for that list: a higher bid, a different ad, or eligibility for a broader keyword.

Nothing about this changes how the auction itself works. You are still competing on Quality Score, bid, and ad relevance against everyone else bidding on that query. RLSA simply lets you enter that same auction with different settings depending on who is searching. A cold searcher sees your standard bid and generic ad copy. A warm searcher on your list can see a higher bid, ad copy that references what they viewed, or a keyword you only bid on for people who already understand your product.

What is the difference between Bid Only and Target and Bid in RLSA?

Bid Only and Target and Bid are the two ways to attach a remarketing list to a Search campaign, and they control who sees your ads, not just how much you pay for the click. Bid Only keeps your ads showing to everyone who searches your keywords, new visitors included, and simply raises or lowers your bid for the people on your list. Target and Bid restricts your ads to only the people on that list, which frees you to bid on broader or more generic keywords you would never risk for a completely cold audience.

Pick Bid Only when a campaign already performs well and you want an added layer of optimization without touching who sees your ads. Pick Target and Bid when you want to test more generic keywords cheaply, because you already know the audience has some familiarity with your brand. Many accounts run both: Bid Only bid adjustments on their core proven campaigns, and a separate Target and Bid campaign built around broader terms reserved for warm visitors only.

What is the minimum list size for RLSA?

Google Ads Help has long documented a 1,000-cookie minimum before a remarketing list becomes eligible to serve Search ads, a threshold meant to protect the privacy of the people in the list. That number has not held steady. Google began lowering it for Customer Match lists in Search campaigns in May 2025, and Search Engine Land reported in December 2025 that the minimum had fallen to 100 active users across Search, Display, and YouTube, covering both remarketing lists and customer lists.

Practically, this matters most for smaller sites. Under the older 1,000-user bar, a low-traffic business could take months to qualify for RLSA at all. At 100 users, most sites with even modest, steady traffic can build a usable list within a few weeks of tagging their pages, which turns RLSA from a large-advertiser tactic into something most active Search accounts can actually run.

How do you set up an RLSA campaign in Google Ads?

Setting up RLSA is mostly configuration inside an account that already runs Search ads. The order below avoids the most common setup mistakes.

1. Confirm you have an active Search or Dynamic Search Ads campaign with enough keyword and conversion history to judge whether RLSA is moving the needle later.
2. Build or reuse a remarketing list under Tools and Settings, then Shared Library, then Audience manager, then Segments. Base it on website visits, specific page views, or an uploaded Customer Match list of emails or phone numbers.
3. Open the campaign or ad group's Audiences tab and add the segment you just built or an existing one.
4. Choose Observation first if you are not sure how the audience performs yet. Observation reports on the segment's results without limiting who sees your ads, so you gather real data before restricting anything.
5. Apply a bid adjustment for Bid Only once you have enough Observation data to justify it. Google Ads Help's own worked example applies a 25% bid increase for visitors from the past 30 days, though the right number depends on how much more that audience converts for you.
6. Switch to Targeting for Target and Bid if the goal is bidding on broader or more generic keywords exclusively for your list. Build a separate ad group or campaign for this so the keyword strategy does not bleed into your main Search campaign.
7. Exclude recent converters with a negative audience so you are not paying to bid up impressions for people who already bought or already submitted a lead. Combine this with a clean negative keyword list so RLSA is not just adding a smarter bid on top of wasted spend elsewhere in the account.
8. Give the list time to populate before judging results. A new segment typically needs 24 to 48 hours on a moderately trafficked site, and longer on a lower-traffic one, before it clears the minimum size and starts serving.

If your Search account itself still needs work before layering RLSA on top, our Google Ads optimization playbook covers the sequencing that gives RLSA good data to work with once you add it, and our Google Ads audit checklist is a useful gut check before you start layering new tactics onto an account you have not reviewed in a while.

What are the best use cases for RLSA?

RLSA earns its place fastest in a handful of specific situations rather than as a blanket setting on every campaign.

• Broader keyword bidding for warm visitors. A category term too vague or expensive for a cold searcher can work fine for someone who already knows roughly what you sell, because you are not gambling on their intent the same way.
• Protecting brand terms efficiently. Bid more conservatively on your own brand keywords for cold traffic, since a first-time searcher landing on a competitor is a real risk, and bid up for warm visitors you already know convert well.
• Cart abandoners and pricing-page visitors. Ecommerce and SaaS accounts both see strong results bidding higher on Search for people who reached a cart or pricing page but did not convert, since that group is closer to a decision than a first-time visitor.
• Long B2B research cycles. A buyer who researches for months before signing benefits from a longer list duration, up to the 540-day maximum, paired with RLSA bid increases each time they search again during that cycle.
• Competitor conquesting, but only for warm traffic. Bidding on a competitor's brand name is often expensive and low-converting for cold searchers. Restricting it to your own past visitors through Target and Bid can make the economics work where it otherwise would not.

How much can RLSA improve performance?

Results vary by account, list quality, and how aggressively you set bid adjustments, so treat any single number as a reference point rather than a guarantee. Google's own published case study on RLSA remains one of the clearest documented examples: European tyre retailer Tirendo added RLSA bid adjustments to its Search campaigns and saw a 161% increase in conversion rate, a 22% rise in overall sales, and a 43% reduction in cost per order.

The consistent pattern across advertisers who see strong RLSA results is not a magic bid percentage. It is that visitors who already know your site convert at a meaningfully different rate than cold searchers on the exact same keyword, and RLSA is simply the mechanism that lets your bidding reflect that difference instead of treating every click on a keyword as equally likely to convert.

What RLSA mistakes should you avoid?

• Skipping Observation mode. Jumping straight to Target and Bid before you have data on how the audience actually performs is a guess dressed up as a strategy.
• Never excluding converters. Bidding up impressions for people who already bought or already converted wastes budget on an audience that does not need to see the ad again.
• Setting the bid adjustment too high, too fast. A large increase on a small list can burn budget quickly before you know whether the segment actually converts better.
• Forgetting list minimums. A segment under the active size threshold simply will not serve, no matter how well you configure the campaign around it.
• Using generic ad copy for warm visitors. RLSA gives you the option to reference what a visitor already saw. Reusing the exact same ad as your cold campaign wastes that advantage.
• Treating RLSA as separate from the rest of the account. A weak Search campaign with poor Quality Scores or messy keyword structure does not get fixed by adding RLSA on top of it.

Frequently asked questions

What is RLSA in Google Ads? RLSA stands for Remarketing Lists for Search Ads. It is a Google Ads targeting option that attaches a remarketing list of past site visitors to a Search or Dynamic Search Ads campaign, letting you adjust bids, ad copy, or keyword targeting specifically for people who already know your brand when they search again.

How is RLSA different from standard remarketing? Standard remarketing, sometimes called display remarketing, shows banner ads to past visitors as they browse other websites. RLSA only shows ads inside Google's search results, and only when a person on your list actively searches for a keyword you are bidding on, so there is no passive banner exposure.

What is the difference between Bid Only and Target and Bid in RLSA? Bid Only keeps your ads showing to every searcher and simply raises or lowers your bid for people on your remarketing list. Target and Bid restricts your ads to show only to people on that list, which lets you safely bid on broader or more generic keywords you would not use for a completely cold audience.

What is the minimum list size for RLSA? Google Ads Help documents a 1,000-cookie minimum for search lists, but Google has been lowering that bar. Search Engine Land reported in December 2025 that the active minimum had fallen to 100 users across Search, Display, and YouTube, extending a change that started with Customer Match lists in Search in May 2025.

How long can someone stay on an RLSA list? A remarketing list can hold a visitor for a maximum of 540 days, and the default membership window is 30 days unless you extend it when you build the list, according to Google Ads Help. A visitor who returns to your site before their membership expires gets their timer reset.

Do you need a Search campaign already running to use RLSA? Yes. RLSA is not a standalone campaign type. It is a targeting option you attach to an existing Search or Dynamic Search Ads campaign's ad groups, so you need active keywords and, ideally, some conversion history before layering it on.

Can RLSA use Customer Match lists instead of website visitors? Yes. You can attach an uploaded Customer Match list of emails, phone numbers, or mailing addresses to a Search campaign the same way you would a website-visitor remarketing list, and it follows the same 540-day maximum membership.

Should you use Observation or Targeting mode for RLSA? Start in Observation mode. It reports how the audience performs on your existing campaign without restricting who sees your ads, which gives you real data before you commit to Bid Only bid adjustments or a dedicated Target and Bid campaign.

How much should you increase bids for RLSA audiences? There is no universal number. Google Ads Help's own example applies a 25% bid increase for visitors from the past 30 days, but the right adjustment depends on how much better that audience actually converts for you, which is exactly what Observation mode is meant to show you first.

Does RLSA work with Performance Max campaigns? No, not in the same form. RLSA specifically applies to Search and Dynamic Search Ads campaigns. Performance Max campaigns use audience signals instead, which guide Google's automated bidding rather than applying a direct bid adjustment the way RLSA does.

What to do next

If you already run Search campaigns, the fastest RLSA win is usually the simplest one: build one segment for site-wide visitors, attach it in Observation mode, and see whether that audience actually converts differently before you touch a single bid. Once you have that answer, Bid Only or Target and Bid becomes a straightforward decision instead of a guess. If you want a second set of eyes on where RLSA fits into your account, book a free Google Ads and SEO call with Rankite and we will show you which searches are worth paying more for.