How do I set up Google Ads remarketing (retargeting) and its tag?

The remarketing tag is the Google tag, the snippet that used to be called the global site tag (gtag.js). Google describes it as “a block of code that adds your website visitors to your data segments”. You must install it “on every page of your website, but you need only one Google tag for each Google Ads account”. On each page it records the page’s URL and title, which is what a list’s rule reads.

If you came looking for a Google Ads retargeting pixel, this is it. The pages read for this guide call it a tag throughout.

1. 01Go to Tools › Data manager.
2. 02Under Google tag, select Manage beside your tag.
3. 03Beside Your Google tag, select Installation instructions, then Install manually.
4. 04Copy the snippet and paste it into the code of every page, immediately after the <head> element. Google says not to add more than one Google tag to a page.
5. 05In Test your website, enter your site’s address and select Test.

Google’s pages don’t agree on where the tag is kept. Its older pages on tagging a site, on audience sources and on the tag’s alerts send you to Audience manager, to a tab named Your data sources or Audience sources, where a card holds the tag. Its pages about Audience manager and about Data manager say those options “are now located in the ‘Data manager’ page”, which is where the steps above go.

There are other ways to get the same tag onto a site:

• Through Google Tag Manager. Create a tag, choose Tag Configuration, then Google Ads Remarketing, and enter your Google Ads Conversion ID. For its trigger, Google’s example is one that fires on all pages. The Conversion Label field is optional, and Tag Manager Help warns that a conversion action’s label there “will inflate conversion counts”.
• With a Google tag you already have. If you use Google Ads and Google Analytics, Google says to set the tag up in one of them and add the other “as a destination in your Google tag settings”. A second copy of the tag isn’t needed.
• From Google Analytics instead. A Google Analytics property linked to your account can share the audiences you build there, and Google’s page on list sizes says Google signals has to be on in Analytics for them to fill. A Google Analytics property can’t supply dynamic remarketing for a website.

Then check that it works. Google says data collection can take up to 30 minutes to start. After that:

1. 01Open Google Tag Assistant at tagassistant.google.com and enter your site’s address.
2. 02Check that your Google tag is among the tags it detects at the top.
3. 03Open the Summary tab and check that the tag sent events. If it sent none, Google’s reading is that the tag “may not be connected to your destination”.

Google Ads keeps its own count as well. The tag’s data source shows the hits it received, by the hour for the last 7 days and by the day for the last 30, and Google says an active tag’s source begins to fill within 24 to 48 hours. If nothing arrives, Google Ads shows an error message 24 hours after the source was created.

A tag that fills lists collects data for personalized advertising. Two sets of rules come with that: one about what your visitor agreed to, and one about what you advertise.

Consent. Google’s page on the tag says to get consent for the data you collect “where legally required”, and where you haven’t, to “deactivate the collection of remarketing data”. For visitors in the European Economic Area it enforces its EU user consent policy: to keep using remarketing, “you must collect consent for use of personal data from end users based in the EEA and share consent signals with Google”.

Those signals travel through consent mode, and two of its settings decide who can join a list:

• ad_user_data “sets consent for sending user data to Google for advertising purposes”.
• ad_personalization “sets consent for personalized advertising”.

Google’s consent mode reference says both “need to be granted to enable personalized advertising”. With ad_personalization denied, it lists remarketing in Google Ads among the features that “won’t receive data”. So a list holds the visitors who agreed, and not everyone who came. The tag has an older parameter with the same effect, allow_ad_personalization_signals, and setting it to false doesn’t turn off conversion tracking.

Policy. Google’s personalized advertising policy names sensitive interest categories, among them health, alcohol, gambling, negative financial status, political content and religious beliefs. An advertiser promoting in one of them is “unable to use advertiser-curated audiences”, which the policy lists as Customer Match, your data segments, audience expansion and lookalike segments. Google’s predefined audiences, such as in-market and affinity segments, stay open to them. Its pages on your data segments add that Google Ads “doesn’t permit the implementation of tags on pages related to policy-restricted offers”.

The same policy sets limits for every advertiser:

• No list may be used “in a way that targets an overly narrow or specific audience”.
• No personally identifiable information may be shared with Google through the tag.
• Nobody under 18 is eligible for personalized advertising of any kind.

If Google flags an ad under this policy, its page gives three ways out: take your own lists out of the ad’s targeting, edit the content that falls under the policy, or appeal if Google read it wrong. The disapproved ads guide covers an ad that serves with limits.

Your lists are in Audience manager, at Tools › Shared library › Audience manager, which opens on Your data segments. Its table gives each segment’s type, its membership status and its size on each network. A Google Ads remarketing audience is a row in that table.

Google Ads makes some segments for you once the tag is in place:

• All visitors is “anyone who visited your website or app”.
• All converters is “anyone who converted on your website”. It’s filled by your conversion tracking tag, and stays empty if conversion tracking isn’t set up.
• Google Ads optimized segment combines several segments from your audience sources into one.

You can’t edit or delete those. Your own are made by rule, and Google says that with rules “you can create as many segments as you want without having to add more tags to your website”.

1. 01In Audience manager, select the plus button, then Website visitors.
2. 02Name the segment, and choose who it holds under Segment members.
3. 03Under Actions, keep Web page visit and enter the number of days.
4. 04Select Refine action. Choose Page URL, a condition such as contains, equals or starts with, and the value to match.
5. 05Under Pre-fill options, choose to add the site’s visitors from the previous 30 days, or to start with an empty segment.
6. 06Select Create segment.

A rule on part of an address covers every page under it. In Google’s example, an airline’s rule Page URL contains flights collects visitors to its flights page and to each page beneath it. Rules joined with AND make a list smaller, since a visitor has to meet them all. Rules joined with OR make it larger.

A list can be made from other things than page visits:

• Your customers. Customer Match turns contact details your customers gave you into a list that reaches them “across Search, the Shopping tab, Gmail, YouTube, and Display”. The Customer Match guide covers the upload, and keeping the list fresh.
• People who watched your videos. These lists come from your YouTube channel, and have a section below.
• What visitors did, not only where they went. The event snippet of dynamic remarketing sends actions such as a product viewed or a purchase completed, which a rule can read too.

A list you build keeps filling whether or not a campaign uses it. Finding the idle ones is the unused audience segments guide’s subject.

Size. Google’s pages on data segments say a list on the Google Display Network “must have a minimum of 100 active visitors or users within the last 30 days” before its ads can show, and give the same figure for the Search Network and for YouTube. For Search, another page gives a second figure, which the RLSA guide sets beside this one.

• Who counts. An active user isn’t everyone your analytics counted. Google Ads counts people “who have interacted with Google services and ads recently”, so a list reads smaller than your site’s traffic.
• Where to read it. Audience manager’s Size columns show how many people a list can reach on each network: Search, YouTube, Display and Gmail.
• How long a new list takes. It can take 48 to 72 hours to fill. Pre-filling starts it with the last 30 days’ visitors.
• How narrow a rule can be. Google warns that granular segments “may not be eligible to run as they may not meet the minimum requirements”. A list for one product page may never reach 100.

Membership duration. A visitor stays on a list for its membership duration: 30 days by default and 540 at most, on the Display Network and on Google Search alike. Each new visit starts the count again. Google’s advice is that the duration “should be similar to the length of your sales cycle”: a few days if you sell movie tickets, in its example, and a few months if you sell cars.

Google’s pages disagree on what a changed duration does to the people already on a list. Its page on how data segments work says the new duration “is applied to all current and future visitors or users”. Its page on editing a segment says that on the Display Network it “is applied only to site visitors that are added after this change”, and on the Search Network to both. Either way, the first page warns that the size shown “may be temporarily inaccurate” after a change, so read the list’s size again a few days later.

A list is Open while it adds people and Closed once it stops. Google closes one by itself: “if you don’t use the segment in your campaign or ad group targeting for 540 days, Google Ads will automatically close it”. You can reopen it at any time.

Google’s page for display remarketing is titled Create a Display campaign that uses your data. Such a campaign, it says, shows remarketing display ads “to people who have visited your website or used your app”.

1. 01Go to Campaigns › Campaigns, select the plus button, then New campaign.
2. 02Choose a goal, then Display as the campaign type. Enter your site’s URL and a name for the campaign.
3. 03Set the daily budget and the bid strategy. Google suggests a strategy from your goal. The others its page names are Target CPA, Maximize clicks, Maximize conversions and Viewable CPM, with Manual CPC if you don’t want Smart Bidding.
4. 04Choose locations and languages.
5. 05In Targeting, add your data segments. Google’s page says that to reach specific segments only, you set targeting to Manual and choose them.
6. 06Create your responsive display ads, review the campaign, and select Publish campaign.

To add lists to an ad group you already have, go to Campaigns › Audiences, keywords, and content › Audiences. In the Audience segments module select Show table, then Edit audience segments. Choose the ad group, find each segment with Search or Browse, tick it, and save. In a Display campaign, targeting sits on the ad group: Google’s page calls it ad group targeting.

A list is added under one of two settings, and for a retargeting campaign the choice matters:

• Targeting “restricts the reach of your ad group” to the people on its lists. Google recommends it “for all advertisers in their Display campaigns”.
• Observation “does not restrict the reach of your campaign or ad group”. The lists are reported, and the ads show to everyone the rest of the targeting reaches. Google recommends it for Search campaigns, and for the Display campaigns “of more advanced advertisers”.

Two more things follow from how lists combine. A visitor on more than one of your lists can be shown the ads of every campaign that uses them, and Google Ads enters the ad with the highest Ad Rank in the auction. And another targeting method in the same ad group narrows it: with Display keywords and lists both set to target, Google says the ads show “only to people in your data segments when they visit websites that match your keywords”.

Display campaigns are moving into Demand Gen. Google’s page dates the phased rollout of a migration tool to June 2026, and says that later, new Display campaigns can only be created within Demand Gen. Its table of what carries over marks remarketing lists as supported there, and bid adjustments and the Observation setting as not. The Display campaign guide has the dates, and the Demand Gen guide covers the campaign type.

Optimized targeting. It’s on by default: Google says it “is automatically turned on for all campaigns”. With it on, your lists are signals and no longer a boundary. “Your ads may show to users beyond your selected signals”, and where optimized targeting finds better traffic it “may reduce or stop serving traffic on your signals”.

Google’s pages advise it both ways for past customers. Its guide to optimizing Display campaigns says that to re-engage existing customers with optimized targeting, you include segments built with your data. Its page about optimized targeting gives an advertiser who wants previous customers to buy again as the case for manual targeting only, with optimized targeting turned off. So decide what the campaign is for. If it’s for past visitors alone, turn it off:

1. 01Go to Ad groups in the Campaigns menu, and select the campaign’s ad group.
2. 02Open its Settings, and expand Optimized targeting.
3. 03Clear the checkbox, and select Save.

If you keep it on, Google recommends Maximize conversions or Target CPA with it, since they use your conversion data, and says to wait two weeks before judging the result. What it spent on people outside your lists is the row named Total: Expansion and optimized targeting in the Audience segments table.

Exclusions. Someone who buys stays on your visitor lists until their membership runs out, so the campaign goes on showing to them unless you exclude them. Go to Campaigns › Audiences, keywords, and content › Audiences, and in the Exclusions module select Edit exclusions. Choose the campaign or the ad group, tick the segment, and save. All converters is the list ready made for this. You can’t add an exclusion while creating a campaign, only afterwards. Optimized targeting honors audience exclusions, and Google notes that an exclusion “may not apply to users who have opted out of ads personalization”.

Frequency. A list is a small audience, so the same people see the campaign often. Google lets you leave how often to Google Ads, which it marks as recommended, or set your own cap on the campaign, an ad group or an ad. Only viewable impressions count toward it. You set it after the campaign exists, under Additional settings, then Frequency management, in the campaign’s settings. The Display campaign guide covers when a cap of your own earns its place.

Placements. The ads follow the person, so they appear on whichever sites and apps that person opens. Where yours showed, and which sites and apps to keep them off, is the rest of the Display campaign guide.

Standard remarketing shows your ads to the people on a list. Dynamic remarketing, in Google’s words, lets you “show previous visitors ads that contain products and services they viewed on your site”. Google lists three things it needs:

• A feed of your products or services, with an ID, a price and an image for each. A retailer’s feed is uploaded to Google Merchant Center. Any other business uploads one to Business data in the Shared library.
• The tag with an event snippet. The Google tag stays on every page. The event snippet goes on the pages where the actions happen, such as product, cart and purchase pages, and sends the ID of what the visitor saw. In the tag’s setup you choose Collect specific attributes or parameters to personalize ads, then your business type.
• Responsive display ads, which Google fills from the feed.

The IDs the tag sends have to match the feed’s. Where they don’t, Google Ads shows an alert on the tag’s data source saying the parameter and the feed values don’t match.

Google says you can use dynamic remarketing only with Display, Performance Max and App campaigns. In a Display campaign you attach the feed in the campaign’s settings: open Additional settings, then Dynamic ads, and tick the box to use a feed for personalized ads. In a Performance Max campaign linked to a Merchant Center feed, it’s activated automatically once the site is tagged for it. Google Ads reports none of it by item: its page says item-level reporting needs a tracking system of your own. The Shopping feed guide covers a Merchant Center feed.

A list of people who watched your videos doesn’t come from the tag on your site. Google builds it from a YouTube channel linked to your Google Ads account, and it can hold people who viewed any video from the channel, viewed certain videos, subscribed, visited the channel’s home page, liked a video or added one to a playlist. Organic views and ad views both count.

1. 01Link the YouTube channel to your Google Ads account.
2. 02In Audience manager, select the plus button, then YouTube users.
3. 03Name the segment and choose the channel or the video.
4. 04Choose the action, and how many days a viewer stays on the list, up to 540.
5. 05Under Pre-fill options, choose the last 30 days’ viewers or an empty list, then select Continue.

The list can be used once it holds at least 100 viewers. Three limits apply to YouTube retargeting ads. Views of bumper ads and of non-skippable in-stream ads don’t add anyone. A video ad should run 11 seconds or longer to add people to a list. And a channel or video marked as made for kids can’t build one.

Once a list is in a campaign, Google Ads reports what its people cost and what they bought. One row means little by itself. Set each row beside the rest of its campaign:

1. 01Go to Campaigns › Audiences, keywords, and content › Audiences. In the Audience segments module choose Campaign view, then Show table, and set the date range to the last 30 days.
2. 02Note the list’s cost and conversions, and the campaign’s own from Campaigns › Campaigns. Take the list’s from the campaign’s. What’s left is the rest of the campaign.
3. 03Divide the rest’s cost by its conversions. That is what everyone else paid for a conversion.
4. 04Divide the list’s cost by that price. The answer is what its spend would have bought at their rate.
5. 05If the list bought under half of that, ask whether it could be luck. In Google Sheets, BINOMDIST takes the list’s conversions, the campaign’s conversions, the list’s share of the campaign’s cost, and TRUE, and returns the chance of that few or fewer.
6. 06Multiply the chance by the number of rows you compared, in every campaign, since each was another chance for luck to show. Under 5%, the gap is worth acting on.

At $33.94 a sale, the campaign reads well. One row is carrying less than its share. The rest of the campaign paid $26.20 for each of its 34 sales, a price at which the $331 spent on Blog readers (30 days) would have bought 12.6. It bought 2. The chance of so few is 0.12%, and 0.82% after the 7 rows compared across the account: these five and the two lists Cedar & Pine’s Search campaigns observe.

Table pages (30 days) looks worse and proves nothing. It bought no sale for $41, where 1.3 were expected, and a list as good as the rest does that about three months in ten. A list of 880 people can’t tell you more than that in a month.

Where your account records a real conversion value, compare the return as well, and act only when both are under half. Here they are: Blog readers (30 days) returned 1.32 for each dollar, against the rest’s 9.35. If the table has a row named Total: Expansion and optimized targeting, optimized targeting is on, and that row is people on none of your lists. Cedar & Pine turned it off, so its five rows add up to the campaign.

What the sum tells you to change depends on what the list brought, and on the bid strategy:

• A list far below the rest that sold nothing. Take it out of the ad group. In the table, select the dot beside its name, then Pause or Remove. A paused list goes on adding visitors, and the ad group stops targeting it.
• A list far below the rest that still sells. Ask first whether the ads fit its people. Someone who came for an article on rug care may not be shopping for a sofa. Under manual bidding or Maximize clicks, you can lower the list’s bid adjustment in the table’s Bid adjustments column, from −90% to +900% on a targeting method in an ad group. Smart Bidding strategies don’t use it.
• A list with too little spend to judge. Leave it, and read it again next month. A wider rule or a longer membership duration gives it more people to judge by.

Every day Goldbeater reads the audiences each enabled campaign and ad group targets or observes, with what each cost and brought in the last 30 days, and runs the sum above on every one with spend: the audience beside the rest of the campaign or ad group that holds it. It raises one that bought under half the conversions its spend would have at the rest’s rate, on at least $20, where so few is unlikely by chance once every audience tested in your account is allowed for (5% overall). Where your conversion value is real, its ROAS has to be under half the rest’s too. Where you count a cart or a form on the way to a sale, only the last step counts.

That is the list read above. The finding names the ad group, since that is where this campaign holds its lists, and it has one: the rest of the ad group is the rest of the campaign. Its cost, the 12.6 conversions expected and the two returns are the table’s, and its chance is the table’s 0.82% after the 7 rows compared, rounded up. Its estimate is what the list’s sales cost above the rest’s return: $331 less the $47 they would have cost. Table pages (30 days) isn’t raised, since $41 is too little to tell from luck.

The finding is advice, and Goldbeater drafts no change for it. What it advises follows the list and the bid strategy. For an audience that bought nothing, it says to exclude it. For one that converted, where the bid strategy applies an audience bid adjustment, it says to lower the bids with a −50% adjustment. Under Smart Bidding, as here, it says the strategy doesn’t use one, points at the ads and the landing page, and leaves the exclusion for you to weigh. It reads high where the audience cost $200 or more above the rest’s price, as this one did, and low where it still does better than your account’s other campaigns typically do.

An audience that bought over twice as much as its spend would have is raised too, only where the campaign bids manually or to Maximize clicks, with a +20% bid adjustment advised.

Other checks read your lists and the campaigns that use them:

• A list nothing uses. An open list of 1,000 people or more on Search, or a customer list of 100, that no enabled campaign or ad group names and no Performance Max audience signal holds. Cedar & Pine’s Cart abandoners list is one, in the unused audience segments guide.
• A setting at odds with the name. A campaign or ad group named for an audience, with a word such as remarketing, retargeting or visitors, and set to Observation, so its ads show to everyone. The RLSA guide shows that finding.
• A customer list gone out of date. One your campaigns exclude, target or signal that Google says hasn’t been updated in 90 days or more, or sizes under 100 people, in the Customer Match guide.
• No frequency cap. A Display or Video campaign without one. For Display the finding says this is Google’s recommended setting, and offers a cap only where repetition costs you.
• No exclusion anywhere. A Display or Video campaign that excludes no site, app or video itself or in an ad group and carries no placement exclusion list, on an account that excludes none. Both are in the Display campaign guide, which reads this same campaign by where its ads showed.
• Optimized targeting with nothing to aim at. A Display, Video or Demand Gen ad group with it on, whose campaign bids by a strategy that uses no conversion data, or bids for conversions and recorded none in 8 weeks on $20 or more.
• An ad kept from your lists. An enabled ad Google approved with a limit under its personalized advertising policy, which keeps it from being shown to your own lists. It reads low, in the disapproved ads guide.

The audit checklist has every one of these as a line to work through by hand.

What is the difference between remarketing and retargeting in Google Ads?

In Google Ads there is none: both mean showing ads to people who already visited your site or used your app. Google’s help pages mostly say remarketing, and one of those read says retarget. Since Google renamed its audience terms, Google Ads itself calls the feature your data and the lists your data segments.

Where do I find the Google Ads remarketing tag?

Under Tools, then Data manager: select Manage beside your Google tag, then Installation instructions. It’s the Google tag, one for the account, pasted on every page. Some of Google’s older help pages still point to a data sources tab in Audience manager, which its newer pages say has moved to Data manager.

Do I need Google Tag Manager or Google Analytics for remarketing?

No. The Google tag pasted into every page is enough. Tag Manager is another way to install it, through its Google Ads Remarketing tag type. A linked Google Analytics property can share audiences built there, though it can’t supply dynamic remarketing for a website.

How many people does a remarketing list need before its ads show?

Google’s pages on data segments say at least 100 active visitors or users within the last 30 days on the Display Network, and give the same figure for the Search Network and YouTube. A list’s size on each network is in Audience manager’s Size columns, and a new list can take 48 to 72 hours to fill.

How long does someone stay on a remarketing list?

For the list’s membership duration: 30 days by default, and 540 at most on the Display Network and on Google Search. Each visit to a tagged page starts the count again. Google suggests a duration about as long as your sales cycle.

Why is my remarketing campaign showing ads to people who never visited my site?

Usually one of two settings. Optimized targeting is on by default in a Display campaign, and with it on your lists are signals: Google says your ads may show to users beyond them. Or the ad group is set to Observation, which reports on the lists without limiting the ads to them. Turn optimized targeting off in the ad group’s settings, and set the lists to Targeting.

What does dynamic remarketing need that standard remarketing doesn’t?

A feed of your products or services, an event snippet beside the Google tag that sends the ID of what each visitor viewed, and responsive display ads for Google to fill from the feed. A retailer’s feed goes in Merchant Center. Google says dynamic remarketing runs only in Display, Performance Max and App campaigns.