YouTube Ads Targeting: Audiences, Content and Exclusions

YouTube ads targeting is the set of controls in Google Ads that decides who sees your video ad and where it appears: audience segments (affinity, in-market, life events, custom segments and your own data), content targeting (keywords, topics and placements), demographics, and exclusions. In campaigns that use optimized targeting, those choices act as signals rather than hard limits, so knowing which layer is a fence and which is a hint is the difference between a tight test and spend that drifts.

This guide walks through each targeting layer, how the layers combine, how optimized targeting changes the picture in Video and Demand Gen campaigns, and what to check in your own account before you raise a budget. It is about targeting only. Ad formats and costs are separate topics with their own pages on this site.

How YouTube ads targeting is organised in Google Ads

Google Ads groups targeting for YouTube into two families. Audience targeting describes the person: their interests, what they are shopping for, a life change they are going through, their demographic group, or a past interaction with your business. Content targeting describes the video or page the ad runs on: the keywords it relates to, the topic it belongs to, or the exact channel, video, site or app you pick.

Location and language sit above both families at campaign level. Exclusions sit across all of them and can be set at campaign, ad group or account level depending on the type. Most targeting is set at the ad group level, which is why a common structure is one ad group per audience or content theme, so the reporting tells you which idea worked.

How the layers combine

The combination rules matter more than any single setting. Google's help documentation describes location targeting as an intersection with audiences: someone has to be in your target location and in your audience to be eligible. Content methods behave differently. If you add topics, placements and keywords to the same ad group, the ad can show on content that matches any of them, so each extra content method widens reach instead of narrowing it.

That second rule surprises many advertisers. Adding a list of Thai cooking channels as placements and the topic "Food and Drink" to one ad group does not mean "cooking channels that are also about food". It means "cooking channels, or anything in the food topic". If you want a narrow test, keep one content method per ad group.

Audience segments: affinity, in-market, custom and your data

Affinity and custom affinity

Affinity segments describe people with a strong, long-running interest in a subject, such as cooking, travel or fitness. They suit awareness goals where the aim is to reach people who care about a category, not people who are ready to buy this week. Custom affinity is the tailored version, where you describe the interest yourself.

In-market and life events

In-market segments group people who are actively researching or comparing products or services like yours. They sit closer to a purchase than affinity, so they tend to be used for consideration and conversion goals. Life events segments group people around milestones such as moving house or getting married, and Google documents them as reaching people on YouTube and Gmail.

Detailed demographics

Detailed demographics describe shared traits beyond age and gender, for example college students, homeowners or new parents. They are listed as audience segments in Google Ads, not as part of the basic demographic controls, so you add them in the audience section of the ad group.

Custom segments

Custom segments are the most flexible audience tool for YouTube. You build one from three kinds of input:

• Keywords that describe interests or purchase intentions of your ideal customer.
• URLs of websites your ideal customer might visit. Google uses these to find people with similar browsing habits. It does not place your ad on those URLs.
• Apps your ideal customer might use, which lets Google find people who use similar apps.

For keywords there is a setting that changes how they are read. The default treats them as interests or purchase intentions. The alternative, "People who searched for any of these terms on Google properties", reaches people based on their searches on Google properties such as Google.com and YouTube. Google's help page states this search-based option only applies to campaigns running on Google properties; elsewhere the terms are used as interests. For a YouTube campaign, a custom segment built from a competitor-free list of high-intent search terms is one of the most precise audiences available.

Your data segments and Customer Match

Your data segments are people who have already interacted with your business: website visitors, app users, YouTube users who interacted with your videos or channel, and customer lists uploaded through Customer Match. On YouTube these are used for remarketing, for excluding existing customers, and as seeds for other features.

Two mechanics are worth knowing. First, Google documents a maximum membership duration of 540 days for a YouTube users segment, so a person drops off after the window you set. Second, a segment needs a minimum of 100 active users before it can serve; Google's Audience manager page describes this as 100 active visitors or users within the last 30 days. A list that shows as too small is not broken, it simply has not reached the threshold yet.

Content targeting: keywords, topics and placements

Content targeting puts your ad next to specific content instead of in front of a specific person.

• Keywords match your ad to YouTube videos, channels or website types related to the words you enter. In video campaigns this is contextual, not search, so a keyword here behaves very differently from a keyword in a Search campaign.
• Topics are broad subject areas across YouTube and the Google Display Network, for example a topic for autos or for beauty.
• Placements are the most exact control: a named YouTube channel, a single YouTube video, or a website or app on the Display Network.

One change to note: Google's help documentation states that content targeting can no longer be added to video conversion campaigns (Google's other name for Video action campaigns), and existing content settings were removed from them. Those campaigns have since been upgraded to Demand Gen, which offers contextual targeting with topics, placements and keywords. If you inherit an older account and wonder where the placement lists went, that is why. Content targeting remains part of awareness and reach work.

When content targeting beats audience targeting

Content targeting works well when the context itself is persuasive. A tyre brand on car review videos, a language school on study-abroad vlogs, or a kitchen appliance on recipe channels all benefit from the viewer already thinking about the category. Audience targeting works better when the right buyer watches all sorts of content and the context does not matter, which is the case for most consumer services.

Demographics

The basic demographic controls in Google Ads are age, gender, parental status and household income. You can include or exclude each group at ad group level. Every group includes an "unknown" bucket for people whose demographics Google cannot determine. Excluding "unknown" looks tidy but removes a share of reach that may be perfectly relevant, so make that call with your own reporting in front of you rather than by default.

Be careful not to stack demographics on top of a narrow audience and a narrow placement list in the same ad group. Because location and audiences intersect, each extra restriction shrinks the pool, and a small pool limits how well automated bidding can learn.

Optimized targeting in Video and Demand Gen campaigns

Optimized targeting is the feature that changes how everything above behaves. Google's help documentation lists it as available for Display campaigns, Demand Gen campaigns, and Video campaigns that use the Sales, Leads or Website traffic goals. It does not apply to Video campaigns built for awareness, reach or consideration; for those, Google points advertisers to audience expansion with their own data segments instead.

When optimized targeting is on, the audience segments and keywords you add are treated as signals. The system uses them as a starting point to find similar people likely to convert, and Google states plainly that if it finds better-performing traffic elsewhere it may reduce or stop serving on your signals. In practice, your audience list stops being a fence and becomes a hint.

A few details matter for setup:

• Google's "About optimized targeting" page describes it as turned on automatically, while the Demand Gen audience overview frames it as something advertisers opt in to. Do not assume either way: open the ad group settings and check the switch.
• You can turn it off in ad group settings if you need strict targeting, for example for a regulated product or a narrow B2B audience.
• It will not show ads to people you excluded with your customer data segments, and it respects your content exclusions and brand safety settings.
• In Demand Gen, turning it on also lets delivery go beyond your selected demographic signals. Google lets you limit this to age and gender, while warning that doing so may limit performance.

Demand Gen replaced Video action campaigns

If you used Video action campaigns for conversions on YouTube, Google has replaced them with Demand Gen. The help documentation says new Video action campaigns could no longer be created from April 2025, existing ones were upgraded automatically from mid-2025, and the final campaigns were upgraded by April 2026. Demand Gen adds Lookalike segments, which are built from a seed list and expanded as narrow, balanced or broad to trade similarity against reach. Google recommends putting Lookalike segments in their own ad groups so you can read their results separately.

Exclusions: the controls that stay hard

Exclusions are the part of YouTube ads targeting that optimized targeting does not override, so they deserve the most care.

• Audience exclusions. Exclude recent purchasers or current customers with a customer list or a website segment so prospecting budget is not spent on people you already have.
• Inventory type. Google offers three tiers, named Maximum, Moderate and Limited on the content suitability page (some older pages call them Expanded, Standard and Limited). Limited excludes as much sensitive content as possible and is meant for brands with strict requirements; it also reduces reach.
• Excluded content keywords and placements. Google documents up to 1,000 excluded content keywords at account level and up to 65,000 excluded placements. Brand safety controls for Video and Display are set up at account level.
• Content type exclusions. You can exclude embedded YouTube videos on other sites and live streams.

Google is open about the limits. Its help page says content exclusions may provide limited coverage of YouTube Shorts and of in-feed ads on YouTube. If brand safety on Shorts is a hard requirement, check which exclusion types the coverage table says Shorts supports before you rely on a keyword exclusion list.

Targeting layers compared

The table below summarises what each layer controls and how it behaves once it is combined with others.

A practical setup checklist

1. Pick the goal first. The campaign goal decides whether optimized targeting is even available and whether content targeting can be used.
2. Use one targeting idea per ad group. One custom segment, one in-market segment, or one placement list per ad group keeps reporting readable.
3. Check the optimized targeting switch. Decide deliberately whether your segments are fences or signals.
4. Load your exclusions. Customer list exclusions, inventory type and account-level placement exclusions before launch.
5. Read the "where ads showed" report after a week. Placement and audience reporting tells you whether delivery matches your intent, which matters most when optimized targeting is on.

As a hypothetical example: a Bangkok furniture retailer running a Demand Gen campaign might set up three ad groups, one with a custom segment of furniture search terms, one with a Lookalike segment seeded from past buyers, and one with optimized targeting and no hints at all. Comparing cost per conversion across the three after enough data has built up tells the advertiser which signals are adding value. The numbers in such a test belong to the account; there is no universal benchmark to copy.

What this means for Thai marketers

For Thai advertisers, custom segments are where local knowledge pays off. Thai buyers search in Thai, in English, and in transliterated mixes, so a search-based custom segment should include all three forms of the terms people actually type. Placement lists of Thai channels are easy to build by hand and work well for awareness; for conversion goals, use them as contextual targeting in Demand Gen. If you upload customer lists for Customer Match or exclusions, make sure the data was collected with consent that covers advertising use under Thailand's PDPA. Finally, check the location setting: targeting people "in or regularly in" Thailand is different from targeting people who show interest in Thailand, which matters a lot for tourism and hospitality brands.

YouTube work rarely runs alone. Search campaigns catch the demand that video creates, so it helps to plan both together with a team that handles Google Ads campaign management, and to feed warm viewers into remarketing campaigns across Google's networks. Brands that need broad local video reach outside YouTube can also look at the Thai video network.

FAQ

What is the most precise YouTube ads targeting option?

The most precise options are placements, which put your ad on a named channel or video, and custom segments built from search terms, which reach people based on what they searched on Google and YouTube. Placements only work in campaign types that support content targeting, such as Video campaigns for awareness and reach, and Demand Gen.

Does optimized targeting ignore my audience segments?

Optimized targeting treats your audience segments as signals, so it can serve beyond them and may reduce or stop serving on them if it finds better-performing traffic. It does respect exclusions made with your customer data segments and your content exclusions. If you need strict targeting, turn it off in the ad group settings.

Can I target people who watched my YouTube videos?

Yes, you can build a YouTube users segment from people who interacted with your videos or channel and use it for remarketing or exclusions. Google documents a maximum membership duration of 540 days and a minimum of 100 active users before the segment can serve.

Why do topics and placements in one ad group not narrow my reach?

Because content targeting methods combine as "any of", not "all of". An ad group with both topics and placements can show on content that matches either one, so adding methods widens reach. Keep one content method per ad group when you want a tight test.

Get your YouTube targeting set up properly

Good YouTube ads targeting comes from deciding which controls are fences and which are hints, then checking delivery reports against that plan. If you would like help planning audiences, content lists and exclusions for a Thai or regional campaign, see our YouTube ads service.