What is topic targeting in Google Ads, and when does it help?
Part of Google Ads placements
The short answer
Topic targeting in Google Ads makes ads eligible on Display Network pages, apps and YouTube videos about subjects chosen from Google's topic list, such as Travel or Autos & Vehicles. Google decides which content matches. It runs in Display, eligible Video and Demand Gen campaigns, and beside placements it widens reach to any match rather than narrowing it.
Key takeaways
- A topic is a subject from Google's own list, and Google classifies which pages, apps and videos belong to it; the advertiser never sees the full set in advance.
- Targeting a top level topic includes its subtopics, and Google notes that adding only subtopics can miss some pages.
- Topics and placements in one ad group reach content matching either, so a topic beside a site list opens the whole network on that subject.
- Video campaigns that drive conversions lost content targeting from early 2023, and their successors now run as Demand Gen.
- Topic exclusions sit on the Content page; Google's help pages do not agree on topic exclusions in every buying type, so confirm them in the account.
What is topic targeting in Google Ads?
Topic targeting allows your ads to be eligible to appear on any pages on the Display Network or YouTube that have content related to your selected topics.
Definition
- Topic (Google Ads)
- A subject category from Google's fixed list, such as Travel, with nested subtopics beneath it. The advertiser picks the category; Google's systems decide which pages, apps and videos are about it.
That division of labor is the whole point of a topic. A placement names a location the buyer has reviewed; a topic hands the classification to Google. Google's topic targeting page (opens in a new tab) gives Autos & Vehicles as an example, with subtopics such as Trucks & SUVs, Commercial Vehicles and Motorcycles, and warns that a popular topic may have thousands or even tens of thousands of pages. Pricing works like other targeting: a manual bid or an automated bid strategy.
Topics are set per ad group on the Content page. Google's setup steps (opens in a new tab) have the advertiser open Audiences, keywords, and content, choose Content, edit topics for an ad group, and select Targeting (recommended) or Observation. The Display placements guide covers what the Targeting and Observation choice changes.
Where does topic targeting run?
Topic support follows campaign type, and the list has shrunk as Google moved conversion focused video buying into Demand Gen. The table reflects Google Ads Help as checked in October 2026. Google says that as of September 2024 YouTube ads no longer use digital content labels, and that sensitive content exclusions apply to the Display Network and Google video partners.
| Campaign type | Topic targeting | Surfaces reached | Notes |
|---|---|---|---|
| Display | Yes, per ad group on the Content page | Display Network websites and apps | Display campaigns are moving into Demand Gen; Google began a phased rollout of a migration tool in June 2026 (help (opens in a new tab)) |
| Video (awareness and consideration) | Yes, per ad group | YouTube and the Display Network, per the topic targeting page | Topics also apply to non-skippable in-stream and bumper ads on YouTube TV in auction campaigns |
| Video campaigns that drive conversions | No | None | Content targeting was removed from these campaigns from early 2023; Video action campaigns were upgraded to Demand Gen by April 2026 (help (opens in a new tab)) |
| Demand Gen | Yes, as contextual targeting with placements and keywords | Display Network and YouTube (help (opens in a new tab)) | Google's pages disagree on topic exclusions at campaign and ad group level |
A topic in Google Ads is not the same thing as a content category in a standards taxonomy. IAB Tech Lab's Content Taxonomy (opens in a new tab), which IAB Tech Lab lists at version 3.1 with a December 2024 release date, names contextual targeting and brand safety as its typical uses; Google's topic list belongs to Google Ads. A plan that uses both should record which list each category came from.
What happens when topics and placements are in one ad group?
They add up. Google's page on combining content targeting types (opens in a new tab) says ads show on content that matches any of the topics, placements or Display or Video keywords targeted, and frames the combination as a way to reach a broader audience. A topic placed beside 30 reviewed sites does not restrict the campaign to topic pages on those sites; it adds every page Google files under that topic.
| Setup | What the ad group can reach | Strengths | Weaknesses |
|---|---|---|---|
| Placements only | The listed sites, apps, channels and videos | Every location was reviewed, and reports map to the approved list | Reach is capped by the list, and small lists can struggle to spend |
| Topic only | Any content Google classifies under the topic, network wide | Wide reach from one setting, little upkeep | The buyer has not reviewed the sites in advance and learns them from reports |
| Topic and placements in one ad group | Content matching either, which is the union of both | One ad group to manage | The topic dilutes the list, and reporting mixes reviewed and unreviewed locations |
| Topic and placements in separate ad groups | Each ad group reaches its own set, with its own budget share and bids | Reviewed and discovered reach stay apart in reporting and budget | More ad groups to maintain, and the topic ad group needs its own exclusions |
When does topic targeting help a placement plan?
A reviewed site list is the tighter control, and topics are the wider one. Topics earn a place when the plan needs reach the list cannot give, or when the team wants to find candidates it has not reviewed yet. The test is whether the buyer can live with Google's classification deciding where part of the budget goes.
Signs a topic ad group belongs in the plan
- The approved site list cannot spend its budget in the flight, and the client has accepted wider reach on the same subject.
- The brief's subject maps cleanly to a Google topic, without a second meaning that pulls in unrelated content.
- The topic will run in its own ad group with a set budget share, apart from the reviewed placements.
- Account level exclusions and content suitability settings are already in place before the topic goes live.
- Someone is assigned to read where ads showed each week and move good finds onto the reviewed list.
Topics are a poor fit when the client signs off a named list, when a regulated category requires knowing every site in advance, or when the brief's subject sits next to content the brand avoids. In those cases the discovery work belongs before launch, in the list, not in the auction.
How do you exclude topics in Google Ads?
Excluding a topic in a Display campaign, per Google Ads Help
- Open the Content page. In a Display campaign, choose Audiences, keywords, and content, then Content.
- Open Topic Exclusions. Use the Topic Exclusions tab on the Content page, which lists the topics already excluded.
- Add the topics. Add the topics or subtopics to keep ads away from for the ad group or campaign they belong to, then save.
- Check the targeting it overlaps. An excluded subtopic inside a targeted parent removes only that branch, such as Air Travel under Travel in Google's own example.
- Read the reports. Confirm in the first week that placements under the excluded topic stopped receiving impressions.
Google's topic exclusion page (opens in a new tab) gives the reasons: avoid pages that do not fit, filter out niche subtopics and keep budget on the content that matters. Its example is a travel agency that targets Travel and excludes subtopics "less relevant to their offerings like Air Travel."
Excluded content themes are a separate control on the account's content suitability settings. Google's content suitability page (opens in a new tab) lists them for YouTube, the Display Network and Google video partners, with Content Suitable for Families, which includes Made for Kids videos, as one example.
What does a topic test look like on a real brief?
Fictional example
A bridal shop in Albuquerque and Tucson
A fictional bridal and formalwear shop with stores in Albuquerque and Tucson runs an English Display plan built on 26 reviewed wedding planning blogs and regional lifestyle sites. The list is sound but too small to spend the spring budget, and the client agrees to test wider reach on the same subject.
The buyer adds a second ad group targeting a weddings related topic from Google's list, with its own share of the budget, and leaves the reviewed placements alone in the first ad group. Two subtopics that drift toward honeymoon travel are excluded inside the topic ad group.
Each week the buyer reads where ads showed for the topic ad group, marks new sites as suitable or not, and moves the suitable ones into the reviewed list after the same checks the original 26 passed. Sites that do not fit go onto the campaign's placement exclusions.
How does PlacementGraph turn brief topics into specific sites?
Frequently asked questions
Is Google Ads topic targeting the same as Chrome's Topics API?
No. Topic targeting in Google Ads classifies content: pages, apps and videos about a subject. Chrome's Topics API is a browser interest signal from the Privacy Sandbox. Google said on October 17, 2025 that it would retire the Topics API; Chrome deprecated it in Chrome 144, and a June 11, 2026 follow-up on Chrome's blink-dev list proposed a staged removal from Chrome 150 to Chrome 152. None of this changes content topics in Google Ads campaigns.
How many pages can one topic reach?
Google does not publish a count per topic. Its topic targeting page says a popular topic may have thousands or even tens of thousands of pages, and a top level topic also includes every subtopic beneath it. That breadth is why a topic needs its own ad group, budget share and exclusions in a placement plan.
Can I see which sites a topic ad group reached?
Yes, after the fact. The where ads showed report lists the websites, apps, channels and videos where ads served, including those reached through topics. Read it weekly during a topic test, since the list of sites is only known once impressions have run, and move good finds into the reviewed list.
Does topic targeting reach apps as well as websites?
Yes. Google's topic targeting page describes ads showing on web pages, apps and videos about the chosen topics. A buyer who wants topic reach only on websites needs app exclusions on the campaign or account, set before launch, and should confirm in the reports that app placements stopped.
Sources
- About topic targeting (opens in a new tab)Google Ads Help
- Add topics to ad groups (opens in a new tab)Google Ads Help
- About combining content targeting types (opens in a new tab)Google Ads Help
- Exclude pages about a specific topic (opens in a new tab)Google Ads Help
- Demand Gen audiences overview (opens in a new tab)Google Ads Help
- Demand Gen Frequently Asked Questions (FAQ) (opens in a new tab)Google Ads Help
- About YouTube TV exclusions (opens in a new tab)Google Ads Help
- About content suitability (opens in a new tab)Google Ads Help
- Video Action Campaigns are being upgraded to Demand Gen (opens in a new tab)Google Ads Help
- Google Display Ads campaigns have a new home in Demand Gen (opens in a new tab)Google Ads Help
- Content Taxonomy (opens in a new tab)IAB Tech Lab
- Update on plans for Privacy Sandbox technologies (opens in a new tab)Google Privacy Sandbox
Researched and written by PlacementGraph Research. Read how we research, source and update these pages. Corrections: diana@placementgraph.com.