Topic targeting is a Google Ads setting that shows your display or video ads on websites, apps and YouTube videos about subjects you pick from Google’s list, such as home improvement, accounting software or running. It targets the content being viewed, not the person viewing it.
How topic targeting works
Google sorts the pages, apps and videos in its Display Network and on YouTube into a tree of topics. The broad branches, like Food and Drink or Business and Industrial, split into narrower ones, such as Cooking and Recipes under Food and Drink. When you add a topic to an ad group, your ads become eligible to appear wherever Google judges the content to be about that subject.
Topics sit alongside other contextual and audience options. Placement targeting names specific sites, apps or channels. Audience options such as in-market audiences follow the person, whatever they are reading. If you combine topics with other targeting in the same ad group, an ad usually needs to satisfy both, which narrows reach rather than widening it. You can also exclude topics, for example to keep a children’s brand away from news about crime.
At the time of writing (October 2026), topics are available in display and video campaigns. Performance Max and some newer campaign types decide placements largely by themselves and give you far less control over topics.
Why it matters
Topic targeting lets you reach people while they are thinking about a subject related to what you sell, without needing personal data about them. A Bristol garden landscaper can appear next to articles on patio design. A UK accountancy practice can appear on content about Self Assessment in the weeks before the 31 January deadline. Because it relies on context rather than tracking individuals, it still works when many visitors have declined advertising cookies under PECR.
It also gives you a degree of brand safety. Choosing and excluding topics shapes the surroundings your ads appear in, which matters for regulated sectors and for any brand that does not want to sit next to the wrong story.
Common mistakes
- Choosing a top-level topic that is far too broad. Business and Industrial covers millions of pages, most of them nothing to do with your service.
- Assuming topics limit where ads go when optimised targeting is switched on. That feature can show ads beyond your selections.
- Never opening the report of where ads actually showed. Mobile games and made-for-advertising sites often slip in under respectable topics.
- Stacking topics, audiences and placements in one ad group until the reach is too small to deliver.
- Judging it on clicks alone. Display clicks are cheap and plentiful; enquiries and sales are the measure.
How to act on it
Start with two or three narrow topics that closely match what your buyers read, each in its own ad group so you can compare results. Decide whether optimised targeting should be on, and record that choice. After the first week, check where your ads appeared and add poor sites and apps as exclusions. Keep the topics that bring conversions at an acceptable cost and drop the rest.
For many small UK businesses, topic targeting works best as support for search, reaching people earlier in their research. Planning display and video targeting so it adds to what search already does is part of my PPC management work.