Running ads
Why is my ad showing for searches I never picked?
The short answer
Because you never picked them. Google assigns broad match to every keyword by default, so your ads can show on searches related to your keyword rather than only the ones you typed. On top of that, all match types match close variants, and Google says there is no way to opt out.
This is the most common surprise for anybody who opens their advertising account for the first time and actually reads it. You added a list of keywords. You are being charged for searches that are nowhere on that list.
Nothing has gone wrong. The system is built this way, and two separate mechanisms are doing it. One of them you can change. The other one, by Google's own statement, you cannot.
The mental model most people arrive with is that a keyword is a filter: you name the searches you want, and those are the searches you get. That has not been true for years. A keyword is closer to a description of the customer you are after, and the platform decides which real searches fit that description.
Broad match is switched on unless somebody deliberately changed it
Keywords come in three match types, and the difference between them is how far the platform may wander from the words you wrote.
Google describes them plainly. Broad match means ads may show on searches related to your keyword, which Google says can include searches that do not contain the direct meaning of your keywords. Phrase match means ads may show on searches that include the meaning of your keyword. Exact match means ads may show on searches with the same meaning or same intent as the keyword.
Then comes the line that explains most surprised invoices. Google states that broad match is the default match type that all your keywords are assigned, because it is the most comprehensive.
Default is the important word. It means nobody has to choose broad match for it to be running. If whoever set up the account added keywords and moved on, every one of them is broad. That word is Google's, and it is accurate. But broad coverage and relevant coverage are not the same thing, and you pay for the difference.
Broad match also draws on information that has nothing to do with your keyword list. Google names three inputs: the recent search activity of the person searching, the content of your landing pages and assets, and the other keywords in the ad group. So a thin landing page, or one stray keyword sitting in the wrong ad group, can pull your ads toward searches you would never have chosen.
Close variants apply to every match type, and there is no opting out
Even exact match is not literally exact.
Google defines close variants as allowing keywords to match searches that are similar but not identical to the targeted keyword. Its own list of what counts is wider than most people expect: misspellings, singular and plural forms, stemmings, abbreviations and accents; reordered words with the same meaning; added or removed function words such as prepositions and articles; implied words; synonyms and paraphrases, such as bathing suits matching swimming suits; and searches with the same intent, such as free copyright images matching royalty free images.
On whether you can decline this, Google is unambiguous. By default, all keyword match types are eligible to match to close variants, and in Google's own words, "There's no way to opt out."
That sentence is worth sitting with, because it sets a hard limit on what any account can do. Tightening match types reduces the wandering. It does not end it. Anybody who tells you they can lock your ads to an exact list of searches is describing a product that does not exist.
The search terms report shows the damage, but not all of it
One report answers this question with evidence instead of theory, and it is the first place to look.
Google describes the search terms report as a way to see how your ads performed when triggered by actual searches. It also draws the distinction this whole problem rests on: a search term is what a person entered, while a keyword is what an advertiser added to an ad group. Two different lists. The report is where you see how far apart they drifted, and what each gap cost.
Here is the shape of it. An account spending 4,000 dollars in a month pulls the report and finds 60 search terms. Twelve of them, totalling 900 dollars, are people hunting for jobs, free advice, or a product the business does not sell. That is roughly 22 percent of the month gone before anybody has argued about a bid. Treat those figures as an illustration rather than a benchmark, because the only numbers that matter are the ones in your own report.
One caveat keeps this honest. Google states that some search terms without enough query activity are omitted from the report to keep with its standards on data privacy. So the report is a large sample of where your money went, not a complete ledger of it. If you add up the cost column and it does not reconcile with your total spend, that is why.
Negative keywords are the fix, and they have a trap in them
The tool for this is the negative keyword, which tells the platform not to show your ad when a search contains a particular word. Google describes them as a way to exclude search terms so you can focus on the keywords that matter to your customers. Used steadily, they are the cheapest improvement available in any account, because every block is money that stops leaving.
Now the trap, and it is why accounts leak for years while somebody is nominally maintaining them. Negative keywords do not behave like the keywords you bid on. Google states directly that negative keywords will not match close variants or other expansions, and that you need to add synonyms and singular or plural versions yourself if you want those excluded.
Read those two facts next to each other. Your positive keywords expand automatically and cannot be stopped from expanding. Your negative keywords do not expand at all. The system widens by default and narrows only by hand.
In practice that means blocking the word free has not blocked freebie. Blocking job has not blocked jobs. A negative list with twenty careful words on it can still be letting a hundred variations through.
Two smaller details matter if you advertise in more than one place. Google offers negative broad, negative phrase and negative exact for Search campaigns. Microsoft documents two types, exact and phrase, and says phrase is its default. So one list pasted into both platforms does not block the same searches on both. Microsoft also publishes a negative keyword conflict report, because a word added as a negative while also being used as a keyword cancels that keyword out, which means an account can be bidding on a term and blocking it at the same time.
What to check this week
You do not need to learn the platform to get value out of this. Four questions get you most of the way.
- Pull the search terms report for last month, sorted by cost, and read the top twenty lines. The waste is recognisable immediately, because it is written in ordinary words.
- Ask what match types the keywords are set to. If nobody has ever changed them, they are broad.
- Ask when a negative keyword was last added, and what prompted it. A negative list that has not changed since the account was built is the clearest sign nobody is watching.
- Check whether plurals, common misspellings and synonyms of your main exclusions are on the list, because they are not covered automatically.
If the answers are uncomfortable, the problem is almost never that the platform is broken. It is that the default settings are working exactly as designed, and nobody has been narrowing them.
Managing search accounts is one of the things we do, so if you would rather have somebody read that report with you, that is work we take on.
Terms used on this page
Sources
- About keyword matching options
- Keyword close variants: Definition
- About the search terms report
- About negative keywords
- Negative Keywords (Microsoft Advertising)
Last reviewed 2026-09-11.