Google Ads Negative Keywords: Match Types and Setup

Google Ads negative keywords are words and phrases you tell Google Ads not to show your ads for, so that searches you do not want stop triggering your ads and spending your budget. You add them at the ad group, campaign or account level, or in a reusable list, and you choose a match type for each one. The best source for new negatives is the search terms report, which shows the queries that actually triggered your ads.

What Google Ads negative keywords are

A regular keyword tells Google Ads which searches you want to appear for. A negative keyword does the opposite: if a search matches the negative according to its match type, your ad does not show. The standard use is to remove irrelevant traffic. A recruitment agency does not want to pay for clicks from people looking for jobs. A dental clinic selling implants may not want clicks from people searching for "dental school" or "dentist salary".

Negative keywords are not a one-off setup task. Every keyword match type, especially broader ones, can let in searches you did not expect, and the list of exclusions grows as you read real search data. Think of them as the filter that keeps your keyword list honest.

Negative keyword match types

Negative keywords use broad, phrase and exact match, but the behaviour is different from regular keywords, and this is where most mistakes start. According to Google's Help documentation, the behaviour is as follows.

Broad match negatives

This is the default. Your ad will not show if the search contains all of the negative keyword's terms, in any order. If only some of the terms are present, the ad may still show. For example, the negative "free trial" in broad match blocks "trial free tool" because both words are present, but it would not block a search that contains only "free".

Phrase match negatives

Your ad will not show when the search contains the negative keyword's terms in the same order, even if there are extra words before or after them. Phrase match is the safer choice when you want to block a specific expression without blocking every search that happens to include one of its words.

Exact match negatives

Your ad will not show only when the search is precisely the negative keyword, with no extra words. Exact match is the narrowest option and is useful when one query is a problem but its longer variations are fine.

Close variants do not apply to negatives

Google's Help page says negative keywords do not match close variants. Google's own example: if you add the broad negative "flowers", ads are not eligible for "red flowers" but can still show for "red flower". Synonyms and singular or plural forms must be added by hand if you want them excluded. Google adds that negatives do account for casing and misspellings automatically. This is the reverse of how positive keywords behave and is a common reason that unwanted traffic keeps appearing after a negative was added.

There is also a documented edge case with long searches: ads may still show for searches longer than 16 words if the negative keyword appears after the 16th word. This is rare in practice, but it is a reminder that negatives are not an absolute guarantee.

Where negative keywords can be added

Google Ads lets you add negative keywords at several levels, and the right level depends on how widely the exclusion should apply.

• Ad group level. Applies only to that ad group. Useful when two ad groups in the same campaign should not compete for each other's searches.
• Campaign level. Applies to every ad group in the campaign. The usual home for exclusions that apply to the whole campaign's purpose.
• Account level. Google's documentation says account-level negative keywords apply automatically to all eligible Search and Shopping inventory in the account. Use it only for words you never want to match anywhere in the account.
• Negative keyword lists. A reusable list that you attach to several campaigns, so one edit updates all of them.

The practical rule is to put an exclusion at the lowest level where it is always true, and move it up only when it is always true everywhere. A word like "jobs" is a good candidate for a list or the account level for most commercial businesses. A product term that is a negative in one campaign but a target in another belongs in the campaign or ad group that needs it.

How to find negative keywords in the search terms report

The search terms report shows the actual queries that triggered your ads, along with the performance of each. Google's Help documentation advises that if a search term is not relevant enough to the products or services you offer, you should add it as a negative keyword. The steps below are a repeatable routine.

1. Open the search terms report for the date range you want to review, and make sure it covers enough days to show a pattern.
2. Sort by cost or clicks so the terms that consume budget appear first.
3. Mark each term as relevant, irrelevant or unclear. Do not decide on cost alone; a term with spend and no conversions can still be relevant to your business.
4. For irrelevant terms, decide whether the problem is a single word, a phrase or a whole query.
5. Choose the match type: broad for a word that is never wanted, phrase for an expression, exact for a single bad query.
6. Choose the level: ad group, campaign, list or account.
7. Record what you added and the date, so you can check later whether volume or conversions changed.

A single word can hide several meanings. If the search terms report shows "apple repair jobs", "apple repair course" and "apple repair price", the first two suggest "jobs" and "course" as negatives, while the third is the traffic you want. Reading the full query before choosing the negative is what prevents over-blocking.

A worked example (illustrative numbers)

The figures here are invented to show the reasoning and are not benchmarks. Suppose a Bangkok accounting firm runs a campaign on the keyword "accounting services" and, after a fortnight, the search terms report shows these queries: "accounting services for small business", "accounting jobs", "free accounting software", "accounting course online" and "accounting services price".

Two of those are the target audience, and three are not. The firm adds "jobs" and "course" as broad negatives at the campaign level, because those words are never wanted. For "free accounting software" it adds "software" as a phrase negative only after checking that no valid query would include it, since the firm does not sell software. "free" is more delicate, because the firm might offer a free first consultation; blocking it at broad match could remove real leads, so the firm leaves it out for now and re-reads later reports.

That last decision is the point. A negative keyword is a permanent exclusion until someone removes it, and the cost of a wrong negative is lost leads that you never see in your reports.

Common mistakes that block good traffic

• Adding a broad negative for a word that appears in good queries. A negative such as "free" can block "free consultation" if that is something you offer.
• Adding a negative that conflicts with your own keyword. If a negative contains terms that match a keyword you are bidding on, that keyword can stop showing. Re-check keyword and negative lists together after any large edit.
• Assuming synonyms are covered. Negatives do not match close variants, so plurals and synonyms need their own entries.
• Using account-level negatives too freely. An account-level negative applies across all eligible Search and Shopping inventory, so a word that is only unwanted in one campaign should not live there.
• Adding negatives from too little data. One click on a strange query is a weak basis for a permanent exclusion.
• Never reviewing the lists. Offers change, and a negative that made sense a year ago can now block a product you launched.
• Treating negatives as a substitute for tighter keywords. If you are adding dozens of negatives per week, the underlying keyword match types may be too broad.

What this means for Thai marketers

This section is analysis. Google's documentation describes negative keywords in general terms, and it does not make Thailand-specific statements. Applying the mechanics to Thai-language campaigns raises a few practical points.

Thai is written largely without spaces between words, and Thai searchers often mix Thai and English terms. That makes the search terms report more important, because the same intent can appear in several written forms. Since negatives do not match close variants, Google says negatives already account for casing and misspellings, but a transliteration of an English word, or a synonym written in Thai, is a different term and needs its own entry. Read the report in Thai, not only through a translation tool, so you can see the alternate forms.

Businesses serving both Thai and English audiences should check negative keyword lists per language. A word that is irrelevant in English can have a different meaning in Thai, so avoid sharing one list across campaigns in both languages without reviewing it. The same care applies to location terms: if you serve a specific area, review whether searches naming other places are waste or just a different route to the same customer.

For campaigns that cover several services, make sure each campaign excludes the searches that belong to its siblings, so the right ad shows for the right query. A properly managed Google Ads account reviews these overlaps regularly, and a clear campaign structure under Search campaign management makes the exclusions easier to maintain.

A simple negative keyword routine

A routine matters more than a perfect list. A sensible rhythm is to review the search terms report soon after launch, when the data is most revealing, then at a regular interval that fits your spend. Keep a short log of each addition with its match type, level and reason. When a campaign's performance changes, check whether a recent negative could be responsible before looking elsewhere.

If your search traffic includes people who have visited your site before, you may also want to look at remarketing so that the right messages reach the right audiences, rather than trying to solve audience problems with exclusions alone.

What negative keywords cannot do

Negative keywords only remove searches that match them. They do not make ads more relevant, they do not fix a weak landing page, and they cannot catch every unwanted query, because the set of possible searches is huge and new phrasings appear constantly. They also cannot see intent: a negative blocks a word, not a motive. Use them alongside well-structured ad groups, focused match types and conversion tracking, not instead of those things.

Google Ads negative keywords FAQ

What is a negative keyword in Google Ads?

A negative keyword is a word or phrase that prevents your ad from showing on searches that match it. You add negatives to stop irrelevant searches from spending your budget.

Do negative keywords match close variants?

No, Google's Help documentation says negative keywords do not match close variants. If you want to exclude synonyms or singular and plural forms, you need to add them separately.

What is the difference between broad, phrase and exact match negatives?

Broad blocks searches containing all the negative terms in any order, phrase blocks searches containing the terms in the same order with other words allowed, and exact blocks only the precise query. Broad is the default and the easiest to misuse.

Should I add negative keywords at the account level or the campaign level?

Use the account level only for words you never want to match anywhere in your Search and Shopping inventory, and use the campaign or ad group level for exclusions that are specific to one purpose. A reusable negative keyword list is useful when several campaigns share the same exclusions.

How do I find new negative keywords?

Review the search terms report, which lists the queries that triggered your ads. Add a term as a negative when it is not relevant to your products or services, after reading the full query and choosing the narrowest match type that does the job.

If you would like help auditing search terms, structuring exclusions and keeping them current, Relevant Audience can support you through its Google Ads service.