Negative keywords in Google Ads: the match type trap

Negative keywords stop your Google Ads showing for searches you don’t want, like people looking for jobs or for something you don’t sell. Most mistakes with them come from one assumption: that negative keyword match types work like the match types on the keywords you bid on. They don’t. Your normal keywords stretch to cover plurals, close variants and related searches, but a negative only blocks the words you give it, in the way its match type says. Get that wrong and you keep paying for clicks you thought you’d blocked, or you block searches you wanted without noticing.

The trap: negatives don’t stretch like keywords

When you bid on a keyword, Google matches it to more than the words you typed. Broad match reaches related searches, and even exact match covers close variants, such as plurals and searches that mean the same thing.

Negative keywords don’t do that. Google says they won’t match close variants or other expansions, so if you want to block singular and plural versions or synonyms, you have to add each one. A negative for job won’t stop searches for jobs.

The one exception is newer than a lot of the advice you’ll find online. Google now says negatives automatically account for casing and misspellings, so you don’t need to add those separately.

Negative keyword match types, side by side

Say you run an accountancy firm and don’t want to pay for clicks from people looking for accountancy jobs. You add the negative accountant jobs. The table shows which searches each match type would block.

• Negative broad is the default. It blocks a search that contains all your words, in any order, even with other words around them.
• Negative phrase blocks a search that contains your words together and in the same order. Words before or after don’t matter.
• Negative exact blocks only that exact search. Add one word, and your ad can show again.

Look at the last two rows. Nobody searching accountant job or accountancy jobs wants to hire an accountant, but none of the three negatives stops them. A simpler fix for most firms would be job and jobs as broad negatives, after checking those words don’t turn up in searches they want.

On searches longer than 16 words, your ad might still show if the negative comes after the 16th word, which explains the odd stray search term in your report. All of this applies to Search. In Display and Video campaigns, every negative keyword is treated as broad match and Display uses them to exclude whole topics, so placement and content exclusions usually work better there.

Which match type should you use?

Start with the search you want to block, then pick the narrowest match type that blocks it. It’s easy to widen a negative later if more searches slip through. Blocking too much is harder to catch, because blocked searches never appear in your reports.

Finding negatives in your search terms report

Base your negatives on searches you’ve paid for rather than on guesses. The search terms report lists them.

1. Sort by cost.Open the search terms report and start with the searches that cost the most. Look for any that don’t fit what you sell.
2. Look for patterns.If one unwanted word keeps appearing, it may be better to block the word than each search that contains it.
3. Check what else uses the word.Before blocking a short or common word, filter the report for it and see which good searches it would catch too.
4. Add it at the right level and match type.You can add a negative straight from the report, then choose its match type and where it applies.
5. Write down why.A one-line note on why each important negative was added, and where, saves time when someone asks why a search has gone quiet.

Common negatives to consider, and check first

The same themes turn up in most accounts. Use these as prompts when you review your search terms, rather than pasting them in as they are.

• Jobs and careers: jobs, job, careers, vacancies, salary, apprenticeship. Unless you’re recruiting.
• Training: course, training, qualification, how to become. Unless you sell training.
• Free and DIY: free, DIY, template. Take care here, because searches such as free quote or free trial can be some of your best.
• Second-hand: used, second-hand, refurbished, if you only sell new.
• Wrong meaning: words that share a name with something else. Google’s own example is an optician who sells glasses adding negatives for wine glasses and drinking glasses.
• Places you don’t cover: towns or regions outside your area, where your location settings alone aren’t catching them.

Account, shared list, campaign or ad group?

The match type controls which searches a negative blocks. The level you add it at controls which campaigns it applies to.

You can also use negatives to steer a search to the campaign it belongs in. Block it in the campaigns where it doesn’t fit, and leave it open in the one where it does. Before you attach a shared list to a campaign, check that the campaign really needs every exclusion on it.

Negative keywords in Performance Max and AI Max

Performance Max used to give you very little say over search terms, until campaign-level negatives arrived in 2025. Google has since raised the limit from 100 to 10,000 per campaign, and you can now apply negative keyword lists across Performance Max campaigns as well. Account-level negatives already applied to them. In Performance Max, negatives only affect Search and Shopping inventory, so they won’t keep your ads off YouTube or Display placements.

If you use AI Max for Search, which finds searches beyond your keyword list, Google confirms that negative keywords are still respected. Because AI Max reaches searches you never added, your negatives do more of the work of deciding what you pay for. We cover the other guardrails it needs in why Google AI Max needs guardrails.

How to check you haven’t blocked good traffic

Wasted clicks show up in your search terms report, but over-blocking doesn’t, because a search you’ve blocked never appears there. A bad negative usually just shows up as fewer impressions or conversions, with nothing obvious to explain the drop.

• Check for clashes with your own keywords. Google warns that a negative that overlaps one of your keywords will stop that ad showing.
• Watch the next couple of weeks. After a big change, keep an eye on impressions, clicks and conversions. If good traffic drops, check the newest negatives first.
• Review your lists regularly. At least every quarter, and whenever your products, services or campaign structure change. A negative added for something you didn’t sell last year may be blocking something you sell now.
• Narrow before you delete. If a negative is catching good searches, try phrase or exact match, or move it to a single campaign, before removing it altogether.

Negatives only work from the moment you add them. They don’t change past clicks, conversions or reports.

How we can help

When Google Ads is one task among many, the weekly search terms review is often the first thing to slip, and that’s an easy way for media budgets to disappear without anyone noticing. We can do that review for you, sort out your lists and match types, or run your Google Ads altogether. We also work as an extension of in-house teams, so the person who runs your account stays in charge.

Frequently asked questions