Google Ads Negative Keywords: 7 Essential Tips

Hey! If your Google Ads account has ever burned through budget on clicks that were never going to turn into a sale, this one is for you.

Picture this. Your campaign looks healthy, impressions keep climbing, clicks keep rolling in, but sales barely move. Open the search terms report and you will usually find the real story: people searching for things you do not sell, cannot afford, or were never going to buy from you anyway. Google Ads negative keywords exist to close exactly that gap, and getting them right is one of the fastest ways to make an existing budget perform better without spending anything extra.

Google Ads negative keywords are terms and phrases you add to a campaign or ad group specifically so your ad will not show when someone searches for them. Think of them as a filter sitting between the keywords you are actively bidding on and the live auction, catching searches that are close enough to trigger a match but wrong enough to waste the click.

A plumbing company bidding on "drain cleaning" does not want to show up for "how to unclog a drain yourself." Negative keywords are how you teach the system that distinction without touching a single bid.

They can live at three levels inside an account: the whole account, a single campaign, or one ad group, and each level solves a different problem, covered shortly.

Setting up Google Ads negative keywords correctly starts with match type, since broad, phrase, and exact behave differently and change how much traffic gets blocked. Broad match is the default: it blocks a search only when every word in your negative appears somewhere in the query, in any order, per Google's own Ads Help documentation.

Phrase match tightens that by requiring the words to appear in the same order, though extra words can still surround them. Exact match is the strictest of the three, blocking only that specific search with nothing added before or after it, as the table below shows.

Getting this right partly comes down to understanding how the Google Ads auction actually decides which ads are even eligible to compete for a given search, since a well placed negative removes you from that competition entirely rather than just lowering your rank in it.

Match Type	Written As	Blocks This Search	Still Shows For
Broad match	running shoes	blue running shoes, shoes running	running shoe, blue tennis shoes
Phrase match	"running shoes"	blue running shoes	shoes running
Exact match	[running shoes]	running shoes (only)	blue running shoes

Typing the same Google Ads negative keywords into ten different campaigns, one at a time, is exactly the kind of busywork negative keyword lists were built to remove. A negative keyword list is a single reusable set of exclusions you can apply to as many campaigns as you want, and updating the list once updates every campaign that uses it, per Google's documentation on negative keyword lists.

Google also offers a separate, account wide layer called account level negative keywords, set once in Account Settings, that automatically apply to all eligible Search and Shopping inventory without being attached to any single campaign. Independent consultant Nils Rooijmans documented this option rolling out, noting it supports broad, exact, or phrase match like any other negative, per his write up on account level exclusions.

A good shared list usually covers terms that have nothing to do with your business at all: "free," "jobs," "DIY," and "refund" are common starting points, saved once and reused everywhere rather than rebuilt per campaign.

Negative keywords also differ by where you place them. A campaign level negative blocks a search across every ad group in that campaign, while an ad group level negative only blocks it for that one ad group, leaving the rest untouched.

This matters most when a campaign is split into tightly themed ad groups by product line. If one ad group targets "wedding photography" and another targets "newborn photography," adding "wedding" as an ad group level negative on the newborn ad group stops wedding searches from leaking in, without touching the wedding ad group at all.

A practical way to think about Google Ads negative keywords is as layers, broadest to narrowest: a shared list first, campaign level negatives second, and ad group level negatives last, so overlapping match types never trigger the wrong ad group.

A common proactive habit is adding the exact match version of every ad group's own keywords as negatives on every other ad group in that campaign, which keeps tightly related ad groups from quietly stealing each other's traffic.

The search terms report shows the real, literal queries that triggered your ads, different from the keywords you actually bid on. It is the best place to find your next negative, because it shows exactly what Google already decided was a close enough match.

A weekly or biweekly pass through this report, sorted by cost or by clicks with zero conversions, usually surfaces the worst offenders fast. Anything irrelevant or clearly a different intent than your offer is a candidate for exclusion.

Go further than a one by one read, and build a pivot table instead: each search term as a row, a count of ad groups it appears in as the value. A term spread across many ad groups is usually a sign your Google Ads negative keywords need to move up a level, from an ad group into the campaign or the shared list.

Negative keywords are simple in concept and easy to get wrong in practice, and the mistakes almost always cost money quietly rather than obviously.

The most damaging mistake is a direct conflict between a negative keyword and a keyword you are actively bidding on. PPC blog Karooya points out that adding a negative which matches one of your own bidded terms will quietly block that keyword from showing, often with no clear warning in the interface, per its rundown of common negative keyword mistakes.

Over blocking is the second most common mistake with Google Ads negative keywords. A broad match negative added casually can remove far more legitimate traffic than intended, so test a phrase or exact match version first on anything you are not completely sure about.

A string of irrelevant clicks does not just waste spend either. It drags down the click through rate on that ad group, which can quietly pull down your Quality Score over time, making every future click in that ad group more expensive than it needs to be.

Performance Max is where negative keyword support genuinely differs from Search, and it is worth understanding exactly where the limits sit rather than assuming it behaves identically.

Account level negative keywords, set once in Account Settings, automatically apply to Performance Max the same way they apply to Search and Shopping, which is currently the most reliable way to block a term across every Performance Max campaign in the account at once, per Google's help page on negative keywords in Performance Max.

Campaign specific negatives in Performance Max had a real, documented limitation worth knowing about. They originally required contacting a Google representative and were capped at only 100 terms per campaign, until Google raised that cap to 10,000, matching Search campaigns, after advertisers pushed back on the original limit, as reported by PPC Land.

Negative keyword lists, the shared sets that work so well across Search campaigns, remain a newer and uneven part of the picture. Search Engine Land reported advertisers seeing list options appear inside Performance Max settings while Google's own help documentation had not yet confirmed full support everywhere, a feature rolling out unevenly rather than all at once, per its coverage of negative keyword lists being tested in Performance Max.

One real limitation has not changed: Performance Max negative keywords, at every level, only apply to Search and Shopping inventory inside that campaign, not to Display, video, or other automated placements, so a negative alone will never fully stop an unwanted placement outside those two inventory types.

If you are deciding how much manual control you actually need, compare Search campaigns against Performance Max before committing budget. Our step by step guide to optimizing a Performance Max campaign covers where negatives fit alongside audience signals and asset groups.