Pull up your Search Terms report right now. Filter for any 90-day window and sort by cost, highest to lowest. Scroll past the first page of terms you actually want to show up for.
What you find on page two — and three, and four — is money you already spent and will never get back. Irrelevant queries, research-intent searches, job seekers, students, competitors, tire-kickers. In the accounts we audit, that waste routinely runs between 20% and 40% of total monthly spend. On a $10,000/month budget, that’s up to $4,000 gone before a single real buyer even clicked.
A sharp Google Ads negative keywords strategy is the unglamorous, unsexy, highest-ROI task in all of paid search. Most people treat it like a chore you do once when you launch. The accounts that consistently outperform their competitors treat it like a living system.
Here’s how to build that system.
- Most accounts waste 20–40% of budget on irrelevant queries — negative keywords are the fastest way to recover that spend without touching your bids or budgets.
- The three negative match types (broad, phrase, exact) behave very differently; using the wrong one can accidentally block the traffic you actually want.
- Shared negative lists are one of the most underused features in Google Ads — they let you apply exclusions across every campaign simultaneously, and most advertisers ignore them entirely.
- Negative keyword research isn’t a launch task — it’s a weekly habit. Accounts that review search terms every 7–14 days consistently outperform those that check monthly or less.
- There are five categories of waste terms you should build exclusions for proactively, before they cost you a single dollar.
Why Most Negative Keyword Lists Are an Embarrassment (And Not the Account Manager’s Fault)
Here’s the dynamic we’ve seen play out hundreds of times: an account launches with a reasonable initial negative keyword list built during setup. The campaign runs. The team checks conversion volume and ROAS. Nobody touches the search terms report for six weeks because “the numbers look okay.”
Meanwhile, Google’s broad match and close variant matching — which has gotten progressively more liberal with every passing year — is quietly serving your ads against queries you’d never consciously choose. Your roofing company shows up for “roofing nail gun reviews.” Your B2B SaaS product gets clicks from college students writing papers about the industry. Your HVAC company pays for “HVAC certification courses.”
None of those clicks convert. All of them cost money. And they don’t show up in your conversion data as failures — they just disappear into the sea of zero-conversion clicks that make your account look less efficient than it should be.
This is especially brutal if you’re running broad match keywords, which have the widest query expansion. Broad match can work — we use it regularly in mature accounts with strong conversion history — but only when it’s running against a tightly maintained negative keyword list. Without one, broad match is a fire hose aimed at your budget.
The Three Negative Match Types — And How to Use Each One Without Breaking Your Campaigns
This is where people get into trouble. They hear “add negative keywords” and start bulk-adding everything as negative broad match, then wonder why their impressions fell off a cliff. Negative match types are not interchangeable.
Negative Broad Match
Your ad won’t show when the search contains all of the words in your negative keyword, in any order. It’s the least restrictive of the three. Use it for individual words you never want associated with your ads — “free,” “DIY,” “cheap,” “cheap” — words that signal the wrong intent regardless of what surrounds them.
Be careful with multi-word negative broad terms. If you add negative broad for “plumbing school,” your ads can still show for “plumbing school tips and certification” because Google looks at whether all words are present — not whether the phrase is present.
Negative Phrase Match
Your ad won’t show when the search contains the exact phrase in that order. This is the workhorse of most well-run negative keyword strategies. Use it for clearly irrelevant intent patterns: “how to,” “what is,” “for sale used,” “free download,” “job,” “career,” “course,” “training,” “certification.” Phrase match gives you precision without the nuclear option of exact match.
Negative Exact Match
Your ad won’t show only when the search is precisely that query, nothing added or removed. This is the scalpel. Use it when you want to block a specific query that’s high-volume and clearly wrong — but you don’t want to accidentally sweep up related queries you do want. For example, a criminal defense law firm might add [criminal justice] as a negative exact match to block that specific research query without blocking “criminal defense attorney” variations.
The most common mistake: adding competitor brand names as negative broad match. If you’re running a competitor campaign and you add competitor brand as negative broad, you might accidentally suppress your own competitor campaign if the logic overlaps. Use negative exact match for competitor names when precision matters.
The Five Categories of Wasted Spend You Should Exclude Before You Even Launch
Good negative keyword research isn’t just reactive — it’s proactive. Before you spend your first dollar, these five buckets should already be in your negative list.
1. Job and Career Intent
Words like “jobs,” “careers,” “salary,” “hiring,” “resume,” “apprenticeship,” “work for,” “employment.” If you sell anything to businesses or consumers, you don’t want job seekers. Build a master exclusion list and apply it everywhere.
2. DIY and Educational Intent
“How to,” “tutorial,” “guide,” “what is,” “definition,” “course,” “certification,” “training,” “learn,” “school,” “degree.” These searchers want information, not to buy. They’ll happily click your ad, spend 4 seconds on your page, and bounce. Your bounce rate goes up; your Quality Score goes down; your CPCs go up. Everyone loses.
3. Free and Discount Signals
“Free,” “free trial” (if you don’t offer one), “open source,” “cheap,” “cheapest,” “lowest price,” “discount code,” “coupon,” “promo code.” These terms don’t just signal price sensitivity — they signal a buyer who is specifically shopping against you on price and will churn the moment they find something cheaper.
4. Wrong Product or Industry Overlap
If you sell commercial HVAC equipment, you need to exclude residential terms. If you’re a B2B software company, exclude consumer-facing queries. Think hard about adjacent industries or use cases that share your keywords but represent totally different buyers. This requires knowing your product — Google won’t figure it out for you.
5. Research and News Queries
Words like “news,” “statistics,” “report,” “study,” “Wikipedia,” “history of,” “example of.” Researchers don’t buy things. They read things. Block them early and stop paying for their homework.
Building this proactively — before launch — is one of the fastest wins you can deliver for a new account. We cover this in detail as part of our broader approach to reducing Google Ads wasted spend, where negative keywords consistently show up as the single highest-leverage intervention across account types.
Shared Negative Lists: The Most Underused Feature in Google Ads
Here’s a feature that’s been in Google Ads for years and is ignored by the majority of advertisers: shared negative lists (found under Tools & Settings → Shared Library → Negative Keyword Lists).
Instead of adding negative keywords individually to each campaign, you build a list once and apply it to every campaign in your account simultaneously. When you discover a new irrelevant query in one campaign, you add it to the shared list — and it’s automatically excluded everywhere.
This changes everything about how you manage exclusions at scale.
How to Structure Your Shared Negative Lists
Don’t build one giant list and apply it to every campaign. That’s a good way to accidentally suppress campaigns that might legitimately want some of those terms. Instead, use a tiered structure:
Master exclusion list: Universal terms that should never appear for any campaign — job terms, free terms, DIY terms, competitor names you never want to appear for. Apply to every campaign in the account.
Campaign-type lists: If you run both brand campaigns and non-brand campaigns, you’ll want different exclusions. Brand campaigns might need very few exclusions because the query intent is already tight. Non-brand campaigns need aggressive exclusion by category.
Product or service lists: If you have multiple product lines that could cannibalise each other, use shared lists to keep traffic in the right campaigns. If you’re an agency managing multiple clients, you can’t share lists across accounts — but you can replicate the structure using templates.
For anyone managing campaigns across multiple locations or business units, this tiered shared list approach is a lifesaver. It pairs naturally with a clean account structure — which is why we always address negative lists when we discuss Google Ads account structure best practices. The two go hand in hand.
The Search Terms Report Audit Routine That Actually Keeps Waste Low
The biggest mistake people make with negative keywords isn’t adding the wrong ones. It’s stopping after launch and never reviewing the Search Terms report again.
Google’s query matching evolves. New queries emerge. Seasonal events create new search patterns. A campaign that was clean six months ago can silently accumulate waste over a quarter. You need a cadence.
Weekly: High-Spend Campaigns
Any campaign spending more than $1,500/month deserves a weekly Search Terms audit. Sort by cost descending. Look for anything in the top 20 queries that surprises you, looks off-intent, or generates clicks with zero conversions at a cost above your target CPA. Add negatives the same day — don’t let waste compound.
Every Two Weeks: Mid-Tier Campaigns
Campaigns in the $500–$1,500/month range. Same process, slightly longer cycle. You’re not losing as much per bad day, but you still need to look.
Monthly: Lower-Spend or Brand Campaigns
Brand campaigns have tighter query matching by nature and need less frequent audits. But still look. We’ve seen brand campaigns show up for competitor terms, typos of completely unrelated brands, and generic terms that should be running in separate non-brand campaigns instead.
What to Look for Beyond Just “Bad Queries”
Your Search Terms report also tells you what’s working. High-click, high-conversion terms that aren’t already in your keyword list as exact or phrase match are signals to add them as positive keywords — so you can bid on them directly and stop relying on match type expansion to capture them.
The Search Terms report is one of the most information-dense tools in the platform when you know how to read it. There’s a full breakdown of how to actually use the Google Ads Search Terms report that goes deep on both the negative keyword angle and the positive keyword mining angle — worth reading alongside this one.
Advanced Negative Keyword Research: Going Beyond the Search Terms Report
Reactive auditing — blocking terms after they’ve already cost you money — is necessary but not sufficient. The best negative keyword research is proactive.
Use Keyword Research Tools Offensively
When you do keyword research for a new campaign, you’re not just looking for terms to bid on. You’re looking for terms to exclude. Run your core keyword themes through Google Keyword Planner, Semrush, or Ahrefs and look at the broad related terms. Any high-volume adjacent terms that are clearly wrong-intent go straight into your pre-launch negative list.
If you’re bidding on “project management software,” your keyword research will surface terms like “project management certification,” “project management courses,” “project manager salary,” and “project management templates free.” All of those should be negatives before you spend a dollar.
Mine Competitor and Industry Forums
Reddit, Quora, and industry forums are goldmines for understanding what people are searching when they’re researching your industry — but not ready to buy. If your target buyer community has active forums, spend 30 minutes reading how people phrase their questions. Those phrasings often become negative phrase match exclusions.
Think About Your Keyword List Interactions
If you’re bidding on both “plumber” and “plumbing” as broad match in the same ad group, you’re eligible to show for a massive range of overlapping queries. Before you even think about positive keyword strategy, map out where those terms could bleed into wrong-intent territory and preemptively block those paths.
This kind of deep keyword thinking pairs well with solid foundational keyword research. If you want to go deeper on the positive side of keyword strategy, our guide to how to do keyword research for Google Ads covers the strategic framework that informs both what to bid on and what to exclude.
The Mistakes That Will Come Back to Haunt You
A few anti-patterns we’ve seen damage accounts — sometimes severely — when negative keyword management goes wrong.
Over-negating with broad match negatives. Adding “service” as a negative broad match when you meant to block “free service” will gut your impression volume. Always double-check what a broad match negative will sweep up before you save it. Test by typing your negative keyword into Google’s Keyword Planner preview and seeing what eligible terms disappear.
Adding your own keywords as negatives. Sounds impossible, but it happens more than you’d think — especially when importing negative lists from external sources or templates. If a negative keyword matches a term you’re actively bidding on as a positive keyword, the negative wins. Your ad stops showing for that term. Always cross-reference before importing in bulk.
Ignoring negative keywords in Performance Max campaigns. PMax is its own beast, and its exclusion management is more limited than standard Search campaigns — but it’s not zero. You can apply account-level negative keywords and work with your rep to add campaign-level exclusions via support ticket. If you’re running PMax without exclusions, you are almost certainly paying for garbage. This is covered in detail in our breakdown of Performance Max best practices.
Never auditing after a match type change. If you switch from exact to phrase, or phrase to broad, your eligible query set expands dramatically. Every match type change should trigger an immediate Search Terms audit — don’t wait for your normal weekly cycle.
Frequently Asked Questions
How many negative keywords should a Google Ads campaign have?
There’s no magic number. A brand-new campaign in a focused niche might run cleanly with 50–100 well-chosen exclusions. A large ecommerce account or a broad B2B software account might have 500+ and still be audited weekly for additions. What matters is that every negative on your list is there for a reason, not just because a template said so. Focus on quality and consistent review over raw count.
What’s the difference between campaign-level and ad group-level negative keywords?
Campaign-level negatives apply to every ad group within that campaign — they’re your broadest filter. Ad group-level negatives are more surgical: they let you block specific terms for one ad group without affecting others in the same campaign. You’d use ad group-level negatives most often when you have multiple ad groups with overlapping keyword themes and you need to funnel specific queries to the right ad group — not block them from the campaign entirely.
Can negative keywords hurt performance by blocking good traffic?
Yes — if you add them carelessly. Overly aggressive broad match negatives are the most common culprit. Before adding any negative, ask: “Am I 100% sure I don’t want to show for any query containing this word?” If the answer isn’t a clear yes, use phrase or exact match instead. And run a before/after check on impression volume after any major negative keyword addition to catch accidental over-blocking early.
How do I find negative keywords I’m missing?
Three sources: (1) Your Search Terms report — sort by cost, look for anything with zero conversions above your target CPA, and look for intent signals that don’t match a buying journey. (2) Keyword research tools — look at what broad-related queries Google associates with your core terms, then filter for wrong-intent ones. (3) Your own sales team — ask them what phrases people use when they’re clearly not a good fit. Those phrases are often exact match negatives waiting to happen.
Should I add competitor brand names as negative keywords?
Only if you’re deliberately choosing not to run competitor campaigns. If you’re bidding on competitor terms (which is a separate, legitimate strategy), adding their names as negatives on those campaigns would be self-defeating. Add competitor names as negatives on your non-brand and branded campaigns to keep traffic clean. Never add them as negative broad match — use exact match so you don’t accidentally sweep up adjacent terms.
Do negative keywords work in Performance Max campaigns?
Partially. You can apply account-level negative keywords to PMax campaigns through the account settings, and Google allows campaign-level exclusions through advertiser support. The controls are less granular than in Search campaigns, which is one of the major criticisms of PMax. If you’re running PMax, setting account-level negatives — at minimum your master exclusion list — is non-negotiable.
If Your Current Google Ads Setup Doesn’t Have a Negative Keyword System — It’s Costing You
Not a list. A system. A pre-launch exclusion framework, a tiered shared negative list structure, a weekly Search Terms audit cadence, and someone whose job it is to make sure queries that have no business seeing your ads never see them again.
That system is what separates accounts where efficiency compounds over time from accounts that slowly drift into waste while the reporting still looks “fine” because overall conversion volume is holding steady.
If you’ve inherited an account that hasn’t had a serious negative keyword audit in more than 30 days, that’s the first place we’d start. Run a 90-day Search Terms pull sorted by cost. Calculate how much you spent on queries with zero conversions. That number is your baseline for how much a proper negative keyword strategy could recover — without changing a single bid, budget, or ad.
If you’d like a second set of eyes on what your Search Terms report is actually telling you, our step-by-step Google Ads account audit framework walks through exactly how to diagnose waste across every layer of an account — negative keywords included. It’s the same process we run for every new client before we touch a single campaign setting.