The Negative Keywords Masterclass: How 200+ Exclusions Can 3x Your Conversions

TL;DR: One in four Google Ads accounts has zero negative keywords — and it shows. Accounts without negatives convert at 4.6% while accounts with proper negative keyword lists convert at 13% — a 3x difference (PPC Land, 15,000 accounts). Building a 200+ negative keyword list is the single highest-ROI activity you can do in Google Ads. This guide gives you the complete framework, industry-specific templates, and maintenance routine.

Negative keywords are the most underused feature in Google Ads. They cost nothing to add, take minutes to implement, and can eliminate 23-34% of irrelevant traffic overnight. Yet most advertisers either ignore them entirely or add them reactively — one at a time, after the money is already wasted.

This masterclass changes that. You will leave with a comprehensive negative keyword strategy that proactively blocks waste before it happens.

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Why Negative Keywords Matter: The Numbers

Let us start with the data that should make every advertiser uncomfortable.

The Waste Without Negative Keywords

Sources: PPC Land (15,000 accounts), GROAS.ai

The Scale of the Problem

• 25% of Google Ads accounts have zero negative keywords (PPC Land)
• 84% of advertisers use fewer than 50 negative keywords (GROAS.ai)
• The average account wastes $1,127.54/month — negative keywords address the largest chunk of that waste (PPC Land)
• Comprehensive negative keyword management generates 400-800% ROI (GROAS.ai)

What Happens Without Negative Keywords

Here is a real scenario. A plumbing company bids on "plumber" with broad match:

Of 8 clicks, only 2 are relevant. That is 75% waste. The business paid $51.30 but only $17.60 had any chance of converting.

With proper negative keywords (salary, meme, how to become, crack, joke, game, job, openings), those 6 irrelevant clicks never happen. The budget goes entirely to real prospects.

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How Negative Keywords Work

The Basics

A negative keyword tells Google: "Do not show my ad when someone searches for this term." When a search query contains your negative keyword, your ad is suppressed.

Positive keyword: plumber near me (show my ad) Negative keyword: -plumber salary (hide my ad)

Negative Keyword Match Types

Negative keywords have their own match type system, and it works differently from positive keyword match types.

Critical Differences from Positive Match Types

Negative broad match does NOT include:

• Close variants
• Synonyms
• Related searches

This means if you add "plumber salary" as a broad match negative, it blocks "plumber salary" and "salary plumber" but does NOT block "plumber wages" or "plumber pay" or "plumber income." You need to add those separately.

Rule of thumb:

• Use broad match negative for obviously irrelevant terms (free, jobs, DIY)
• Use phrase match negative for specific irrelevant phrases (e.g., "how to become")
• Use exact match negative only when you need surgical precision — blocking one query while keeping close variants active

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Building Your 200+ Negative Keyword List

The most effective approach is to build your negative keyword list in layers: start with universal exclusions, then add industry-specific terms, then refine with data from your search terms report.

Layer 1: Universal Exclusions (50-70 Keywords)

These terms are irrelevant for virtually every service business running Google Ads. Add them before your first ad ever runs.

Job & Career Terms (15-20 keywords)

When someone searches "[your service] salary" or "[your service] jobs," they are looking for employment, not hiring you.

job
jobs
career
careers
employment
hiring
recruit
recruiting
salary
salaries
resume
interview
freelance
contractor jobs
apprentice
apprenticeship
intern
internship
certification
training program

DIY & Educational Terms (15-20 keywords)

These searchers want to learn how to do it themselves — the opposite of hiring a professional.

how to
DIY
tutorial
guide
learn
course
training
class
classes
school
university
college
degree
certification exam
study
homework
thesis
research paper
PDF
template

Free & Discount Seekers (10-15 keywords)

These searches rarely lead to paying customers for service businesses.

free
cheap
cheapest
discount
coupon
deal
bargain
giveaway
sample
trial
volunteer
pro bono
charity
donation

Entertainment & Irrelevant (10-15 keywords)

Searches that have nothing to do with hiring a service provider.

meme
memes
funny
joke
jokes
gif
video game
game
movie
show
TV
wiki
Wikipedia
Reddit
forum
definition
meaning

Layer 2: Industry-Specific Exclusions (50-80 keywords)

These vary by your industry. Here are templates for common service verticals.

Home Services (Plumbing, HVAC, Electrical, Cleaning)

plumber school
plumber license
plumber exam
plumber union
plumber apprentice
plumber tools
plumber snake rental
plumber tape
plumbing code
plumbing diagram
plumbing parts
plumbing supplies store
plumbing fixtures wholesale
pipe fitting specifications
water heater manual
HVAC technician school
electrician school
electrician exam
cleaning products
cleaning supplies
cleaning hacks

Legal Services

law school
bar exam
LSAT
paralegal
legal assistant
legal secretary
law degree
how to sue
sue without lawyer
legal forms free
legal templates
legal aid free
pro bono
public defender
court dates
case law
legal research
law review
legal definition
statute of limitations

Healthcare & Dental

medical school
dental school
nursing school
medical degree
dental hygienist salary
dental assistant school
anatomy
symptoms
diagnosis
home remedy
home remedies
natural cure
natural treatment
WebMD
Mayo Clinic
medical journal
clinical trial
research study
insurance coverage
Medicare
Medicaid

Professional Services (Accounting, Consulting, IT)

accounting degree
CPA exam
accounting software free
QuickBooks tutorial
Excel template
bookkeeping course
tax form
tax calculator free
IRS form
self-filing taxes
TurboTax
H&R Block
consulting framework
consulting case study
MBA
business school
IT certification
CompTIA
coding bootcamp

Layer 3: Competitor & Brand Terms (10-20 keywords)

Unless you have a dedicated competitor targeting campaign, exclude competitor names to avoid waste.

[Competitor 1 name]
[Competitor 2 name]
[Competitor 3 name]
[Major brand names in your industry]
[National chain names you cannot compete with]
Amazon
Walmart
Home Depot
Lowes

Note: If competitors are bidding on YOUR brand name, you may want to bid on theirs. But do this in a separate campaign with its own budget — never mixed with your service campaigns.

Layer 4: Geographic Exclusions (10-20 keywords)

If you serve a specific area, exclude locations you do not service.

[Cities you don't serve]
[States you don't serve]
international
worldwide
overseas
remote
online only
virtual
shipping
delivery
mail order

Layer 5: Data-Driven Additions (Ongoing)

This layer grows over time as you review your Search Terms Report. Every week, you will find new irrelevant queries to add. This is where the list goes from 200 to 300, 400, and beyond.

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N-Gram Analysis: The Advanced Method for Finding Negatives

N-gram analysis is a technique that breaks your search queries into 1-4 word phrases to identify patterns you would miss reviewing individual queries.

What is N-Gram Analysis?

Instead of reviewing each search term individually, n-gram analysis extracts common word patterns across all your queries and measures their aggregate performance.

Example: If you have 500 search terms, n-gram analysis might reveal:

Without n-gram analysis, you would need to review all 500 terms individually. With it, you quickly identify that "salary," "school," and "how" are systematic waste patterns across dozens of queries.

How to Run an N-Gram Analysis

Step 1: Export your Search Terms Report (last 90 days minimum)

Step 2: Use a spreadsheet or script to break each query into individual words (1-grams) and word pairs (2-grams)

Step 3: Sum the impressions, clicks, cost, and conversions for each n-gram across all queries containing it

Step 4: Sort by cost (highest first) and identify n-grams with high spend and zero or near-zero conversions

Step 5: Add wasteful n-grams as negative keywords

Frequency:

• High-volume accounts ($5,000+/month): Run monthly
• Standard accounts: Run quarterly
• New accounts: Run after first 30 days, then quarterly

As Michelle Morgan (Co-Founder of Paid Media Pros) explains: "An N-Gram analysis allows you to see how individual words or short phrases perform in your search queries without having to review multiple different lines of data."

Using Google Ads Scripts for N-Gram Analysis

For accounts spending over $5,000/month, automated n-gram scripts save hours of manual work. Available scripts (like those at ads-scripts.com) can:

• Automatically extract search query data
• Break queries into n-grams
• Calculate performance metrics per n-gram
• Flag potential negative keywords
• Export results to Google Sheets

PPC specialists run an average of 3.8 scripts per account, and 63% of active advertisers use 1-5 scripts (industry survey).

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Negative Keyword Match Type Strategy

Choosing the right match type for your negatives is as important as choosing the right terms.

When to Use Each Type

Common Match Type Mistakes

Mistake 1: Using only broad match negatives

If you add "free" as a broad match negative and someone searches "toll-free plumber number," your ad is blocked — even though "toll-free" is relevant. In this case, use phrase match: "free plumber" or exact match: [free plumber].

Mistake 2: Forgetting that negative broad match does NOT include synonyms

Adding "cheap" as a negative does NOT block "inexpensive," "budget," or "low-cost." You need to add each separately.

Mistake 3: Over-blocking with broad negatives

Adding "water" as a broad negative for an HVAC company might seem smart (you do not do plumbing). But it also blocks "water heater" searches — which HVAC companies often service. Use phrase match: "water damage" instead.

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Shared Negative Keyword Lists

Google Ads allows you to create shared negative keyword lists that apply across multiple campaigns. This is essential for efficiency.

Why Use Shared Lists

• Consistency: Every campaign automatically gets the same exclusions
• Efficiency: Add a negative once, it applies everywhere
• Maintenance: Update one list instead of editing each campaign individually
• Organization: Group negatives by category for easy management

Recommended Shared List Structure

How to Create Shared Lists

1. Go to Tools & Settings > Shared Library > Negative Keyword Lists
2. Click the + button to create a new list
3. Name the list (e.g., "Universal Negatives")
4. Add your keywords with appropriate match types
5. Click Save
6. Apply the list to campaigns: select campaigns > Settings > Negative Keywords > Use Negative Keyword List

Performance Max Update (2025-2026)

As of January 2025, Performance Max campaigns now support:

• Campaign-level negative keywords (up to 10,000 per campaign)
• Shared negative keyword lists

This is a significant improvement. Previously, PMax had no negative keyword capability, contributing to its reputation for wasted spend on irrelevant queries.

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The Negative Keyword Maintenance Routine

Building the initial list is step one. Maintaining and expanding it is an ongoing discipline.

Weekly Routine (15-20 minutes)

Every week, perform this check:

1. Open Search Terms Report (Campaigns > Insights & Reports > Search Terms)
2. Sort by cost (highest first)
3. Scan for irrelevant queries — anything that is clearly not a potential customer
4. Add irrelevant queries as negatives with appropriate match type
5. Look for patterns — if you see multiple queries with "salary," add "salary" as a broad negative rather than blocking each query individually
6. Check the "Other Search Terms" row — this represents queries Google withholds. If the aggregate metrics are poor, your targeting may be too broad.

Monthly Routine (30-45 minutes)

In addition to the weekly check:

1. Run performance review by negative keyword list — are your shared lists catching the intended traffic?
2. Review keywords with zero conversions in the past 30 days — should any become negatives?
3. Check for over-blocking — has any negative keyword inadvertently blocked a relevant query? (Check impression share for clues)
4. Add seasonal negatives — holiday terms, back-to-school, event-specific terms that may trigger irrelevant matches

Quarterly Routine (1-2 hours)

1. Run full N-Gram analysis on the past 90 days of search terms
2. Audit shared lists — remove any negatives that may now be relevant (business expanded services, added new locations)
3. Benchmark conversion rates — compare periods before and after negative keyword additions
4. Industry review — check if new irrelevant search trends have emerged in your industry

The 10% Rule

Jyll Saskin Gales (former Google employee) offers this benchmark: "If you need to add 10% or more of your search terms as negatives, that is a red flag."

If your negative keyword additions consistently exceed 10% of total search terms, the problem is not just missing negatives — your underlying keyword targeting is too broad. Consider:

• Switching from broad match to phrase or exact match
• Restructuring ad groups around tighter themes
• Reducing the number of keywords per ad group

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Industry-Specific Negative Keyword Templates

Plumbing (60+ Negatives)

Jobs & Education: plumber salary, plumber school, plumber license, plumber apprentice, plumber certification, plumber union, plumber exam, become a plumber, plumbing degree, plumbing course, plumbing training

DIY & Supplies: plumbing parts, plumbing supplies, plumbing tools, plumber snake, plumber tape, pipe wrench, pipe cutter, PVC pipe, copper pipe, plumbing diagram, plumbing code, how to fix, how to install, how to unclog, DIY plumbing

Irrelevant: plumber crack, plumber meme, plumber game, plumber costume, plumber movie, Mario plumber, plumber van, plumber truck, plumber logo, plumber t-shirt, plumber jokes

Generic/Low-Intent: free plumber, cheap plumber, plumber Wikipedia, plumber definition, what is a plumber, types of plumbers, plumber vs handyman

HVAC (50+ Negatives)

Jobs & Education: HVAC salary, HVAC school, HVAC certification, HVAC technician training, HVAC apprentice, HVAC license, HVAC exam, become HVAC technician, HVAC degree, HVAC course

DIY & Supplies: HVAC parts, HVAC filter, air filter, furnace filter, thermostat installation, HVAC ductwork, refrigerant, HVAC tools, HVAC manual, HVAC diagram, how to fix AC, DIY HVAC

Irrelevant: HVAC meaning, HVAC definition, HVAC Wikipedia, what is HVAC, HVAC system types, HVAC design software, HVAC drawing, HVAC engineering

Legal Services (50+ Negatives)

Education: law school, LSAT, bar exam, legal studies, paralegal course, law degree, legal internship, law clerk, law review, legal research, case study

DIY & Free: free legal advice, legal aid, pro bono, public defender, represent yourself, self-representation, legal forms free, legal templates, legal documents free, court forms

Irrelevant: legal definition, legal meaning, law wiki, famous lawyers, lawyer jokes, lawyer memes, lawyer movies, lawyer shows, law firm rankings, Am Law 100

Dental (50+ Negatives)

Education: dental school, dental hygienist, dental assistant, dental technician, dentistry degree, dental board exam, dental residency, dental training

DIY & Products: dental products, teeth whitening kit, toothbrush, toothpaste, dental floss, mouthwash, dental wax, dental cement, home teeth whitening, DIY dental

Irrelevant: dental insurance, dental plan, dental coverage, Medicare dental, Medicaid dental, dental anatomy, dental chart, dental x-ray reading, dental jokes

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Measuring the Impact of Negative Keywords

After implementing your negative keyword strategy, track these metrics to measure success.

Before/After Comparison Table

Create this comparison 30 days after implementing your negative keyword list:

Expected Improvements by Implementation Level

Source: Aggregated from GROAS.ai, PPC Land, Store Growers

Quality Score Impact

Negative keywords improve Quality Score indirectly by:

1. Increasing CTR — Only relevant searchers see your ad, so a higher percentage click
2. Improving ad relevance — Your ad matches the actual search intent better
3. Better landing page experience — Visitors arrive with matching expectations

Quality Score improvements from negative keywords can reduce CPC by 15-25% and improve ad position by 0.8-1.3 positions (GROAS.ai).

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Advanced Strategies

Strategy 1: Negative Keyword Discovery from Competitors

Use tools like SpyFu or Semrush to see what keywords competitors bid on. If they bid on terms irrelevant to your business, add those as negatives proactively — before you accidentally match to them.

Strategy 2: Seasonal Negative Keywords

Some irrelevant queries spike during certain times:

Add these to a "Seasonal Negatives" shared list and activate/deactivate as needed.

Strategy 3: Cross-Campaign Negatives for Intent Separation

If you run multiple campaigns targeting different intent levels, use negatives to prevent overlap:

This ensures each query triggers the right campaign with the right bid and ad copy.

Strategy 4: Mining Your CRM for Negative Ideas

Look at your CRM data for leads that never converted to customers. Common reasons:

• They wanted a service you do not offer — add that service as a negative
• They were outside your service area — add that location as a negative
• They were looking for a price point below your minimum — add discount/cheap terms
• They were a student or researcher — add educational terms

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Common Mistakes to Avoid

Mistake 1: Reactive Instead of Proactive

Most advertisers add negatives only after seeing waste in their Search Terms Report. By then, the money is already spent. The Layer 1-4 approach above blocks the majority of waste before a single dollar is wasted.

Mistake 2: Adding Negatives Too Aggressively

Be careful not to block queries that seem irrelevant but actually convert. The term "cheap plumber" might seem like a low-quality searcher, but in some markets, price-sensitive customers are high-converting leads.

Rule: If a query has generated even one conversion, think twice before adding it as a negative. Check the downstream value in your CRM first.

Mistake 3: Never Reviewing the Negative List

Your business changes. You add new services, expand to new areas, change pricing models. Review your negative keyword lists quarterly to ensure you are not blocking queries that are now relevant.

Mistake 4: Using Only Exact Match Negatives

Exact match negatives block one query. Broad match negatives block patterns. If someone searches "plumber salary in Chicago" today, they will search "plumber salary in Dallas" tomorrow. A broad match negative on "salary" blocks both (and every future variation).

Mistake 5: Ignoring the "Other Search Terms" Category

At the bottom of your Search Terms Report, Google aggregates queries it does not show individually (cited as privacy reasons). This "Other Search Terms" row often represents 20-40% of your total queries and tends to have 52% higher CPC and 44% lower CTR than visible terms.

If this category shows poor performance, it is a signal that your targeting is too broad. Tighten your match types and expand your negative keyword list. For a deep dive into this hidden waste, see Search Terms Report Mastery.

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The Complete Negative Keyword Checklist

Before Launch

• Add 50-70 universal negative keywords (jobs, DIY, free, entertainment)
• Add 50-80 industry-specific negative keywords
• Add competitor brand names (unless running competitor campaigns)
• Add geographic exclusions for areas you do not serve
• Set up shared negative keyword lists and apply to all campaigns
• Use appropriate match types (broad for concepts, phrase for specific phrases)

Weekly (15-20 minutes)

• Review Search Terms Report sorted by cost
• Add new irrelevant queries as negatives
• Look for patterns (recurring words/phrases) — add at the n-gram level
• Check "Other Search Terms" row performance

Monthly (30-45 minutes)

• Review zero-conversion keywords — should any become negatives?
• Check for over-blocking (impression share drops)
• Add seasonal negatives if applicable
• Review shared list coverage across campaigns

Quarterly (1-2 hours)

• Run full N-Gram analysis on 90 days of search terms
• Audit shared lists for outdated exclusions
• Benchmark conversion rate improvement since last quarter
• Update industry-specific negatives for new search trends
• Review CRM data for patterns in non-converting leads

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Key Takeaways

The Numbers

• 25% of accounts have zero negative keywords
• 4.6% conversion rate without negatives vs 13% with negatives (3x difference)
• 23-34% of traffic is irrelevant without negative keywords
• 67% lower CPA with 200+ negative keyword strategies
• 84% of advertisers use fewer than 50 negatives
• 400-800% ROI from comprehensive negative keyword management
• $8,400-$23,700 monthly savings for medium-sized businesses

The Framework

1. Layer 1: Universal negatives (50-70 keywords) — add before launching
2. Layer 2: Industry-specific negatives (50-80 keywords) — add before launching
3. Layer 3: Competitor and brand exclusions (10-20 keywords)
4. Layer 4: Geographic exclusions (10-20 keywords)
5. Layer 5: Data-driven additions (ongoing from Search Terms Report)

The Rules

1. Proactive beats reactive. Build your list before spending, not after.
2. Use shared lists. Apply universally, maintain centrally.
3. Match types matter. Broad for concepts, phrase for specific phrases, exact for surgical precision.
4. Maintain weekly. 15-20 minutes per week prevents thousands in waste.
5. Never over-block. Check for conversion data before excluding any query that might be relevant.

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Next Steps

1. Build your initial 200+ negative keyword list using the templates above
2. Create shared negative keyword lists in your Google Ads account
3. Apply lists to all campaigns (including Performance Max)
4. Set a weekly calendar reminder for Search Terms Report review
5. Run your first N-Gram analysis after 30 days of data

For the foundation on why intent-based targeting matters, read Demand Capture vs Demand Generation. For the weekly audit process that feeds your negative keyword list, see Search Terms Report Mastery. For a complete checklist of Google Ads settings that waste money, see Google Ads Default Settings That Waste Money.

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This article is part of the Google Ads Efficiency Playbook 2026 series. Data sourced from PPC Land (15,000 accounts), GROAS.ai, WordStream, Store Growers, Search Engine Land, and industry benchmarks.