How To Use Negative Keywords To Stop Wasting Ad Spend

Negative keywords are the single most underused optimization in Google Ads. They prevent your ads from showing on irrelevant searches, instantly cutting wasted spend. Most advertisers who implement comprehensive negative keyword lists see 20–40% budget savings without losing qualified traffic. This guide shows you exactly how.

What Are Negative Keywords?

A negative keyword tells Google: “Don't show my ad when someone searches for this term.” For example, if you sell premium roofing services, you'd add “free,” “cheap,” “DIY,” and “jobs” as negatives — because people searching those terms aren't going to hire you.

Step 1: Review Your Search Terms Report

Go to Google Ads → Insights → Search Terms. This shows you the actual queries people typed that triggered your ads. Sort by clicks and look for terms with:

• High clicks but zero conversions
• Irrelevant intent (job seekers, DIYers, free seekers)
• Out-of-area locations
• Wrong product or service type

Step 2: Build Negative Keyword Categories

Create negative keyword lists by category:

Job Seekers

Block: jobs, hiring, careers, employment, salary, apply, resume, indeed, internship

DIYers & Informational

Block: how to, diy, tutorial, guide, free, definition, what is, learn, examples

Price Shoppers

Block: cheap, cheapest, free, discount, coupon, wholesale, used, refurbished

Out-of-Area

Block: Cities, states, and ZIP codes you don't serve. Use geographic negatives to prevent clicks from outside your service area.

Step 3: Choose the Right Match Type

Negative keywords have match types just like regular keywords:

• Negative Broad: Blocks searches containing all your negative words in any order
• Negative Phrase: Blocks searches containing the exact phrase in that order
• Negative Exact: Blocks only the exact search term with no additional words

Start with Negative Phrase for most terms — it's specific enough to block the right searches without being too narrow.

Step 4: Use Negative Keyword Lists

Instead of adding negatives to each campaign individually, create shared negative keyword lists in Tools → Negative Keyword Lists. Apply the same list to multiple campaigns. This keeps your negatives organized and consistent.

Step 5: Review Weekly & Refine

Set a weekly calendar reminder to review your search terms report. Each week you'll find new irrelevant terms to block. Over time, your negative keyword lists become a powerful budget protection system.

Step 6: Measure the Impact

Track your savings by comparing:

• Cost per conversion before and after adding negatives
• Conversion rate improvement
• Total wasted spend eliminated
• Click-through rate changes (should improve as irrelevant impressions drop)

Negative keywords are the easiest win in Google Ads. A well-maintained negative keyword list can save thousands per month and dramatically improve your cost per qualified lead. If you'd like help building and managing your negative keyword lists, we handle it as part of our full ad management service.