A keyword can look right in a campaign plan and still trigger searches that are completely wrong for the business.
A roofing company advertising repairs might appear alongside searches for roofing jobs, DIY materials or training. A professional service might receive enquiries from people outside its operating area. Some of those clicks are unavoidable during testing, but others can be filtered out.
Negative keywords help control what a campaign should not show for. The difficult part isn’t making a huge exclusion list. It’s excluding the wrong intent without hiding from the right customer.
Understand what a negative keyword does
A negative keyword tells Google Ads not to show an ad when a search matches the exclusion according to the relevant negative match rules.
These rules aren’t identical to the positive keyword system, and they can behave differently across campaign types. Before applying a long list, review the platform’s current documentation.
The key question is simple: Is this search something our business genuinely wants?
Start with services you do not provide
Make a clear list of excluded work, audiences and transaction types.
A residential repair company might not serve wholesale buyers. A company that installs finished products may not sell parts individually. A local provider may not offer internships or training.
Potential exclusions include words about employment, DIY advice or free materials, but they are not universal. Someone searching for a “free estimate” could be an excellent lead if the company really offers one.
Avoid copying a generic negative-keyword list into every account. Business context comes first.
Use the search terms report as your evidence
The search terms report shows searches that triggered ads, subject to reporting thresholds and platform rules.
Review the queries and sort them into three groups: clearly relevant, clearly irrelevant and uncertain.
Add exclusions for genuinely irrelevant themes. Keep uncertain queries under observation or investigate what the person likely wanted. One search phrase may be ambiguous without knowing the service being advertised.
Note the reason for each exclusion. A simple shared log avoids confusion when someone revisits the account months later.
Choose match types with care
Negative broad, phrase and exact match can exclude different sets of searches. A broad exclusion may remove more traffic than intended; an exact exclusion may be too narrow to handle a whole irrelevant theme.
Check variations before making changes. For example, excluding “repair” might stop useful searches if your business installs and repairs equipment. Excluding “training” may make sense if you never teach classes, but check whether it appears in a legitimate service context.
Google’s negative keyword guidance is worth reviewing as settings and behaviour evolve.
Look beyond keywords when leads are poor
Sometimes the search term is appropriate but the enquiry still isn’t a fit.
The landing page may not clearly explain the location served, job size, minimum scope or whether the service is residential or commercial. Fix that information rather than excluding every search that produces an awkward lead.
Sometimes the targeting is too broad geographically. Sometimes conversion tracking is counting form attempts or phone clicks as verified enquiries.
See Google Ads for local services for planning the complete campaign, and conversion tracking for measuring outcomes reliably.
Build a manageable review rhythm
Early in a new campaign, check search terms more frequently as the system reveals where ads are appearing. Once the campaign is stable, use a review schedule appropriate to its spend and volume.
Record what you excluded, when and why. Look for changes in qualified enquiries, not just a lower spend figure. A campaign that costs less because you’ve blocked half the useful traffic hasn’t improved.
If the business launches a new service, revisit exclusions. Words that were inappropriate last quarter may now describe genuine demand.
A practical example
Imagine a local fence installer that builds and repairs residential fences but doesn’t sell wholesale timber or hire apprentices.
Employment and materials-only searches may deserve exclusion. Searches for “fence repair estimate” may be relevant. “How to repair fence panels” is more ambiguous: some people want instructions, but others may still be considering a professional.
Inspect the actual query, the account’s goals and any conversion evidence before deciding. Exclusions should reflect the business’s market, not assumptions about how all customers search.
Categories are one part of a wider local visibility plan, alongside accurate business information and useful pages.
Frequently asked questions
Should I add hundreds of negative keywords before launch?
Not automatically. Start with obvious exclusions and review actual search terms. Large borrowed lists can block valuable demand.
Will negative keywords improve my Google Ads results?
They can reduce irrelevant impressions and clicks, but they cannot fix a weak offer, incorrect targeting or poor lead handling.
Are negative keywords the same as positive keywords with a minus sign?
They’re a separate targeting control with their own match rules. Review the platform settings rather than assuming equivalent behaviour.
Should I exclude “free”?
Only when it genuinely conflicts with your offer. Businesses advertising free estimates may need searches containing that word.
A disciplined exclusion process protects budget while leaving room for genuine customers to find you.