Google Ads Negative Keywords: The Complete Guide
Negative keywords are one of the most powerful — and most underused — tools in Google Ads. They prevent your ads from showing for irrelevant searches, protecting your budget and improving campaign performance. Yet most accounts we audit at Spires Digital have either no negative keyword strategy at all, or a list that has not been updated in months. This guide covers everything you need to know about negative keywords, from match types and lists to common mistakes that silently drain budget.
What Are Negative Keywords?
Negative keywords tell Google Ads which search terms you do not want your ads to appear for. If you sell premium accounting software and someone searches "free accounting software," showing your ad wastes a click. Adding "free" as a negative keyword prevents that.
The impact is significant. Across our client portfolio, properly maintained negative keyword lists typically reduce wasted spend by 15-25% in the first month alone.
Negative Keyword Match Types
Like regular keywords, negative keywords have match types — but they work differently from standard match types. Understanding these differences is critical.
Negative Broad Match
Your ad will not show if the search contains all the negative keyword terms, in any order. The search can include additional words and still be blocked. This is the default match type for negatives.
- Negative keyword: free trial
- Blocked: "free accounting trial," "trial software free"
- Not blocked: "free accounting software" (missing "trial")
Negative Phrase Match
Your ad will not show if the search contains the exact negative keyword phrase in order. Additional words before or after the phrase are still blocked.
- Negative keyword: "free trial"
- Blocked: "free trial accounting software," "best free trial"
- Not blocked: "free accounting trial" (words not in order)
Negative Exact Match
Your ad will not show only if the search is exactly the negative keyword, with no additional words.
- Negative keyword: [free trial]
- Blocked: "free trial" only
- Not blocked: "free trial software," "best free trial"
Building Your Initial Negative Keyword List
Do not wait for wasted spend to tell you what to exclude. Build a proactive negative keyword list before launching any campaign.
Universal Negatives
These terms are almost always irrelevant for commercial campaigns:
- Job-related: jobs, careers, salary, hiring, internship, recruitment
- Education-related: course, training, certification, university, degree, tutorial
- Free-seekers: free, cheap, discount, coupon, deal (unless you offer these)
- DIY/Self-service: DIY, how to, template, example, sample
- Competitor brands: Names of competitors you do not want to bid on
Industry-Specific Negatives
Think about terms that are relevant to your industry but not to your specific offering. A B2B software company might negative "personal," "home," "student," and "hobby" versions of their product keywords.
For more on structuring your account to support negative keyword strategies, see our guide to Google Ads campaign structure.
Search Term Analysis: Your Ongoing Gold Mine
The search terms report in Google Ads shows exactly what people searched before clicking your ad. Reviewing this report regularly is the single most important maintenance task for any Google Ads account.
How to Conduct a Search Term Audit
- Review search terms at least weekly for new campaigns, fortnightly for established ones
- Sort by cost or impressions to find the biggest sources of waste first
- Look for patterns — if you see multiple variations of an irrelevant theme, add the root term as a negative
- Check search terms across all campaigns, not just your highest-spend ones
What to Look For
- Irrelevant queries: Searches with no commercial intent for your business
- Low-quality queries: Searches that get clicks but never convert
- Cannibalisation: Searches that should be handled by a different campaign
- Brand confusion: Searches for similarly-named competitors or products
Shared Negative Keyword Lists
Shared negative keyword lists apply to multiple campaigns at once, saving you from maintaining duplicates. They are managed at the account level under Tools and Settings, then Shared Library.
Recommended Shared List Structure
- Universal negatives: Terms that should be excluded from every campaign (jobs, free, etc.)
- Brand negatives: Competitor names excluded from non-competitor campaigns
- Product negatives: Product lines excluded from campaigns targeting different products
- Geographic negatives: Location terms for areas you do not serve
Apply your universal negatives list to every campaign as soon as it is created. This prevents the inevitable waste that comes from new campaigns running without protection.
Common Negative Keyword Mistakes
Using Too Many Exact Match Negatives
Adding every irrelevant search term as an exact match negative is a never-ending game. Instead, identify the root theme and add it as a broad or phrase match negative. One well-chosen phrase match negative can block dozens of irrelevant queries.
Not Reviewing the Hidden Terms
Google now hides a significant percentage of search terms for privacy reasons. While you cannot see every query, the terms that are shown represent the most common ones. Use them to identify patterns and extrapolate negatives for terms you cannot see.
Accidentally Blocking Relevant Traffic
Be careful with broad match negatives. Adding "management" as a negative might block "PPC management services" alongside "anger management." Always check whether a potential negative could conflict with your target keywords.
Set-and-Forget Lists
Your negative keyword list should be a living document. Search behaviour changes, new competitors appear, and your own product offerings evolve. Schedule monthly reviews at minimum.
Negative Keywords and Smart Bidding
Smart Bidding strategies like Target CPA and Target ROAS rely on conversion data to optimise bids. Irrelevant clicks that never convert introduce noise into the algorithm, potentially degrading bidding performance across your entire campaign. A strong negative keyword strategy keeps your conversion data clean and helps Smart Bidding work more effectively.
Frequently Asked Questions
How many negative keywords should I have?
There is no magic number. A well-managed account might have 100-500 negatives across shared lists and individual campaigns. Focus on quality over quantity — a few well-chosen phrase match negatives can be more effective than hundreds of exact match ones. The goal is to block irrelevant traffic without accidentally restricting relevant searches.
Do negative keywords affect Quality Score?
Indirectly, yes. By preventing your ads from showing for irrelevant searches, negative keywords improve your click-through rate (CTR) among relevant queries. Since expected CTR is a component of Quality Score, a cleaner query profile can positively influence your scores over time.
Can I use negative keywords with Performance Max campaigns?
Yes, Google now allows account-level negative keywords that apply to Performance Max campaigns. You can also request campaign-level negatives through your Google Ads representative. This was a major limitation that has been addressed in 2025-2026 updates.
Should I negative my own brand terms in non-brand campaigns?
Generally, yes. Adding your brand name as a negative keyword in non-brand campaigns prevents them from capturing branded searches, which should be handled by a dedicated brand campaign with its own budget and bidding strategy. This gives you cleaner data and better control over budget allocation.
A disciplined negative keyword strategy is one of the fastest ways to improve Google Ads performance. If you want help auditing your search terms and building a comprehensive negative keyword framework, get in touch with Spires Digital or book a free strategy call via Calendly. See our full PPC management services for more details on how we help clients cut waste and grow profitably.