Google Ads negative keywords for B2B SaaS: the list that protects your budget

Negative keywords are the single most underused budget-protection tool in Google Ads. They tell Google: never show my ad for any search containing these terms. For B2B SaaS, a well-built negative keyword list blocks four categories of non-buyer traffic that consistently appear in B2B search campaigns: job seekers, free-tool hunters, students and learners, and informational researchers. Most solo founders add a handful of obvious negative keywords at setup and never revisit the list. The right approach is to start with a comprehensive list on day one.

Job and employment negative keywords

Add these as broad match negative keywords to block all employment-related variations: jobs, job, hiring, career, careers, salary, salaries, "how much does," "how to become," "what does a [role] do," resume, CV, interview, internship, apprenticeship, employment, recruit, recruiter, recruitement, "work at," "work for," glassdoor, indeed, linkedin jobs. These block anyone using your ad-triggering keywords in an employment research context.

Free-tool and budget negative keywords

Add these to prevent clicks from users whose intent is a free solution: free, freemium, "open source," "no cost," cheap, affordable, "low cost," "best free," "free trial" (unless you offer one), "free alternative to," "free [your category]," crack, pirate, torrent. These users are disqualified at the price conversation — they're not buyers at your price point.

Student and educational negative keywords

Add these to block educational intent traffic: course, courses, tutorial, tutorials, training, certification, "how to learn," "learn [topic]," udemy, coursera, "what is," beginner, basics, introduction, "getting started with," guide (use carefully — "buying guide" is fine, "beginner guide" is not), textbook, homework, assignment. The challenge here is that "what is [your category]" queries are not buyers — they're curious. Exclude them unless you're running top-of-funnel content ads.

Competitor and wrong-category negative keywords

Review your Search Terms report monthly and add: competitor terms you're not bidding on intentionally (to avoid accidental competitor traffic), wrong-category terms ("CRM for nonprofits" if you don't serve nonprofits, "personal CRM" if you're B2B only), and geographic qualifiers for markets you don't serve. Also add the names of your own company and product as negative keywords in non-branded campaigns to keep branded and non-branded traffic separate.

How do you maintain a negative keyword list over time?

Set a monthly calendar reminder: 30 minutes in the Search Terms report, add new negative keywords for any non-converting query patterns you see. In the first 3 months of a new campaign, do this weekly — the initial period surfaces the most surprising irrelevant traffic. After 3 months, monthly is sufficient. A well-maintained negative keyword list compounds over time: each addition reduces wasted spend and improves the average quality of traffic that remains.