Negative Keywords: How to Exclude Irrelevant Searches in Google Ads

Negative keywords are terms added to Google Ads campaigns to prevent ads from appearing when those terms are included in a search query. They are the opposite of target keywords — where target keywords tell Google when to show your ad, negative keywords tell Google when not to show it. Used correctly, they are one of the most impactful optimization techniques for reducing wasted ad spend and improving campaign efficiency.

The problem negative keywords solve: broad and phrase match keyword targeting in Google Ads captures a wide range of search queries that may include irrelevant terms. A plumber advertising for "drain repair" might also trigger for "DIY drain repair," "drain repair tools," or "drain repair tutorials" — all searches from non-buyers. Each irrelevant impression and click wastes budget that could be allocated to searches with genuine buying intent.

⠀

How Negative Keywords Work

⠀

Negative keywords follow the same match type logic as regular keywords:

Negative broad match: The ad won't show if all words in the negative keyword appear anywhere in the query, in any order. Adding "free" as a negative broad match prevents showing for any query containing the word "free."

Negative phrase match: The ad won't show if the exact phrase appears in the query in order. -"free download" prevents showing for "free download software" but still allows "download free software."

Negative exact match: The ad won't show only for the exact query, with no additional words. [-free download] prevents showing only for the exact search "free download."

Where to apply negative keywords:

• Account level (Negative Keyword Lists): Apply across all campaigns. Useful for terms that are always irrelevant to your business.
• Campaign level: Apply to all ad groups within a campaign. Useful for terms irrelevant to a specific product or service but potentially relevant to others.
• Ad group level: Apply to a single ad group. Useful for preventing overlap between ad groups targeting related but distinct keywords.

⠀

⠀

Building a Negative Keyword List

⠀

Step 1: Identify your irrelevant categories

Before campaigns launch, brainstorm categories of searches that would definitely not convert for your business:

• Price-sensitive research: "free," "cheap," "DIY," "how to do yourself"
• Competitor brand names (if you don't run competitor campaigns intentionally)
• Wrong industry terms: If you sell B2B software, "student," "school," "homework" may be irrelevant
• Employment searches: "jobs," "careers," "salary," "vacancy," "hiring"
• Information-only intent: "what is," "history of," "definition," "wikipedia" (unless you're targeting informational intent specifically)

⠀

Step 2: Analyze the Search Terms Report

The Search Terms Report in Google Ads (accessible via Reports or the Keywords tab → Search Terms view) shows the actual queries that triggered your ads. Review this report weekly — it reveals specific irrelevant terms your campaigns are showing for that you didn't anticipate.

Step 3: Add negatives from Search Terms regularly

The Search Terms Report is the most reliable source of negative negative keywords because it shows what's actually triggering your ads in your specific market. Filter by high impressions with zero conversions, or by terms that are clearly irrelevant to your offer, and add those to your negative list.

⠀

Common Negative Keyword Categories

⠀

⠀

⠀

Research and DIY intent:

free, DIY, yourself, tutorial, how to, guide, instructions, manual, learn, course, training, template, example, sample

Employment-related:

jobs, job, careers, career, hiring, salary, wages, employment, work, internship, apprenticeship, vacancy

Academic and informational:

essay, assignment, homework, school, university, college, student, research paper, thesis, definition, wikipedia, history

Wrong products or services:

If you provide commercial plumbing services, add: residential, home, house, apartment

If you sell premium products, add: cheap, budget, affordable, low-cost, discount, free

Wrong geography (for location-based businesses):

Add cities, states, and regions outside your service area as negative keywords to prevent showing to geographically irrelevant searchers.

Competitor campaigns (if not targeting competitors intentionally):

Add specific competitor brand names as negatives to avoid paying for clicks from brand-loyal customers who won't convert to your offer.

⠀

Negative Keywords for SEO Keyword Research

⠀

Beyond Google Ads, negative keywords inform SEO strategy. Keywords that consistently produce high-volume, non-converting traffic in paid campaigns are worth noting in organic strategy — if "free SEO tools" drives traffic but never converts, informational content for that query may not be a priority for conversion-focused SEO.

The reverse also applies: queries excluded from paid campaigns because they're informational (free, how to, guide) are often excellent organic content targets. Users searching with informational intent may not be ready to buy but are ideal early-funnel SEO audience members.

⠀

Measuring Negative Keyword Impact

⠀

⠀

⠀

The measurable impact of a well-developed negative keyword list:

Reduced wasted spend: Impressions and clicks on irrelevant terms disappear, reducing cost-per-conversion by directing budget to qualifying searches.

Improved CTR: Showing ads to a more relevant audience increases click-through rate — a signal that improves Quality Score.

Higher Quality Score: Improved CTR and better ad relevance (fewer irrelevant impressions) raise Quality Score, which reduces cost-per-click across the campaign.

Lower cost per conversion: Fewer clicks from non-buyers reduces the total click volume needed for each conversion, directly lowering cost per lead or sale.

Track these metrics before and after adding significant negative keyword lists. The improvement is typically visible within 2–4 weeks of consistent Search Terms Report review and exclusion.

Blakfy builds comprehensive negative keyword lists for client Google Ads campaigns — reviewing search terms data, identifying systematic exclusion patterns, and applying negatives at the appropriate campaign and account levels to reduce wasted spend and improve campaign efficiency.

⠀

⠀

Frequently Asked Questions

⠀

How many negative keywords should I have?

There's no upper limit — the more thoroughly you exclude irrelevant searches, the more efficiently your budget is spent. A typical campaign might have 50–200 negative keywords at launch and grow to 500+ after months of Search Terms Report review. The key is that every negative keyword should be clearly irrelevant to your business, not just a guess at what might not convert.

Can negative keywords accidentally block valuable searches?

Yes — this is the primary risk of aggressive negative keyword use. Broad match negatives can unintentionally block related valuable queries. Always review what searches a negative keyword would block before adding it. Phrase and exact match negatives are safer than broad match because they have more limited blocking scope. If traffic or conversion volume drops unexpectedly, review recently added negative keywords for inadvertent over-blocking.

Should I share negative keyword lists across campaigns?

Account-level Negative Keyword Lists (applied across multiple campaigns) are useful for universally irrelevant terms (employment, education, "free"). Campaign-specific negatives should stay at the campaign level because some terms irrelevant to one campaign may be relevant to another. For example, "cheap" might be a negative for a premium service campaign but acceptable for a budget-service campaign.

How often should I review the Search Terms Report?

Weekly for active campaigns with significant spend. Monthly for lower-spend campaigns. The Search Terms Report is the most actionable data source for ongoing campaign optimization — new irrelevant queries emerge regularly as Google's matching algorithms evolve. Consistent review prevents gradual budget drift toward irrelevant searches over time.