Negative Keyword
A negative keyword tells Google Ads not to show your ad when a search query contains a specific word or phrase, preventing irrelevant, wasted clicks.
Written by Sam Flynn
TL;DR
Negative keywords exclude irrelevant searches from triggering your ads, reducing wasted spend and improving Quality Score. Adding negative keywords is consistently one of the highest-ROI optimizations in Google Ads, most accounts waste 20–40% of budget on irrelevant traffic before negative keywords are properly set up.
What Is a Negative Keyword?
A negative keyword is a word or phrase that, when present in a search query, prevents your ad from showing. If you sell premium software, adding "free" as a negative keyword stops your ad from appearing for "free software" searches, users looking for free tools won't convert on your paid product.
Negative Keyword Match Types
| Type | How It Works | Example |
|---|---|---|
| Negative broad | Excludes queries containing any word | -free → blocks "free CRM", "CRM free trial" |
| Negative phrase | Excludes queries containing the exact phrase | -"free trial" → blocks "free trial CRM" |
| Negative exact | Excludes only the exact query | -[free CRM] → only blocks "free CRM" |
Negative Keyword Sources
| Source | How to Find |
|---|---|
| Search term report | Review actual queries triggering your ads |
| Keyword research | Anticipate irrelevant intent variations |
| Industry knowledge | "jobs," "salary," "DIY" for B2B products |
| Competitor list | Prevent triggering on competitor brand queries |
Common Negative Keyword Categories
| Category | Example Terms |
|---|---|
| Intent mismatch | free, cheap, DIY, tutorial, how to |
| Wrong audience | student, beginner, entry-level |
| Competitor names | [competitor brand] |
| Irrelevant industry | If you sell B2B: "personal," "consumer" |
| Non-purchase intent | "review," "vs," "alternative" (sometimes, depends on strategy) |
Benchmarks
| Metric | Impact of Negative Keywords |
|---|---|
| Budget waste reduction | 20–40% for uncoptimized accounts |
| Quality Score improvement | Fewer irrelevant impressions = higher CTR = higher QS |
| Time to audit | Weekly review of search term report |
Best Practices
| Practice | Why |
|---|---|
| Review search term report weekly | New irrelevant queries appear constantly |
| Add at campaign and ad group level | Campaign negatives apply broadly; ad group for nuance |
| Build a shared negative keyword list | Apply across multiple campaigns efficiently |
| Add negatives before launching | Prevent obvious waste from day one |
Common Mistakes
- Skipping search term report review: without it, you don't know what you're paying for
- Only setting up negatives at launch: new irrelevant queries emerge over time
- Being too aggressive: accidentally blocking converting queries
- No shared negative lists: manually applying the same negatives to 20 campaigns wastes management time
Key Takeaways
- Negative keywords prevent ads from showing for irrelevant searches, cutting wasted spend
- Most unoptimized accounts waste 20–40% of budget without a robust negative keyword strategy
- Weekly search term report review is the primary mechanism for finding new negatives
- Shared negative keyword lists make it efficient to apply exclusions across multiple campaigns
