Negative keywords are terms you tell Google Ads NOT to show your ads for, even when a search query contains your bidded keywords. They are one of the most important and most under-used controls in any Google Ads account. A well-managed negative keyword list can reduce wasted ad spend by 20-50% in many accounts, depending on how loose the keyword targeting was to begin with. This post covers what negative keywords are, why they matter, how to find the right ones, and the practical management cadence.
How negative keywords work
When you add a keyword to a campaign, you’re telling Google “show my ad when someone searches for this.” But Google’s broad match (and even phrase match) can match much wider than the bidded keyword.
Example: you bid on the keyword “plumber” in broad match. Without negatives, Google may show your ad for queries like “plumber jokes,” “plumber Mario,” “DIY plumber kit,” “plumber salary,” “plumber school online” — none of which represent actual customers wanting to hire a plumber.
Each irrelevant impression that gets clicked costs you money. Each impression that doesn’t get clicked still drags down your CTR, which lowers Quality Score, which raises future costs. Negative keywords stop both problems at the source by preventing the impression from happening.
Negative keyword match types
Negative keywords use match types similar to positive keywords, but with stricter behavior:
- Negative broad match (just the term, no special syntax). Excludes searches that contain all the words in the negative keyword, in any order. “free plumber school” as broad negative excludes searches containing all three words.
- Negative phrase match (quotation marks). Excludes searches that contain the exact phrase. “free” as phrase negative excludes any search containing “free.”
- Negative exact match (square brackets). Excludes only the exact search query. [plumber] as exact negative excludes only the single-word search “plumber” but allows “plumber Valdosta,” “emergency plumber,” etc.
Most negative keyword work uses phrase or broad match. Exact match is rare in negative use because it is too narrow to filter meaningful junk.
The two main sources of negative keywords
1. The Search Terms report
The Search Terms report in Google Ads shows the actual user queries that triggered your ads. Reviewing this report regularly is the single highest-leverage negative-keyword work.
The process: filter the Search Terms report for queries with at least 5 impressions, sort by spend descending. For each query, decide: is this a real potential customer? If yes, consider adding the query as a positive keyword. If no, add the problematic words or phrase as a negative.
2. Pre-launch negative keyword lists
Before a campaign goes live, build a list of obvious negatives based on industry knowledge. For most commercial campaigns, this includes:
- “free” — most paid services don’t want to show for free-seekers
- “jobs,” “career,” “salary,” “hiring” — unless you’re a recruiter
- “DIY,” “how to,” “tutorial,” “guide” — for service businesses, these are non-buyer queries
- “used,” “cheap,” “discount” — for businesses positioning premium service
- “reviews,” “complaints,” “lawsuit” — these queries are usually research, not purchase intent
- “meme,” “joke,” “funny,” “wallpaper” — entertainment queries
- Competitor brand names — usually filtered, unless deliberately targeting competitor terms
- Geographic terms outside your service area — every city or state you don’t serve
Negative keyword lists vs ad group negatives vs campaign negatives
Google Ads lets you apply negative keywords at three levels:
- Account-level negative keyword lists. Apply across multiple campaigns. Best for negatives that apply broadly (e.g. “jobs,” “free,” “salary”).
- Campaign-level negatives. Apply across all ad groups in a campaign. Best for campaign-specific exclusions.
- Ad group-level negatives. Apply to just one ad group. Used when you want to exclude a term from one ad group but allow it in another (e.g. excluding “residential” from the commercial ad group while allowing it in the residential ad group).
For most accounts, the bulk of negatives sit in account-level lists. Campaign and ad group negatives are used for specific cases.
The recommended review cadence
- Week 1 of any new campaign. Daily Search Terms review. New campaigns produce the highest volume of unexpected query matches; cleaning them up early prevents weeks of wasted spend.
- Month 1. Weekly Search Terms review.
- Steady state. Monthly Search Terms review. Quarterly negative list audit (review the existing lists, prune anything that has become obsolete, add new categories of negatives as the account matures).
Common mistakes
- Over-negativing. Adding too many overlapping negatives can accidentally block real customer searches. Audit negative lists periodically to remove ones that have stopped serving.
- Wrong match type. Adding “free” as exact match negative does almost nothing; it only blocks the single-word search “free.” Phrase match is usually correct for these filters.
- Forgetting the Search Terms report. Many accounts never get the Search Terms review they need. Make it a recurring calendar event.
- Ignoring industry-specific edge cases. Each industry has its own list of confusing or irrelevant queries that need filtering. A plumber, a lawyer, and a roofer all need different negative lists.
- Negativing competitor brand names without strategy. Sometimes bidding on competitor brand terms is the correct strategy; sometimes it’s not. The decision depends on the competitive dynamics, not a blanket rule.
- Negative keywords in shared lists not getting reviewed. Negative lists shared across campaigns can become stale. Re-evaluate at least quarterly.
How much waste a good negative keyword program prevents
Realistic ranges for what a well-managed negative keyword program saves, depending on the starting state:
- Account with no negatives, broad match keywords. 30-60% of spend is typically going to irrelevant queries. The first round of negatives often reclaims 25-40% of that.
- Account with basic negatives, mixed match types. 15-30% of spend is going to irrelevant queries. Focused work can reclaim 10-20% of that.
- Account with strong existing negatives, mostly exact and phrase positives. Under 15% of spend is going to irrelevant queries. Maintenance work prevents drift but produces smaller percentage savings.
The savings compound. Money not wasted on irrelevant clicks can be redirected to bidding higher on real keywords, expanding into new keywords, or improving landing pages — all of which produce more leads from the same total budget.
Negative keywords in PMax and broad match campaigns
Performance Max and broad match campaigns are designed to expand reach beyond your specific keywords. They can be efficient, but they’re also more prone to matching irrelevant queries. Negative keyword discipline is especially important in these campaign types. PMax in particular has a separate negative-keyword interface (set at the campaign or account level) that needs deliberate management.