Negative keywords are exclusion terms that stop your Google Ads from showing on queries you don't want to pay for — at ad-group, campaign, or list level.
What negative keywords do
Negative keywords sit on the exclusion side of the auction: when a query matches an active negative, your ad is suppressed regardless of bid, Quality Score, or budget. Three scopes exist: ad-group negatives (narrow theme-overlap exclusions), campaign negatives (account-wide per product line), and shared negative keyword lists — capped at 5,000 keywords per list with up to 20 lists per account.
You manage them under Tools → Shared library → Exclusions, or per campaign under Keywords → Negative keywords. The point is not just blocking junk queries — it is concentrating budget on commercial-intent traffic, which lifts CTR on what remains, which lifts Quality Score, which lowers CPC for the same Ad Rank.
How match types work for negatives
Negatives accept the same three match types as positive keywords — broad, phrase, exact — but the matching logic is stricter: no close-variant expansion, no semantic broadening.
| Match type | Triggers exclusion when... | Does NOT exclude |
|---|---|---|
Negative broad (free shoes) |
Query contains all terms in any order | free shoe, complimentary footwear |
Negative phrase ("free shoes") |
Query contains the phrase in order | shoes free (order differs) |
Negative exact ([free shoes]) |
Query is exactly free shoes |
free shoes online |
"Negative keywords don't include close variants. 'Running shoe' and 'running shoes' are treated as completely different terms."
— Google Ads Help, "About negative keywords"
Single softening since June 2024: misspellings are auto-blocked. Adding youtube as a negative also catches youtub, youtbe, you tube without manual enumeration (Google Ads Help, 2024-06-26). Plural/singular pairs and synonyms still need separate entries.
PMax negatives in 2025
Until 2025 PMax negatives required a support-ticket request, capped at 100 per campaign. On 2025-01-23 Google launched a self-serve UI for campaign-level negatives in Performance Max with the same 100-keyword limit; on 2025-03-11 Ginny Marvin announced the cap was raised to 10,000 per campaign (PPC Land, 2025-03-11). PMax negatives apply only to Search and Shopping inventory — they do not filter Display, YouTube, Discover, or Gmail placements.
PMax also exposes brand exclusions (account-level brand list to stop PMax cannibalising branded Search) and account-level negative keyword lists (since 2024-Q3) usable across PMax + Search. Use brand exclusions to stop PMax cannibalising branded queries; use campaign negatives for irrelevant categories, competitors, and free-intent modifiers.
Common misconceptions
Should I dump 500+ negatives on day one to "protect" the campaign?
No. Hundreds of speculative negatives at launch over-constrain the learning phase — Smart Bidding cannot find profitable patterns it has never seen serve. Optmyzr's pattern: start with 20-50 obvious negatives (free, cheap, jobs, DIY, competitor names), then drive the rest from the search terms report after 100-200 conversions (Optmyzr, 2024).
Do negatives help low Search CTR?
Yes — usually more than rewriting ad copy. Most low-CTR Search is match-type bleed pulling irrelevant queries. A 30-day search-terms audit plus 30-50 negatives typically lifts CTR 15-40% within two weeks because impressions on garbage queries shrink faster than clicks.
Will negatives block my own positive keyword if they overlap?
Yes, and silently. Bid on [running shoes] exact and add shoes as a campaign-level negative broad — the negative wins. Run the conflict checker (Tools → Bulk actions → Negative keyword conflicts) after bulk uploads.
Methodology note — how Whitead diagnoses negative-keyword hygiene. When a Whitead audit flags weak negatives, we are not measuring "average QS uplift" against a benchmark — we are reading three signals in sequence on the account itself. (1) Negatives footprint: count of active campaign negatives + presence of at least one shared list; an account with a thin footprint and no shared list is treated as un-pruned by default. (2) Search-terms entropy: export the last 90 days of search terms and bucket by conversion rate quartile; if the bottom quartile of queries consumes a disproportionate share of impressions on commercial head terms, the expected-CTR component of Quality Score is structurally suppressed, and adding negatives is the highest-leverage fix before touching ad copy or landing pages. (3) Post-pass re-measurement: after the negatives pass we re-pull QS and CPC on the surviving query mix at 21 and 60 days, attributing movement to the pass only if no concurrent bid-strategy or creative change occurred. We do not publish a fixed % uplift range because the magnitude depends on baseline query-mix entropy — accounts with already-tight negatives see negligible movement, accounts with severe match-type bleed see disproportionate gains. The diagnostic claim is directional, not numeric: most "Quality Score problems" are query-mix problems.
Related concepts
- Quality Score — negatives improve the expected-CTR component by removing low-intent impressions.
- Performance Max — brand exclusions + PMax campaign negatives stop PMax from stealing branded Search traffic.
- Smart Bidding — speculative day-one negatives over-constrain the learning phase, so order matters.
Sources
- Google Ads Help — About negative keywords (updated 2025)
- Google Ads Help — Negative keywords in Performance Max campaigns
- PPC Land — Google raises negative keywords limit to 10,000 for Performance Max (2025-03-11)
- Search Engine Land — What Google's query matching update means for future PPC campaigns (2024)
- Karooya — Blocking misspelled searches just got easier (2024-06-26)
- Optmyzr — Negative keywords studies (2024)