Negative keywords are words and phrases you add to a pay-per-click (PPC) campaign to prevent your ads from showing when those terms appear in a user’s search query. While standard keywords tell Google when to show your ad, negative keywords tell Google when not to. They’re the filter that keeps your ad budget from being wasted on irrelevant clicks.

If you run a law firm that handles personal injury cases and you’re bidding on “personal injury attorney,” your ads might also appear for searches like “personal injury attorney salary,” “personal injury attorney school,” or “become a personal injury attorney.” Those searches aren’t from potential clients — they’re from job seekers or students. Adding “salary,” “school,” and “become” as negative keywords blocks those irrelevant impressions and clicks, concentrating your spend on the queries that actually matter.

Types of Negative Keywords

Like standard PPC keywords, negative keywords have match types that determine how strictly they’re applied:

  • Broad match negative — The broadest filter. Blocks any search containing all of the words in your negative keyword, in any order. Adding “free” as a broad match negative blocks searches containing the word “free” alongside your keywords.
  • Phrase match negative — Blocks searches that contain your negative phrase in the exact order you specify. Adding “free consultation” as a phrase match negative blocks any query containing that exact phrase.
  • Exact match negative — The most precise. Blocks only searches that exactly match your negative keyword with no additional words. Adding [personal injury attorney salary] as an exact negative blocks that specific query but not “personal injury attorney salary options.”

Negative keywords can be applied at the campaign level (blocking terms across all ad groups) or the ad group level (blocking terms for a specific subset of ads). They can also be saved as shared “negative keyword lists” and applied across multiple campaigns simultaneously.

Purpose & Benefits

1. Eliminate Wasted Ad Spend

Every irrelevant click costs money. In Google Ads, you pay each time someone clicks your ad regardless of whether that person is a qualified prospect. A plumber bidding on “plumber” without negative keywords will pay for clicks from people searching “plumber jobs,” “plumber apprenticeship,” and “plumber meme.” Negative keywords filter out these non-converting queries and redirect that budget toward people who actually need plumbing services.

2. Improve Campaign Performance Metrics

Negative keywords improve click-through rate (CTR) by ensuring ads only show in relevant contexts — which also improves Quality Score. Google’s Quality Score (a measure of ad relevance, expected CTR, and landing page experience) directly affects your cost per click. Higher Quality Scores mean lower costs and better ad placement. Removing irrelevant impressions from the denominator meaningfully improves CTR, which feeds into Quality Score improvements.

3. Refine Audience Targeting Within Ad Groups

Negative keywords help prevent your ad groups from competing with each other — a problem called keyword cannibalization. If you have one ad group for “emergency plumber” and another for “plumber installation,” adding “emergency” as a negative to the installation ad group ensures searchers who clearly need urgent help see the emergency-focused ad and landing page. The right message reaches the right searcher at the right moment.

Examples

1. Home Services Contractor

A roofing company runs Google Ads targeting “roof repair” and “roof replacement.” Their initial Search Term Report (the report showing what people actually typed when their ad appeared) reveals clicks for “roof repair DIY,” “roof repair cost per square foot for contractors,” and “roof repair job listings.” They add “DIY,” “yourself,” “job,” “career,” and “contractor work” to their negative keyword list — cutting wasted spend by approximately 15% in the first month.

2. Software Company with a Freemium Product

A B2B software company offers a paid CRM tool. Their ads for “CRM software” appear for searches like “free CRM software,” “CRM software open source,” and “CRM software for nonprofits discount.” Since their product isn’t free and doesn’t target nonprofits, they add “free,” “open source,” and “nonprofit” as negatives. Their average cost per conversion drops because the remaining clicks are from buyers with real budget intent.

3. Campaign-Level vs. Ad-Group-Level Negatives

An e-commerce retailer selling new clothing adds “used,” “vintage,” and “second hand” as campaign-level negatives — these apply everywhere. Within a specific ad group for “men’s dress shoes,” they also add ad-group-level negatives for “women’s” and “kids'” to prevent overlap with their other ad groups. This two-tier approach keeps the overall campaign clean while giving individual ad groups fine-tuned control.

Common Mistakes to Avoid

  • Never reviewing the Search Terms Report — Negative keywords only work if you know what terms to exclude. The Search Terms Report in Google Ads shows the actual queries that triggered your ads. Reviewing it weekly, especially for new campaigns, is the primary way to discover negative keyword opportunities.
  • Adding negatives that block valid traffic — Being too aggressive can prevent legitimate clicks. Adding “cheap” as a negative might block searchers who ultimately convert. Review your Search Terms Report with nuance — high conversion rate at low CPC is the goal, not just eliminating any query that seems tangential.
  • Forgetting informational and navigational queries — Searches containing “how,” “what,” “who,” and “why” often indicate informational intent rather than purchase intent. For most commercial campaigns, these make good broad match negative candidates — though exceptions exist if you’re running content-focused ads.
  • Setting and forgetting — Negative keyword management is ongoing. As your campaigns mature, new irrelevant queries will appear, products or services may change, and seasonal patterns may emerge. A monthly review of the Search Terms Report keeps your negative keyword list current.

Best Practices

1. Build a Starter Negative List Before Launching

Before a campaign goes live, create a baseline negative keyword list covering obvious irrelevancies: job/career terms (“jobs,” “salary,” “hiring,” “careers”), DIY terms if you sell professional services, competitor-related terms you don’t want to target, and any terms describing things you don’t sell. This prevents early budget waste while the campaign starts gathering Search Terms data.

2. Use Match Types Strategically

Apply negative keywords at the right specificity level. Broad match negatives cast a wide net — useful for categories of irrelevant terms (like “jobs”). Exact match negatives protect against blocking legitimate related queries while filtering a single specific phrase. In practice, a combination works best: broad match for clear category exclusions, phrase and exact match for nuanced situations where partial matches might be valid.

3. Organize Negatives in Shared Lists

Google Ads allows you to create shared negative keyword lists that can be applied across multiple campaigns simultaneously. Rather than adding the same 50 irrelevant terms to every individual campaign, create a master “Brand Exclusions” list, an “Informational Query” list, and an “Employment/Career” list — then apply each list to all relevant campaigns. Updates to the shared list automatically apply to every attached campaign.

Frequently Asked Questions

How many negative keywords should a campaign have?

There’s no ideal number — it depends entirely on your industry, campaign age, and budget. New campaigns typically start with 20–50 baseline negatives and grow the list as Search Terms data accumulates. Well-maintained campaigns often have hundreds of negatives across campaigns and ad groups. Quality matters more than quantity: the right negatives, applied at the right level, are what move the needle.

Do negative keywords affect my Quality Score?

Not directly — Quality Score is calculated at the keyword level for the keywords you’re actively bidding on. However, negatives improve your overall CTR by removing irrelevant impressions from the denominator, and higher CTR is one input into Quality Score. The indirect effect is positive.

Can negative keywords cause my ads to stop serving entirely?

Yes, if you add negatives that conflict with your positive keywords. Adding an exact negative that exactly matches one of your positive keywords will prevent that keyword from triggering ads. Review your positive keyword list when adding broad match negatives to avoid unintended conflicts.

Should I add competitor names as negative keywords?

Not necessarily. Bidding on competitor brand names is a legitimate — if expensive — strategy to capture searchers comparing options. Whether to target or exclude competitor terms depends on your budget, competitive position, and campaign goals. If you’re not actively targeting competitors, adding their brand names as negatives keeps campaigns focused on people searching for your category rather than a specific competitor.

Related Glossary Terms

How CyberOptik Can Help

Getting negative keywords right takes strategy, consistent execution, and regular attention — all things our marketing team delivers for clients running PPC campaigns. Whether you need help setting up a new Google Ads account, cleaning up an underperforming campaign, or building a negative keyword strategy from scratch, we can help. Explore our marketing services or get in touch.