Negative keywords are search terms you tell an ad platform not to match with your ads. In Google Ads and Microsoft Advertising, they prevent your campaigns from showing on irrelevant searches, which helps protect budget, improve lead quality, and make reporting cleaner.
Why negative keywords matter
Negative keywords reduce wasted spend by filtering out clicks from people who are unlikely to convert. If you sell premium software, for example, you may want to exclude searches containing “free,” “jobs,” “template,” or “course” depending on your offer. That keeps your ads focused on commercial intent instead of research, hiring, or DIY traffic.
They also improve campaign control. Better filtering usually leads to stronger click-through rates, more relevant search term data, and clearer performance by ad group or campaign. For marketers managing lead generation, ecommerce, or SaaS acquisition, negative keywords are one of the fastest ways to improve efficiency without changing bids or creative.
How to build a negative keyword list
Start with search term reports
Review the actual queries that triggered your ads. Look for patterns tied to low conversion rates, low average order value, or poor lead quality. Common categories include informational intent, support queries, competitor research, education terms, and bargain hunting.
Group negatives by intent
Build lists around themes such as “free,” “careers,” “customer service,” “review,” “meaning,” or unrelated product types. Apply broad business-wide exclusions at the account level when possible, then add campaign-specific negatives where intent differs by offer.
Match negatives to campaign structure
Use negative keywords to stop overlap between campaigns. If one campaign targets branded traffic and another targets non-brand terms, add brand negatives to the non-brand campaign. If you separate products by category, exclude sibling categories from each campaign to keep reporting accurate and routing clean.
Practical example
If TLSubmit were promoting a paid directory submission service for startups, a useful keyword might be “submit startup to directories.” Strong negative keywords could include “free,” “internship,” “job,” “resume,” “template,” and “what is directory submission.” This setup helps avoid paying for users looking for employment, educational content, or no-cost resources instead of a done-for-you service.
A practical workflow is simple: pull the search terms report weekly, sort by spend and conversions, mark irrelevant queries, add them to shared lists, and review impact after 7 to 14 days. For larger accounts, separate your negatives into universal exclusions, campaign routing terms, and offer-specific filters so you can scale updates without breaking high-intent traffic.