How do negative keywords save you money?

Negative keywords tell Google: ‘Do not show my ad when this word appears in the search.’ A negative of ‘free’ stops your ‘marketing agency’ ad from showing for ‘free marketing agency templates.’ Negatives don’t improve Quality Score directly but they reduce wasted spend on searches that will never convert — often the single biggest lever in a new account.

Apply negatives at three levels: (1) ad group — for negatives unique to that theme, (2) campaign — for negatives that apply to all ad groups in the campaign, (3) shared negative lists — for negatives that apply across all campaigns (like ‘jobs,’ ‘career,’ ‘free,’ etc.). Shared lists save hours and prevent drift. Every account should have a ‘Master Negatives’ shared list from day one.

The single most valuable 10 minutes of your week: pull the search terms report, sort by cost descending, and look for searches that spent money without converting. For each low-intent query, add it as a phrase or exact negative. Do this daily for the first month, weekly after. Healthy accounts add 10–30 new negatives per week — that cadence alone separates profitable accounts from unprofitable ones.

Every lead-gen account needs these starter negatives: ‘free, cheap, DIY, template, tutorial, course, how to, jobs, career, salary, resume, internship, reddit, wikipedia, wiki, meme, vs, comparison.’ Service-specific additions: wrong geography (‘USA,’ ‘India,’ ‘UK’ if you’re Canada-only), wrong industry tools if you sell services (not tools), and generic category terms that don’t convert.

Negatives have match types too — but they behave slightly differently. Exact negatives block only the specific phrase. Phrase negatives block any query containing that phrase. Broad negatives block queries with those terms in any order. Start with phrase for most negatives (the right balance), use exact for head terms you only want to block in specific contexts, and avoid broad negatives unless you really mean it — they’re easy to over-block with.

Never. But the cadence slows. New accounts add 10–30/day. Mature accounts add 5–20/week. Once you have 500+ negatives in a campaign and your new negatives are stopping fewer than 1 wasted click per week, diminishing returns set in — but keep the weekly review anyway. New queries appear constantly as Google’s matching evolves; one month off can undo three months of cleanup.