How account-level negative keywords work
A normal negative keyword is added to one campaign or one ad group and only affects that. An account-level negative is stored once, at the top of the account, and applies everywhere beneath it — including campaigns you have not built yet. Add a term there and every campaign in the account stops being eligible for searches that match it.
Matching follows the same rules as any other negative keyword: broad, phrase and exact behave as they normally do, and close variants are not blocked automatically unless you add them. The list is capped, so it is not a dumping ground for every exclusion you have ever written; it is for the small set of terms that no campaign in the account should ever match.
Why account-level negative keywords matter
They solve a problem that grows with account size. In a single-campaign account, one negative list is easy to keep tidy. Across a dozen campaigns, the same unwanted term has to be added a dozen times, and the campaign somebody forgets is the one that spends on it. Holding the exclusion once removes that failure mode entirely.
They are also the cleanest place for brand safety and sensitivity terms. Words tied to complaints, legal disputes, adult content, competitors you have agreed not to bid on, or a product you no longer sell belong at account level, because there is no campaign for which an exception would be reasonable. In a market like Nepal, where a small number of campaigns often share one busy account, this is usually the quickest saving available.
Common mistakes with account-level negative keywords
The biggest is scope creep. A term added because one campaign was wasting money on it stays there forever, and later blocks a service line the business genuinely launches. Because the list sits away from the campaign screens, nobody looks at it when volume drops, and the cause can hide for months.
The other mistake is over-broad matching. A single-word broad negative can knock out a large family of useful searches, and at account level there is no campaign left to catch them. Adding a common word here is a much bigger decision than adding it to one ad group.
How to act on it
Set a rule for what qualifies before you add anything: only terms that would be wrong for every campaign, now and in the foreseeable future. Everything else stays in campaign-level shared lists, where it can be removed from one campaign without touching the rest.
Then build the habit of reading it. Review the list whenever you launch a new service, take on a new product line, or inherit an account, and check it first when a campaign loses volume without an obvious cause. Mine the search terms report for candidates rather than guessing at words, and keep a short note of why each one was added — the reasoning is what future you will be missing. Ongoing Google Ads management should treat this list as something reviewed on a schedule, not written once.