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What Are Negative Keywords?

Answered 20 August 2026 · Written and reviewed by Chris Krassnig

The Short Answer

Negative keywords are search terms you tell Google Ads not to show for, so your budget only chases searches that can sell. Search campaigns take broad, phrase or exact negatives. Scaley AI mines bad search terms daily and hands you the exclusion to approve, and we build Scaley, so weigh that.

What a Negative Keyword Blocks

Google puts it plainly: negative keywords let you exclude search terms from your campaigns and help you focus on only the keywords that matter to your customers. You are not bidding on anything here. You are telling Google where not to spend your money.

For Search campaigns you can use broad match, phrase match or exact match negative keywords, the same three types you already use on the positive side. Google's help page spells out how each one matches, and it is worth reading once before you paste a long list in.

The Trap That Costs Real Money

Most people miss one line in Google's own documentation. Negative keywords do not match to close variants, so your ad can still show on a search that is a near miss of the word you blocked. Block one spelling and the next spelling is still live.

So blocking a word rarely finishes the job. You block the term, then you read the search terms report again next week and block what got through.

The other trap runs the other way. Google warns that if you use too many negative keywords, your ads might reach fewer customers. A giant inherited block list is one of the quietest ways an ecom account starves itself. Read the list you inherited before you add to it.

One thing worth knowing about scale: Google says an account-level list of negative keywords applies automatically to all eligible search and shopping inventory in the relevant campaign types. So one good list covers a lot of ground at once.

The Search Terms Report Is the Whole Job

By hand it is a weekly job. Open the search terms report, sort by cost, read what people really typed, and exclude what could never buy. On a small account that is twenty minutes and it works fine.

Scaley AI does it daily instead. Negative keyword mining runs every day, not every quarter, and every bad search term arrives with the evidence and a one-click exclude. Nothing is excluded until you approve it. We built it, so judge that claim harder than the rest.

If you would rather a tool just applied the change for you, look at Opteo. It says its improvements can be pushed live to Google Ads in seconds, and it lists "Exclude Bad Traffic" as one of its jobs. That is a real difference and it is not in our favour when speed is what you want. Scaley stops and waits for your yes on purpose. Pick the one that matches how much you want to be asked.

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