Quick answer. Negative keywords are words or phrases that block your ad from showing on searches you do not want. Because broad and phrase match let your ad appear on loosely related queries, you end up paying for irrelevant clicks. You find them in the search terms report, then add them at the ad group, campaign, or shared-list level. Doing this weekly keeps your spend on searches that can actually become customers.

When I hand a new media buyer their first campaign, the thing they always miss is negative keywords. They obsess over the keywords they want and forget about the searches they never wanted to pay for.

Google will happily show your ad on searches that have nothing to do with what you sell. Negative keywords are how you tell it to stop. They are one of the simplest ways to protect your budget, and most beginners ignore them for far too long.

What are negative keywords and why do you need them?

A regular keyword tells Google when to show your ad. A negative keyword tells Google when to hold it back. If you sell premium running shoes and you add free as a negative keyword, your ad will not show when someone searches for free running shoes.

The reason you need them comes down to match types. When you use broad match or phrase match, Google does not only match the exact words you picked. It matches anything it thinks is related. That is useful for reach, but it also means your ad shows on searches you never intended.

So a keyword like running shoes can trigger your ad on searches for free running shoes, running shoe jobs, or how to clean running shoes. None of those people want to buy from you, but every click still costs money. Negatives close those doors.

How do loose match types waste your money?

Here is what actually happens inside the account. You bid on a keyword, Google enters you into auctions, and broad match pulls you into auctions for queries that share intent or theme with your keyword. Some of those are great. Some are pure waste.

Picture a small example. You spend 30 dollars a day on a phrase match keyword, and 8 dollars of that goes to searches with the word free in them. That is 8 dollars a day, around 240 dollars a month, paying for people who told you in the search box that they will not pay. Add free as a negative and that 240 dollars moves to searches that can actually convert.

Multiply that across jobs, DIY, and cheap, and the leak gets serious fast. The money is not lost in one big mistake. It bleeds out a few dollars at a time on searches you would never have chosen by hand.

How do you find wasted spend in the search terms report?

The search terms report is the single most useful screen in Google Ads, and almost no beginner opens it. It shows the actual searches people typed before they clicked your ad, not the keywords you bid on. That gap is where the waste hides.

Open it inside your campaign or ad group, then read down the list with one question in mind: would I have paid for this click on purpose? When you spot a search that has nothing to do with what you sell, you have found a negative keyword.

  • Sort by cost to see which irrelevant searches drained the most money.
  • Look for words like free, jobs, cheap, salary, course, and DIY.
  • Check searches with clicks but zero conversions over a decent window.
  • Watch for the wrong intent, like someone looking to repair when you sell new.

Each search you flag becomes a candidate for your negative list. You are not guessing here. You are reading real data about where your money went.

Where should you add negatives: ad group, campaign, or a shared list?

You have three places to add a negative, and the right one depends on how widely you want it to apply.

  • Ad group level: blocks the term for one ad group only. Use this when a search is bad for one product but fine for another.
  • Campaign level: blocks the term across every ad group in that campaign. Good for waste that applies to the whole campaign.
  • Shared list level: a negative keyword list you build once and apply to many campaigns at the same time. This is where your universal junk lives.

I keep a shared list with the words I never want in any account, things like free, jobs, salary, and DIY. Then I use campaign and ad group negatives for the cases that are specific to one product or one offer. Start the shared list early and add to it every week. It compounds into a strong filter over time.

What about negative match types and a weekly habit?

Negatives have match types too, and they work a little differently from regular keywords. Negative broad blocks a search only if it contains all your words in any order. Negative phrase blocks searches that contain your words in order. Negative exact blocks only the exact search and nothing else.

One thing to watch: negatives do not expand to close variants the way positive keywords do. If you block running, it will not automatically block runners. Add the variations you actually see in the report so nothing slips through.

The real win is turning this into a habit. Once a week, open the search terms report, scan the new searches, and add negatives for anything irrelevant. Fifteen minutes every Monday keeps the leaks closed and your budget pointed at people who can become customers. The accounts that quietly perform are the ones where someone does this without fail.

Key takeaways

  • Negative keywords stop your ads from showing on searches you never wanted to pay for.
  • The search terms report shows the real searches behind your clicks, which is where wasted spend hides.
  • Use a shared list for universal junk and add campaign or ad group negatives for specific cases.
  • Mine the search terms report weekly so the leaks stay closed.

Frequently asked questions

Should I add competitor brand terms as negatives?
It depends on your goal. If bidding on a competitor name is bringing in cheap clicks that never convert, add it as a negative and save the money. But if those searches do convert for you, keep them. Look at the data in your search terms report before you decide. Do not block a competitor term out of habit when it is actually paying for itself.
How many negative keywords is too many?
There is no hard limit you will hit in a normal account, so do not worry about the number. The risk is not quantity, it is blocking good traffic by accident. Add negatives that clearly waste money, and avoid broad ones that might catch searches you want. Review your list now and then to make sure an old negative is not quietly choking a good keyword.
Can negative keywords hurt my campaign?
Yes, if you are careless. A broad negative like shoe could block dozens of good searches at once. That is why match type matters. Use negative phrase or exact when you want to be precise, and double check what a negative will block before you save it. Used carefully, negatives only remove waste. Used carelessly, they can starve a campaign that was working fine.
How often should I check the search terms report?
Weekly is a good rhythm for most accounts. New searches show up constantly, so a once-and-done cleanup will not hold. On bigger budgets you might look every couple of days. Block out fifteen minutes, scan the new terms, and add negatives for anything irrelevant. The habit matters far more than the exact schedule you pick.