A negative keyword is a word or phrase that stops your ad from showing for a search. It is the opposite of a normal keyword: instead of telling Google when to show your ad, it tells Google when not to show it. Used well, a short negative keyword list can save a surprising amount of budget, because it blocks clicks from people who were never going to buy from you.
Why negatives matter more than new keywords
Beginners usually focus on adding keywords. That makes sense, but adding keywords without negatives is like opening a shop door to everyone on the street, including people looking for something you do not sell. If you sell paid accounting software, searches for “free accounting software,” “accounting jobs,” and “accounting course” can all trigger your ads if your keywords are broad. Each of those clicks costs money and almost never leads to a sale.
Negative keywords also improve your data. When irrelevant clicks are removed, your click-through rate, conversion rate, and cost per conversion start to reflect real buyers, not curious browsers. That makes later decisions easier, because you are no longer guessing whether a keyword is weak or whether it was simply shown to the wrong people.
The starter list: words to check first
Every business is different, but a useful starter list covers the same themes. Start with intent words: free, cheap in the sense of a giveaway, jobs, hiring, career, salary, course, training, tutorial, DIY, how to, template, and review if you do not want comparison traffic. Then add business-model mismatches: wholesale, supplier, manufacturer, franchise, or reseller, if you sell direct to customers only.
Next, add location words for places you do not serve, and competitor or brand names you do not want to pay for, unless you have a clear reason to bid on them. Finally, add product mismatches: if you sell new products, consider used, refurbished, rental, or repair as negatives, and if you sell a service, consider software, app, or parts. Do not copy a list blindly. Go through each word and ask: would a person searching with this word ever become my customer? If the answer is clearly no, it belongs on the list.
Match types for negatives
Negative keywords also have match types, and they work a little differently from normal keywords. A broad negative blocks any search that contains all the words in the negative, in any order, plus close variants. A phrase negative blocks searches that contain the exact phrase in order. An exact negative blocks only that exact search, with close variants.
For beginners, phrase negatives are often the safest starting point for multi-word phrases, because they are more precise than broad negatives but less fiddly than exact negatives. A broad negative made of one common word, such as “free,” can be powerful, but check it carefully: if you offer a free consultation, blocking “free” everywhere could remove the very people you want. When in doubt, start narrower, watch the search terms report, and widen only when you see repeated waste.
A worked example: a dog grooming business
A dog groomer in one city bids on “dog grooming” and gets 200 clicks in a month at $1.50 each, or $300. In the search terms report, 40 clicks came from “dog grooming jobs,” “dog grooming course,” “free dog grooming,” and “dog grooming near” a city 200 miles away. Those 40 clicks cost $60 and produced no bookings.
By adding jobs, course, free, and the distant city as negatives, the groomer saves about $60 a month. That money can then go to better keywords, such as “dog grooming near me” in the home city, or to a higher bid on the ad group that already books appointments. The total budget did not change, but the share spent on real buyers went up.
Where to add negatives, and how often
Add negatives at campaign level when a word is wrong for the whole campaign, and at ad group level when it is wrong for one group only. For example, “jobs” is usually wrong everywhere, while “puppy” might be wrong for an adult-dog service but right for a puppy package. If you run several campaigns, a shared negative list can save time, but only share words that are truly wrong across all of them.
Review negatives alongside the search terms report every week. Remove a negative if you later add a service it blocks, and add new negatives when new irrelevant patterns appear. A negative list is not a one-time task; it is a living filter that gets sharper as you learn what your customers actually search for.
Your simple negative keyword checklist
- Check the search terms report and sort by cost.
- Block job, course, free, DIY, and template searches if they do not fit your offer.
- Block locations you do not serve and products you do not sell.
- Use phrase negatives for multi-word phrases you want to block precisely.
- Put campaign-wide blocks at campaign level and group-specific blocks at ad group level.
- Review the list weekly and remove anything that now blocks a real service.
- Record what you saved, so you can see the value of the habit.
Practical summary
Negative keywords are not advanced or complicated. They are a simple “do not show my ad for this” list, and they protect your budget from the searches that will never convert. Start with the themes above, check your search terms weekly, and keep the list honest and up to date. Done consistently, this one habit often pays for itself many times over.