Negative keywords are the single most useful control a small advertiser has in Google Ads, and they are the one most small accounts never touch. They do not make your ads reach more people. They stop your ads from reaching the wrong ones, which on a modest ad budget is worth considerably more.
If you have ever opened a search terms report and found you paid for clicks from people looking for a job, a free template, a repair you do not offer or a competitor by name, you have already met the problem. Here is how the exclusion system works, where to set it up, and how to build a list from your own data instead of a generic one off the internet.
What Are Negative Keywords?
A negative keyword is a term you tell Google to exclude, so your ad is not eligible to appear for searches containing it. It is subtraction, not targeting.
The reason they matter so much for a small business is that modern Google Ads campaigns are deliberately loose. Broad match, Smart Bidding and Performance Max are all built to find searches you did not think of, which is genuinely useful and also means the system will happily test queries that have nothing to do with your business. Exclusions are the fence around that.
A plumber who only handles residential work excludes commercial. A law firm that does not take a practice area excludes it by name. A boutique excludes wholesale and bulk. Each one removes a slice of traffic that was never going to become a customer, which lifts the click through rate and the conversion rate of everything that remains.
How Negative Keyword Match Types Work
Exclusions use the same three match types as regular keywords, but they behave differently, and this is where most accounts go wrong.
- Broad match negative. Written plainly, with no punctuation. The search is blocked only when it contains every one of your words, in any order. It does not expand to synonyms the way a broad positive keyword does.
- Phrase match negative. Written in quotation marks. Blocks searches containing your exact phrase in that order, with other words allowed around it.
- Exact match negative. Written in square brackets. Blocks only the exact search, nothing wider.
Now the part that catches almost everyone. Google’s own documentation on how negative keywords work states that they do not match close variants. Your positive keywords quietly expand to plurals, misspellings and near variations. Your exclusions do not. If you block the word job, you have not blocked jobs. If you block a commonly misspelled term, the misspelling still runs.
So when you exclude something that matters, add the obvious variations at the same time: the plural, the singular, the common misspelling and the synonym your customers actually use.
Where to Add Negative Keywords
There are four levels, and picking the right one is the difference between a clean account and a mess you cannot audit later.
- Ad group level. Narrow surgery. Use it to keep two of your own ad groups from competing for the same search.
- Campaign level. The workhorse. Exclusions that apply to everything in one campaign but not to the others.
- Shared lists. Built once in the shared library and applied to many campaigns at once, per Google’s guidance on negative keyword lists. This is where your standing exclusions belong, so you edit them in one place.
- Account level. A blanket exclusion across every campaign in the account, described in Google’s documentation on account level negative keywords. Reserve it for things that should never be true anywhere, such as terms unrelated to your industry.
Performance Max used to be the exception here. Google opened campaign level exclusions to Performance Max in January 2025 and later raised the ceiling well past the original limit, so an automated campaign is no longer a black box you cannot fence. If you are running Performance Max without a single exclusion in place, that is the first thing to fix.
How to Find Your Own Negative Keywords
Skip the downloadable master lists. The exclusions worth having come from your own search terms report, which shows the real queries that triggered your ads rather than the keywords you bid on. Google documents the workflow for pulling negative keyword ideas from that report.
The routine is simple and takes about fifteen minutes. Open the search terms report for the last thirty days. Sort by clicks, highest first, so you are reading the queries that actually took your money. Go down the list and ask one question of each: could this person ever become a customer? Anything that is a clear no becomes an exclusion, added at the level that makes sense.
Patterns show up fast. Most small accounts find the same families of waste: people looking for employment with you rather than service from you, people looking for instructions so they can do the work themselves, people hunting for a free version, people searching a product or service you do not carry, and people typing a competitor’s brand name. Handle the pattern, not just the one query, or you will be back next week blocking its cousin.
Mistakes That Make Exclusions Backfire
It is possible to over correct, and the damage is invisible because blocked traffic never shows up in a report.
- Blocking a word that appears in your own keyword. An exclusion beats a keyword every time, so the campaign quietly stops serving. Check for conflicts whenever a campaign goes silent.
- Excluding a category too broadly. Blocking a single common word at the account level can wipe out a large amount of legitimate demand. Be narrower than feels necessary.
- Blocking research language. Terms like how and what often precede a real buyer who is early. Exclude them only if your data says those clicks never convert.
- Setting it up once and walking away. The system keeps finding new queries, so waste returns. Put a recurring reminder on the calendar.
- Adding everything on day one. With no performance data yet, a long guessed list mostly blocks searches you would have wanted to learn from.
Exclusions are one lever among several, and they work best inside a campaign that is already pointed at the right audience. Our overview of paid advertising for small business covers how the auction, targeting and measurement fit together, and our honest look at whether Google Ads are worth it is the right read if you are still deciding whether to run search ads at all.
Frequently Asked Questions About Negative Keywords
What are negative keywords in Google Ads?
They are terms you tell Google to exclude, so your ad does not appear for searches containing them. A roofing company that only replaces roofs might exclude the word repair. They do not add reach, they subtract it, which is how they protect a small advertiser from irrelevant clicks.
How many negative keywords should I add?
Enough to block the patterns you can see in your search terms report, and no more. Most small accounts run well with a shared list of common exclusions plus a handful specific to the campaign. Adding hundreds of guesses up front usually blocks searches you would have wanted.
Do negative keywords block plurals and misspellings?
Not automatically. Google’s documentation is explicit that negative keywords do not match close variants, so the plural, the misspelling and the synonym each have to be added yourself if you want them excluded. This is the opposite of how your regular keywords behave, and it surprises most advertisers.
Can I use negative keywords in Performance Max?
Yes. Google opened campaign level exclusions to Performance Max in January 2025 and later raised the limit substantially, so you no longer have to route the request through a representative. Account level exclusions also apply to Performance Max alongside every other campaign type in the account.
How often should I review my negative keywords?
Weekly while a campaign is new, then monthly once the search terms settle. Open the search terms report, read what people actually typed, and exclude the patterns that will never convert. Waste creeps back in as Google finds new queries, so this is maintenance rather than a one time setup.
Start With One Report
You do not need a strategy document to begin. Open the search terms report, read the top twenty queries by clicks, and exclude the ones that were never going to buy. That single pass usually removes more waste than any bid adjustment a small account will make this month, and negative keywords keep working quietly once they are in place. Then set a monthly reminder and do it again, because the list is a living thing rather than a setup step. If you are also building the return path for people who did visit, our explainer on retargeting ads covers the other side of the same funnel.
Get More From the Ad Budget You Already Have
Most small accounts do not need to spend more, they need to stop paying for the wrong clicks, which is where our paid advertising services start. If your campaigns are running but you cannot tell which searches are actually producing customers, contact Demur Design and we will read the account with you. For more plain English breakdowns like this one, you can subscribe to the Demur Design newsletter in the footer below.
This article is researched and drafted with AI, then reviewed, fact-checked, and published by Demur Design.
