Negative keywords tell Google which searches your ads must not appear for. On a small budget they are the fastest way to stop paying for clicks from people who were never going to buy. A starter list built on day one, then trimmed weekly from real search data, usually does more for efficiency than any bidding setting.
The idea is simple, but the details trip up many accounts. Negatives behave differently from normal keywords, match types work differently, and one careless negative can quietly switch off your best traffic. This guide shows how to build a starter list, how match types work for negatives and how to maintain the list without it turning into a mess.
Why do negative keywords matter more on a small budget?
When you spend thousands a month, a few wasted clicks barely register. When you spend €300 or €600, ten irrelevant clicks at €2 each is a noticeable share of your month. Google’s matching has also become broader over the years: your keyword can trigger on searches that only share the intent in a loose way. Negative keywords are your brake on that.
They are also free. There is no direct cost to adding them, and every negative added correctly turns future wasted spend into budget for relevant clicks.
What goes into a starter list?
You do not need hundreds of terms at the start. Build five buckets and fill each with the words that fit your business.
1. Free and do-it-yourself intent
Words like free, template, diy, how to, tutorial, course and pdf. Be careful: if you sell courses or templates, these are exactly the terms you want. The list must match your offer.
2. Jobs and careers
Words like jobs, career, salary, internship, vacancy, hiring and resume. Almost every business attracts job seekers searching for its category.
3. Wrong product or service
Terms for neighbouring things you do not offer. A bakery selling cakes might exclude cake mix, cake decorating supplies, recipe. Your own sales enquiries and past mistakes are the best source.
4. Research-only terms
Words like definition, meaning, wiki, history, statistics and examples. These usually signal learning, not buying. Again, check against your funnel before blocking them.
5. Places and audiences you do not serve
Countries, cities or customer types outside your reach. If you only serve businesses, add for kids or personal if that is a common confusion. Combine this with proper location targeting; negatives are a backup, not a replacement.
How do match types work for negatives?
This is where most mistakes happen. Negatives follow stricter rules than regular keywords.
| Negative match type | How it behaves | Example |
|---|---|---|
| Broad (no symbols) | Blocks the search only if it contains all the words, in any order. Does not block close variants. | Negative free template blocks “template free download” but not “free pricing”. |
| Phrase (quotation marks) | Blocks searches that contain the words in that order, with extra words allowed around them. | Negative "free template" blocks “best free template for ads”. |
| Exact (square brackets) | Blocks only that exact search. | Negative [cheap ads] blocks only “cheap ads”. |
Two traps follow from this. First, a broad negative with several words is narrower than most people expect, because all the words must appear. If you want to block either word, add them as separate negatives. Second, negatives do not expand to plurals, misspellings or synonyms. If you add job but not jobs, you may still pay for the plural. Add the variants you see.
For single words that are clearly irrelevant, use phrase or broad. For risky terms that might hide valuable searches, use exact so you only block the specific query.
Where should you put the negatives?
Account level or shared lists for universal negatives such as jobs and free-intent words. Campaign level for negatives that apply only to one product line. Ad group level when you want two ad groups not to compete for the same query: for example, a negative for your premium service inside the budget service group.
A shared negative list lets you add a term once and apply it across all campaigns. For a small account, one shared “universal negatives” list plus a few campaign-specific ones is plenty.
How do you keep adding the right negatives?
Your starter list comes from guesses. The real list comes from the search terms report, which shows what people actually typed. We describe a short weekly routine in our 30-minute search terms report routine. The core steps are:
- Sort by cost, not clicks.
- Mark terms with spend but no conversion and an obviously wrong intent.
- Add them as negatives with the right match type.
- Leave terms that are merely unproven alone for a few weeks. A search with two clicks and no sale is not a verdict.
- Write the change in a simple log: date, term, reason.
The log matters. Three months later, when a campaign suddenly loses volume, you can check whether a negative is the cause.
What mistakes should you avoid?
- Blocking your own brand or product names through a careless broad negative.
- Adding conflicting negatives. Google warns when a negative blocks one of your own keywords. Act on it.
- Over-pruning. If every uncertain term gets blocked, you cut off discovery. Keep a bias toward blocking clear waste only.
- Relying on negatives to fix poor targeting. If your keywords are too broad or your landing page does not match, the root cause is elsewhere. See our notes on ad and landing page message match.
A quick example of the maths
Imagine an illustrative account spending €600 a month at an average click cost of €1.50, which buys about 400 clicks. If a quarter of those clicks come from searches such as “free”, “jobs” or “how to”, that is around 100 clicks and €150 a month going to people with no purchase intent. Even if only half of that waste is removable with sensible negatives, you free up about €75 a month, or one extra campaign test every quarter, without raising the budget.
The numbers will differ for your account, but the logic holds: the smaller the budget, the larger the share that careless matching can take. That is why we treat the negative list as part of the launch checklist rather than a later optimisation.
Should you use broad match keywords with negatives as a safety net?
Some advertisers use broad match keywords and rely on negatives to clean up. It can work for accounts with a strong conversion signal and daily attention, because broad match gives the algorithm room to find new queries. On a small account with little data it is risky, since you pay for every irrelevant query before you can block it. A safer path is to start with phrase and exact match, watch the search terms, and widen only when you have enough conversions to guide the system.
A day-one checklist
- Create one shared list called “Universal negatives” and attach it to every campaign.
- Fill the five buckets with 30 to 60 terms that fit your business.
- Add plural and common spelling variants.
- Choose match types deliberately: phrase for clear waste, exact for ambiguous terms.
- Book a weekly 30-minute slot for the search terms report.
- Keep a change log.
If you inherit an account and want to see how a full review fits around this, our write-up of how we audit a Google Ads account in under two hours shows where negatives sit in the sequence.
The bottom line
Negative keywords will not rescue a poor offer, but they quietly protect every euro of a small budget. Build the starter list, respect the match type rules, and let real search data guide the rest. A tidy list and a short weekly habit will pay for themselves faster than almost any other change you can make in the account.