Negative Keywords: How to Stop Wasting Google Ads Budget

Most Singapore advertisers obsess over which keywords to bid on. Far fewer spend any time on the keywords they should be blocking — and that is where a large share of wasted budget quietly disappears. Negative keywords are the setting that tells Google, “no matter how relevant this search looks to your system, do not show my ad for it.” Get them right and the same monthly budget buys a materially higher share of genuine enquiries. Ignore them and you pay full price for clicks from people searching for free templates, job vacancies, DIY tutorials, or a service you don’t even offer. This guide explains, in plain English, exactly how negative keywords work in 2026 — the three negative match types, the close-variant trap almost everyone gets wrong, where negatives live in the account, how they now work with Performance Max, and how we build a negative list that protects budget from day one.

If you want the big-picture view first, start with our complete Google Ads guide for Singapore SMEs. This post zooms into one of the most under-used levers in the whole platform.

What a negative keyword actually does

A regular keyword tells Google which searches you want to appear for. A negative keyword does the opposite: it tells Google a word or phrase that should prevent your ad from showing, even when your bid keywords and Google’s matching system would otherwise let the search through. It is a veto, not a bid.

This matters because of how loosely modern keyword match types now cast their net. Broad and phrase match deliberately reach beyond the literal words you typed, pulling in related searches Google judges to share your intent. That reach is useful for discovery, but it also drags in searches that are related to your topic yet worthless to your business — people looking for jobs, free tools, courses, or the cheapest possible option when you sell premium. Negative keywords are how you cut those out without narrowing your real targeting.

The simplest way to think about it: match types decide what you are willing to pay for; negatives decide what you refuse to pay for. You need both working together. Tightening match types alone still lets irrelevant close variants through; a negative list alone can’t compensate for targeting that is far too broad. Used as a pair, they are the single most reliable way to stop budget leaking — which is exactly why negatives are one of the first things we audit whenever a client says their Google Ads aren’t converting.

The three negative match types

Just like normal keywords, negatives come in broad, phrase and exact — but the rules are different, and the differences catch people out. Here is how each behaves, per Google Ads Help.

Two rules trip up almost every new advertiser:

• Negative broad does not treat function words the way positive keywords do. With a negative broad keyword, the search has to contain every word in your negative for the block to fire. So a negative broad of cheap flights will not block a search for just “cheap” on its own — only searches containing both “cheap” and “flights.”
• There is a 16-word ceiling. Google only checks negatives within the first 16 words of a search query. If someone types a very long query and your negative term appears after the 16th word, your ad can still show. In practice this rarely bites, but it explains the occasional oddity in a search terms report.

The trap nobody warns you about: negatives don’t match close variants

This is the single most important thing to understand about negative keywords in 2026, and it is the opposite of how positive keywords behave. Positive keywords automatically match close variants — misspellings, plurals, and reordered words with the same meaning. Negative keywords do not. Google Ads Help is explicit: negative keywords don’t match to close variants, so your ad might still show on searches that contain close variations of your negative terms.

Read that again, because the consequences are expensive. If you add jobs as a negative, you have not blocked “job,” “job vacancy,” or a misspelling like “jbos.” If you block course, you have not blocked “courses” or “classes.” You have to add every variation you care about yourself — singulars and plurals, common misspellings, and synonyms.

This is why a good negative list is not ten words; it is a living document that grows every week as your search terms report reveals new junk. A renovation contractor’s list, for example, wouldn’t just say diy — it would include diy, do it yourself, tutorial, how to, ideas, hdb bto guide, renovation loan, renovation course, and the plural and misspelled forms of each. The discipline of adding variants is tedious, and it is exactly the discipline that separates an account that leaks from one that doesn’t.

Where negatives live: ad group, campaign, and account level

You can apply negatives at three levels, and choosing the right level keeps your account tidy and your rules consistent.

• Ad group level — narrow, surgical exclusions. Use these to stop one ad group cannibalising another (for example, adding “commercial” as a negative in your residential ad group).
• Campaign level — exclusions that apply to the whole campaign. This is where most of your intent-based negatives (“free,” “jobs,” “salary”) belong.
• Account level / negative keyword lists — a shared list you build once and apply to many campaigns. This is the most efficient home for universal junk you never want to pay for, brand-safety terms, and competitor considerations. A negative keyword list can hold up to 1,000 keywords, and you can apply the same list across campaigns so you maintain it in one place.

A campaign itself can hold up to 10,000 negative keywords, so you are unlikely to hit a ceiling in a normal SME account. The practical advice we give clients: build one shared “universal junk” list (jobs, salary, free, DIY, course, meaning, definition, Wikipedia, and so on) and apply it everywhere, then layer campaign- and ad-group-specific negatives on top. That way a single edit updates every campaign at once.

Negatives and Performance Max in 2026

For years, Performance Max was the blind spot in every negative-keyword strategy: because PMax serves across Search, Shopping, YouTube, Display, Gmail and Discover at once, and matches to broader queries than a normal Search campaign, it was notoriously prone to spending on irrelevant searches — and you couldn’t easily block them. That has changed, and the changes matter.

• Campaign-level negatives for PMax rolled out in January 2025, replacing the old, clunky process of requesting account-level exclusions through a support form.
• In March 2025, Google raised the PMax negative-keyword limit from 100 to 10,000 per campaign, bringing it in line with Search campaigns.
• Also in March 2025, Google released a PMax search terms report, giving advertisers far more visibility into what queries PMax is actually matching — the visibility you need to know which negatives to add.

The upshot for a Singapore advertiser running PMax alongside Search: you should now be adding negatives to PMax too, using its own search terms report, rather than hoping account-level exclusions catch everything. Treat PMax negatives as a routine housekeeping task, not a one-off. If you’re unsure how PMax interacts with your Search keywords in the first place, our Performance Max guide walks through the whole channel mix.

How to build your first negative list

Every business is different, but almost every Singapore SME needs negatives in these categories on day one, before a single dollar is spent:

• Free-seekers: free, gratis, no cost, sample, freeware, template.
• Job hunters: job, jobs, vacancy, hiring, career, salary, internship, part time.
• DIY & learners: diy, do it yourself, how to, tutorial, course, class, training, certification, meaning, definition, what is.
• Bargain hunters (if you’re premium): cheap, cheapest, budget, discount, promo code — only if you don’t compete on price.
• Wrong service or product: anything adjacent that you don’t offer (a commercial cleaner blocking “carpet,” a dental clinic blocking “veterinary”).
• Wrong location: for a Singapore-only business, block “malaysia,” “jb,” “johor,” “philippines” and other markets you don’t serve, so cross-border curiosity searches don’t drain budget.
• Competitor brand names: a judgment call — blocking them keeps you off searches for a named rival; leaving them can be a deliberate conquesting play. Decide on purpose, not by accident.

Then — and this is the part most advertisers skip — add the plural, singular and common-misspelling variants of each, because as we saw, negatives don’t auto-match close variants. “Job” and “jobs” are two separate negatives.

A worked Singapore example

Take an aesthetic clinic in Orchard bidding on “pigmentation treatment.” With no negatives, over a month the search terms report might show clicks for “pigmentation treatment at home,” “pigmentation cream diy,” “pigmentation removal course,” “aesthetic clinic assistant job,” and “cheapest pigmentation treatment.” At a typical Singapore aesthetics cost-per-click — often in the higher SGD 3–6+ band because the category is competitive, as we cover in how much Google Ads cost in Singapore — that is real money spent on people who will never book a paid consultation.

Add a negative list covering diy, at home, home remedy, cream, course, job/jobs, salary, cheapest, and the plural/misspelled variants, and the same budget suddenly concentrates on searches from people who want a clinic to do the treatment. Nothing about the bid changed; the ads didn’t change; the clinic simply stopped buying clicks it never wanted. In the accounts we manage, tightening negatives is one of the fastest, lowest-risk ways to lift the share of spend that turns into enquiries — the kind of before-and-after we document in our case studies.

Finding negatives: a four-step weekly routine

A negative list is only as good as the process that feeds it. Here is the simple weekly routine we run on the accounts we manage — it takes about ten minutes once you’re in the habit:

1. Open the search terms report for the last 7–14 days (Campaigns → Insights & reports → Search terms). This shows the actual queries people typed, not the keywords you bid on — the gap between the two is where waste hides.
2. Sort by cost or clicks, descending. You’re hunting for terms that spent money but clearly don’t match your offer. A pest-control firm seeing spend on “pest control license course” has found a negative.
3. Add the junk as negatives at the right level — universal junk (“jobs,” “free”) to your shared list, campaign-specific junk to the campaign. Choose the match type deliberately: negative phrase for multi-word patterns, negative broad for single intent words.
4. Add the variants. Because negatives don’t match close variants, add the plural, singular and obvious misspellings of anything you just blocked. This is the step people skip, and it’s the step that makes the list actually hold.

Do this weekly for a new or high-spend campaign and the flood of irrelevant terms slows to a trickle within a month or two — at which point a fortnightly check is enough. Don’t forget to run the same routine on your Performance Max campaigns using their own search terms report.

Common negative-keyword mistakes

• Being too aggressive. Overlapping negatives can accidentally block your best keywords. If you add a negative that shares a word with a keyword you’re bidding on, the negative usually wins — and your good keyword goes silent. Always sanity-check new negatives against your active keywords.
• Adding negatives once and never revisiting. New junk appears constantly. The search terms report should be a weekly habit for higher-spend campaigns, not a launch-day task.
• Forgetting close variants. Blocking “job” but not “jobs” leaves half the door open.
• Using the wrong match type. A negative exact of [free] only blocks the single word “free” on its own — useless. For intent words you almost always want negative broad or phrase.
• Ignoring Performance Max. With campaign-level PMax negatives and a PMax search terms report now available, there’s no excuse to leave PMax unmonitored.

How often should you review?

For a typical Singapore SME account, review the search terms report and update negatives weekly while a campaign is new or spending heavily, then settle into a fortnightly rhythm once the obvious junk is cleaned out and new irrelevant terms slow to a trickle. High-spend accounts warrant weekly checks indefinitely, because at higher budgets even a small percentage of wasted clicks is a meaningful dollar figure. Pair this with the same weekly look at your match types and you catch drift from both directions — targeting that’s too loose, and searches that need excluding.

The honest bottom line

Negative keywords are unglamorous, and that is precisely why they are under-used and so valuable. They don’t win awards; they quietly stop you paying for searches that were never going to become customers. In 2026 the most important nuances are that negatives don’t match close variants (so you must add every variant yourself), that Performance Max can and should now be given negatives of its own, and that the search terms report — reviewed weekly — is where the whole system lives or dies. Build a solid list before you launch, grow it every week, and treat it as the other half of your match-type strategy, not an afterthought.

Not sure how much of your budget is leaking to searches you’d never choose? We’ll pull your actual search terms report and show you exactly where the waste is. Talk to us or see our Google Ads management.

FAQ

What is a negative keyword in Google Ads?
A negative keyword is a word or phrase you add to stop your ad from showing on searches that contain it. Where a normal keyword tells Google which searches you want, a negative keyword vetoes searches you don’t want — like “free,” “jobs” or “DIY” — so you stop paying for clicks that will never convert.

Do negative keywords match close variants like normal keywords?
No — and this is the most important thing to know. Positive keywords automatically match misspellings and plurals, but negative keywords do not. If you block “job” you have not blocked “jobs” or misspellings, so you must add every variant, plural and common misspelling yourself.

What’s the difference between negative broad, phrase and exact?
Negative broad blocks a search only when it contains all your negative terms, in any order. Negative phrase blocks searches containing the exact terms in the same order. Negative exact blocks only when the search is exactly your terms and nothing else. For intent words like “free” or “jobs,” negative broad or phrase is usually right.

Can I add negative keywords to Performance Max?
Yes. Since January 2025 you can add campaign-level negatives to Performance Max, and since March 2025 the limit is 10,000 per campaign, matching Search. Google also released a PMax search terms report in March 2025, so you can see which queries to block.

How many negative keywords can I have?
A shared negative keyword list holds up to 1,000 keywords, and a single campaign can hold up to 10,000 negatives — far more than a typical Singapore SME needs. Google also only checks negatives within the first 16 words of a search query.

How often should I update my negative keyword list?
Weekly while a campaign is new or high-spend, then fortnightly once the obvious junk is cleared. Review the search terms report each time and add any new irrelevant terms — and their variants — that appear.