Google Ads AI Max Search Terms and the Controls That Work

What AI Max actually does to your search terms

AI Max takes away the limit your keyword list used to set. With it switched on, Google can match your ads to any query it thinks fits your ads, your landing pages and your keywords. That includes queries no keyword of yours would have matched, even on broad.

AI Max is a setting on a standard Search campaign. It has three parts:

• Search term matching. Google matches queries using your keywords, your ad text and the content of your site. In practice this behaves like broad match plus Dynamic Search Ads at once. Your exact and phrase keywords stay in place, but they no longer mark the edge of what you can show for.
• Text customization. Google writes headline and description variations based on your site and the query.
• Final URL expansion. Google can send the click to a different page on your domain than the one you set, if it thinks that page fits the query better.

The first part is where waste comes from. Say a plumbing company bids on emergency plumber and burst pipe repair in exact and phrase. Before AI Max, the search terms report held close variants of those, like emergency plumbers near me and burst pipe repair cost. Close variants already stretched "exact". With AI Max on, the same report can also hold:

• water heater installation, a real service, but maybe one this company doesn't offer
• how to fix a leaking pipe under sink, someone who wants to do it themselves
• plumbing apprenticeship, a job seeker
• plumber salary, a job seeker who isn't ready to apply yet
• pipe fittings, someone looking for a hardware store

Google got to every one of these by reading the site. If your site has a blog post on fixing leaks or a careers page, AI Max sees content that matches those queries, and it doesn't know you never wanted that traffic. The site becomes the targeting. Every page you have published is now, in effect, a keyword.

This is the real change from a waste point of view. Keywords used to be the thing you controlled and negatives the thing you added later. With AI Max, negatives and exclusions become the main way you shape the campaign, and keywords become one hint among several.

How to find the search terms AI Max paid for

Open the search terms report for the campaign and look at the match type column. Google shows AI Max matches as their own type, "AI Max", not as broad, phrase or exact. Filter on it, sort by cost, and you have the list of queries your keywords alone wouldn't have bought.

Three things are worth checking in that filtered view.

Cost against conversions, by term. This is the obvious one. A term with $60 spent and no conversions over a few weeks is a candidate for blocking. One with $60 spent and two conversions isn't. If you need a method for this pass, how to analyze a search terms report in 20 minutes covers the order to work in.

The landing page column. If final URL expansion is on, the report shows which page each term was sent to. This is often where the cause of a bad match becomes clear. If plumbing apprenticeship landed on /careers, the careers page drew that query in. You can block the term, but you can also exclude the page, which stops every future query that page would attract.

The long tail. AI Max produces many terms that cost $2 or $4 each and never repeat in quite the same words. Each one looks too small to act on. Together they can be a real share of the campaign. Low-volume terms add up, and with AI Max there are a lot more of them.

There is a limit you should know about. The search terms report doesn't show every query. Google hides terms that too few people searched, for privacy reasons, and the cost of those clicks shows up in totals with no query attached. AI Max makes this worse because it matches more unusual, one-off queries, which are exactly the ones that get hidden. Hidden search terms and what to do about them goes into this. The short version: you can only block what you can see, so some AI Max spend will always stay out of reach of negatives.

For anyone pulling data through the API: AI Max terms come from Search campaigns, so they are reported in campaign_search_term_view along with the rest of Search, Shopping and Performance Max. No separate data source is needed.

Which controls actually limit AI Max

Four controls narrow what AI Max can buy. Negative keywords block specific queries. Brand exclusions block whole groups of brand searches. URL exclusions stop Google from matching on, or sending clicks to, pages you name. And you can switch search term matching off for an ad group. Other settings change how ads look, not which queries you pay for.

Negative keywords

Negatives apply to AI Max matches just as they apply to keyword matches. That includes campaign negatives, ad group negatives, and shared negative keyword lists. If salary is a broad negative on the campaign, AI Max can't buy plumber salary, whatever your careers page says.

What changes is how you choose match types for your negatives. Broad, phrase and exact are the three options, and each behaves a bit differently here:

• Exact negatives block only that query and its close variants. Against AI Max, which keeps finding new wording, they are the weakest choice. Block plumbing apprenticeship in exact and plumbing apprenticeship program can still get through.
• Phrase negatives block any query that contains the phrase in order. apprenticeship as a phrase negative covers every version of it. For job-seeker terms, DIY terms and competitor names, this is usually what you want.
• Broad negatives block queries containing all the words, in any order. They can be useful, but they behave unpredictably across match types. Before you add a two-word broad negative, check that it can't catch a search you want.

Generally, AI Max calls for shorter, broader-intent negatives than a tightly built exact-match campaign does. You are blocking ideas, not strings of words. Adding negatives from search terms without guessing explains how to pull the right word out of a bad term so one negative covers the whole family.

Brand exclusions and inclusions

AI Max lets you set brand exclusions, so the campaign won't match searches for brands you name. It also offers brand inclusions, which limit matching to searches tied to the brands you list. Brand exclusions are the clean way to keep a non-brand campaign from picking up your own brand searches, or to keep it off competitor searches when you don't want them. That's more reliable than keeping a long list of brand-name negatives, which miss misspellings.

URL exclusions

You can tell AI Max not to use certain pages on your site. This matters more than it seems. Because AI Max reads your site to decide what to match, excluding /blog/, /careers/ or /support/ removes the content that draws in DIY, job and existing-customer queries in the first place. One exclusion can do the work of dozens of negatives.

Turning off search term matching per ad group

You can keep AI Max on at the campaign level and switch off search term matching for specific ad groups. That's useful when one ad group is a tightly defined, high-cost service where any extra query is likely waste. Other ad groups can keep exploring.

What doesn't limit spend

Text customization and final URL expansion change the ad and the page, not which queries match. Turning text customization off won't reduce irrelevant queries. Turning final URL expansion off keeps clicks on the pages you chose, which can help conversion rate, but Google can still match the query based on your site. Location settings decide who sees the ad, not what they searched. And your bid strategy doesn't filter queries. As covered in how junk queries skew Smart Bidding, Smart Bidding learns from whatever traffic it gets, junk included.

Where negatives fall short with AI Max

Negatives still work with AI Max, but they react rather than prevent, and AI Max gives them more to react to. A list you build in week one will be out of date by week four, because AI Max keeps testing wording that no list has seen yet.

This is the uncomfortable part. With a keyword-led campaign, the set of possible queries is fixed by your keywords. Close variants and broad match stretch it, but there is an edge. With AI Max, the edge is your whole website plus whatever Google thinks is related to it. You can't list every bad query ahead of time. You can only see them after you've paid for at least one click, then block them.

A few things follow from that.

Some waste always comes first. Each new bad idea costs you a click or a few before it shows up in the report. A negative stops the second $8 click on pipe fittings wholesale, not the first. That's why how often you review matters more than how good your starting list is.

Starter lists help, but less than you'd expect. A good list of job, DIY and free-intent words, like the ones in negative keyword lists by industry, stops the obvious categories on day one. AI Max will still find adjacent services, wrong product types and informational queries that no generic list covers. Those are specific to your site.

Conflicts get more likely. The more broad and phrase negatives you add to hold AI Max back, the higher the chance one of them blocks a query you want. A phrase negative repair meant for phone repair traffic will also block burst pipe repair. Google doesn't warn you about this. Negative keyword conflicts Google Ads won't flag shows how to check.

You'll make mistakes, so keep them reversible. Blocking hard is the right instinct with AI Max, and some of those blocks will turn out wrong. Note what you added and when, so you can undo negative keywords quickly if conversions drop.

If you have run Dynamic Search Ads, none of this is new. AI Max's search term matching is close to DSA in how it uses your site, and the lessons from DSA negatives that actually hold carry straight over.

A review routine for the first 30 days

Check AI Max search terms every two to three days in the first month, then weekly once the bad patterns slow down. Each time, block by category rather than term by term, and exclude any page that keeps pulling in the wrong queries.

Here is what that looks like in numbers, using an illustrative campaign.

The plumbing campaign spends $3,000 in its first month with AI Max on. Filter the search terms report to the AI Max match type and you find $900 of that spend came from queries the keywords alone wouldn't have matched. Sorted by intent, the $900 breaks down like this:

$420 + $210 + $140 + $90 + $40 = $900.

So $420 of the AI Max spend found real customers your keywords had missed. That's the case for AI Max, and it's real. The other $480 found nobody. That's 16% of the whole $3,000 budget.

The fix for each group is different:

• Services not offered ($210): phrase negatives for water heater and septic. If the site has pages on these, say from an old service list, exclude those URLs too.
• DIY ($140): phrase negatives for how to, diy, yourself. Exclude /blog/ if the how-to articles live there.
• Job seekers ($90): phrase negatives for salary, apprenticeship, jobs, hiring. Exclude /careers/.
• Products ($40): phrase negatives for fittings, tool, supplies.
• Real services ($420): leave alone. Think about adding the best ones as keywords so they get their own ads and bids.

Done on day three instead of day thirty, most of that $480 is never spent. Done on day thirty, it's gone, and Smart Bidding has had a month of learning from it.

Two more points for the routine:

Don't judge single terms too early. A term with one $5 click and no conversion tells you little. Block on intent, not on one click. plumber salary is waste after one click because nobody looking up pay is booking a plumber. slab leak repair cost with one click and no conversion is just a term that hasn't converted yet. When to block search terms with no clicks covers the edge cases.

Watch the campaign-level number, not just terms. If AI Max spend keeps growing as a share of the campaign and cost per acquisition goes up with it, the expansion is costing more than it finds. CPA too high? Check search terms first shows how to tie the two together.

When to keep AI Max on, and when to switch it off

Keep AI Max on if, after a month of blocking, the AI Max match type is converting at a cost you'd accept from any other keyword. Switch it off, or narrow it to a few ad groups, if the useful queries it finds are few and the bad ones keep coming back in new forms.

Some accounts are a poor fit from the start:

• Sites with lots of non-sales content. Large blogs, help centres, careers sections and investor pages all give AI Max reasons to match the wrong people. URL exclusions help, but if half the site is content, you're fighting it all the time.
• Narrow, high-cost services. If a click costs $40 and you only sell one thing, every exploratory click is expensive. Search term matching off for those ad groups is often the right call.
• Accounts nobody reviews. AI Max works when someone reads the search terms often. In an account checked once a month, the waste runs for weeks before anyone sees it.

And some suit it: broad catalogues where customers describe the same thing in many ways, or accounts where exact and phrase keywords have hit their ceiling on volume and you want to find demand you haven't mapped yet.

Running AI Max next to Performance Max also means two campaigns built to expand reach can end up bidding on the same queries. If you run both, compare the terms each one buys before you decide which one should own them.

What PPCleaner does here, and what it doesn't

PPCleaner reads the search terms your AI Max campaigns paid for, judges which ones were never going to convert, and adds them as negative keywords every night. That covers the slow part of the routine above, the review every two or three days. Because AI Max terms sit in the same report as the rest of Search, they need no special handling.

It never blocks a term that converted in the last 90 days. So slab leak detection stays live once it has produced a customer, even when other terms in the same campaign are being blocked around it. Every block can be undone in one click for 90 days, which matters with AI Max, where you're blocking more widely than you would in an exact-match campaign.

What it doesn't do is just as important to know:

• It doesn't change AI Max settings. It won't add brand exclusions, set URL exclusions, or turn search term matching off for an ad group. Those are yours to decide. A URL exclusion on /careers/ is often a better fix than ten negatives, and only you can judge whether that page should be off-limits.
• It can't block hidden terms. If Google doesn't report a query, there is nothing to block.
• It doesn't prevent the first click. Like any negative, a block comes after the term has appeared in the report.
• It never touches budgets, bids, ads or keywords. If AI Max isn't paying off for a campaign, switching it off is still your call.

The fair way to put it: AI Max widens the net, and PPCleaner keeps throwing back what shouldn't be in it, every night. Deciding how wide the net should be is still up to you.