What Is Google Ads AI Max and How Does It Work For Advertisers?

Google Ads AI Max is not a separate campaign type. It is a bundle of controls inside an existing Search campaign. Those controls cover broader search-term matching, ad text written for the query, and the option to send the click to a different page on your site. Turned on carelessly, it spends. Turned on with limits, it finds searches your keyword list missed.

This post has been updated. It now covers how those controls behave, including the September migration that switched some campaigns on without a fresh opt-in.

What the three switches do

Search term matching is on by default once AI Max is on. You can turn it off at the ad group. It uses broad match plus signals from your ads, assets, and landing pages to enter auctions your exact keywords would skip. That is useful for a service business whose customers describe the job in a dozen ways. It is expensive when the ad group mixes two different offers.

Text customization, previously called automatically created assets, writes extra headlines and descriptions from your existing ads and the landing page. It is a campaign-level switch. You can remove individual generated lines. In October 2026 Google also started showing sample headlines from a final URL before you commit the switch, which is the right moment to catch a promise your page does not make.

Final URL expansion sends the click to another relevant URL on the same site when Google expects that page to convert better. It should stay inside the theme of the ad group. If your site has thin or outdated service pages, expansion will find them. Fix the pages, or leave expansion off until you do.

What changed in 2026

In April 2026 Google added AI Brief, a plain-language place to tell the system what the business is, who it serves, and what ads must or must not say. “Never mention a price” and “we only serve the Philadelphia suburbs” belong there. So does the difference between an install and a repair if those are separate offers.

The same update pointed AI Max at Shopping and travel formats. Most local service accounts will not use those. The Search controls are the part that changes a contractor or professional-services account.

Through September 2026, Search campaigns that already used campaign-level broad match, or automatically created assets, were moved into AI Max. Broad-match campaigns came over with search term matching on and the other two switches off. Campaigns that already let Google write assets came over with matching and text customization on, and final URL expansion off. Migrated campaigns can still be switched off. Check the campaigns you did not touch in August.

Google has said the full suite averages about 7% more conversions or conversion value at a similar cost per conversion for non-retail advertisers. Treat that as their aggregate claim, not a forecast for your account. Accounts with messy conversion tracking will not see a clean version of that number.

When AI Max is worth it

• The campaign has one offer and one geography, not a grab bag of services.
• Conversion tracking records leads you would actually pay for, including calls if the phone is the sale.
• You have enough conversion history for Smart Bidding to learn. A brand-new site with no leads yet is a weak place to start. See whether to run ads on a brand-new website.
• Search terms from the last 30 days are mostly the jobs you want. If they are not, fix negatives before you widen matching.

Guardrails that matter more than the toggle

Negatives still apply. Brand exclusions and location settings still apply. AI Max does not repeal them. Add negatives for the jobs you do not sell, the cities you do not serve, and the bargain queries that only produce price shoppers.

Keep ad groups narrow enough that a generated headline cannot be true for one keyword and false for another. “Same-day repair” and “full replacement” should not share an ad group if the landing pages and prices differ.

Read the search-term report every week for the first month, then at least monthly. The point of the extra reach is the queries you were not targeting. Those are also the queries most likely to be wrong.

How to tell if it is working

Compare the period after the change to the period before it on conversions and cost per conversion, not on clicks. A jump in impressions with a worse lead cost is the system buying curiosity. Give a learning campaign a couple of weeks, not two days, and do not change bids, ads, and landing pages on the same day you judge it.

If text customization is on, spot-check the combinations report for lines you would not say out loud to a customer. Remove those. If final URL expansion is on, look at which URLs received the clicks and whether those pages have a form or a phone number above the fold.

AI Max is a reach tool with a creative tool attached. The accounts that benefit already know which leads are worth paying for. If you want that review done against a live account, Prager’s Google Ads management starts with the search terms and the tracking, not with the new toggle.