Smart Bidding Exploration: What the PMax and Shopping Expansion Means

Contents

Summary

Smart Bidding Exploration expanded at Google Marketing Live 2026. It now covers Search and Performance Max campaigns without product feeds, with Shopping (and PMax with feeds) rolling out via beta. Google’s own data shows +27% more unique converting users on Search campaigns that use it. The catch is that it works by relaxing your effective ROAS target to reach new users, which means short-term efficiency dips before incremental volume builds. Worth it for volume-hungry accounts in growth mode. Probably not worth it if you’re managing to a tight ROAS or running on thin margins.

Zara Imrie, Google Ads & AI Marketing Specialist, Founder of Bizi Digital

This post was drafted with AI assistance and reviewed by Zara Imrie.

What was announced at GML 2026 {#what-was-announced}

Smart Bidding Exploration has been quietly available on Search for a while. At Google Marketing Live 2026, Google confirmed the expansion, and since then it has reached general availability for Search and Performance Max campaigns without product feeds, with Shopping still in beta.

Search and Performance Max campaigns without product feeds now have it in general availability, globally and in all languages. Shopping (and PMax with feeds) is still in beta, and you can sign up for early access directly.

The headline number Google is leading with is +27% more unique converting users on Search campaigns that use it. That’s from Google’s own internal data, January to February 2026, global, Search text ads only. It’s a real number. It will be everywhere by the end of the week.

But it doesn’t tell you the full story.

How Smart Bidding Exploration actually works {#how-it-works}

The name is a bit misleading. It’s not exploring new audiences or new targeting settings.

What it actually does is widen the range of search categories your campaigns bid into, within your existing targeting. Your targeting stays the same. The AI just bids on a broader set of search queries that map to your existing categories, ones it would normally skip because they sit outside the core converting pattern it’s learnt.

Think of it as loosening the filter on which searches get a bid. Some of those searches won’t convert at your usual rate. That’s the point. You’re reaching users who wouldn’t have seen your ad otherwise.

Scale up conversion volume. Find new converting users Google Ads wouldn’t normally reach. That’s the play.

See the full picture of what Google announced last week in our Google Marketing Live 2026 roundup.

The ROAS trade-off nobody is talking about {#the-roas-trade-off}

Here’s the bit that gets buried under the +27% stat.

Smart Bidding Exploration works by relaxing your effective ROAS target. It has to. If the AI only bids where it’s confident of hitting your target ROAS, it stays in a narrow lane. To reach those extra unique converting users, it needs room to bid on queries where the conversion probability is lower.

So in the short term, your ROAS drops.

Not dramatically, not off a cliff, but it drops. The system is doing exactly what it’s designed to do: accepting lower efficiency on individual auctions to increase overall volume.

I’ve had clients ring me up frustrated because they turned on a Google feature, did nothing else, and their ROAS went soft for a fortnight. Every time, it’s been the system exploring. Every time, we’ve waited, watched the conversion volume data, and seen whether the new users actually stuck.

Sometimes they do. Sometimes the incremental volume is real and the ROAS recovers as the system learns which of those wider queries are worth keeping. Sometimes it doesn’t recover cleanly, and you’re left with more conversions at worse efficiency, which is only a win if you’re margin-positive at that lower ROAS.

That’s why the single stat doesn’t close the argument. More unique converting users is good. More unique converting users at a ROAS that breaks your margin isn’t.

When to turn it on, and when to leave it off {#when-to-use-it}

Turn it on if you’re in growth mode and you have room in your ROAS. Specifically:

Your target ROAS has a buffer above your break-even ROAS. If your break-even is 300% and you’re targeting 500%, you have 200 points of room to absorb the exploration dip. If your target is already tight against break-even, you don’t.

You’re trying to grow conversion volume, not just improve efficiency. Smart Bidding Exploration is a volume tool. If your account is running well and your goal is to squeeze more margin per conversion, this is the wrong lever.

Your campaign has enough conversion data to support it. If you’re below 50 conversions a month, the AI doesn’t have enough signal to explore intelligently. It’ll just make noise.

Leave it off if you’re managing tight margins, if a ROAS dip would cause a cash flow problem, or if your account is already at capacity for the budget you have. Also leave it off on Shopping campaigns until the beta has more data behind it.

If you’re running AI Max on Search, worth reading our AI Max for Search breakdown alongside this, as both features adjust how broadly Google serves your ads.

FAQ {#faq}

What is Smart Bidding Exploration in Google Ads?

Smart Bidding Exploration is a Google Ads feature that tells the AI to bid on a wider range of search queries within your existing targeting. It’s designed to find new converting users your campaigns wouldn’t normally reach. Google data from early 2026 shows Search campaigns using it see on average 27% more unique converting users.

Does Smart Bidding Exploration work for PMax campaigns?

As of June 2026, yes for Performance Max campaigns without product feeds, which are now in general availability alongside Search. PMax campaigns with product feeds, and standard Shopping, are still in beta, and you can sign up for early access.

Will Smart Bidding Exploration hurt my ROAS?

In the short term, yes, it can. The feature works by relaxing your effective ROAS target to bid on queries outside your core converting pattern. Efficiency often dips before incremental volume builds. If your target ROAS has room above your break-even, that’s manageable. If you’re running tight to your break-even, it’s a bigger risk.

How is Smart Bidding Exploration different from broad match?

Broad match expands which search terms trigger your keywords. Smart Bidding Exploration works differently. It keeps your existing targeting and adjusts where the AI chooses to bid, specifically by widening the search categories it pursues. Both affect reach, but through different mechanisms.

Should I enable Smart Bidding Exploration right now?

On Search, yes if you have ROAS headroom and want more volume. On PMax without a product feed, it is now available and worth testing on the same basis. On Shopping and feed-based PMax, it is still early beta, so I’d wait for more data unless you’re actively trying to grow and happy to test.

Next steps {#next-steps}

Want to know if Smart Bidding Exploration makes sense for your specific account? A Google Ads audit will look at your ROAS tolerance, conversion volume, and campaign structure and give you a straight answer. Or get in touch if you want to talk it through first.

Last updated: 21 May 2026

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