Smart Bidding Exploration
An opt-in Google Ads feature that directs the bidding algorithm to pursue queries it would normally skip — signals within your eligible set that previously fell below its confidence threshold — by accepting a bounded ROAS reduction in exchange for reaching new converting users.
A Search campaign at its keyword ceiling keeps spending without growing. The algorithm bids on queries it has confidence in and skips the rest. Smart Bidding Exploration offers the algorithm ROAS flexibility in exchange for bidding on those skipped queries.
You enable it in your campaign’s bidding settings and set a tolerance for how far your ROAS can dip during exploration. At 10% tolerance on a 500% tROAS target, the algorithm can bid as if the target were 450% when pursuing less-certain queries. It does not add new keywords or expand match types.
How it shows up in the wild
Google Ads at Google Marketing Live 2025 (Search campaign launch, May 2025): 18% more unique search query categories with conversions and 19% more total conversions across campaigns running the feature at launch, per Google’s official announcement. The feature launched exclusively for Search campaigns running Target ROAS. It did not expand keyword reach; it directed the algorithm to bid on queries within the existing eligible set that it had historically passed over as too uncertain to win.
Google at Google Marketing Live 2026 (expansion to Performance Max and Shopping, June 2026): Search campaigns running Smart Bidding Exploration averaged 27% more unique converting users at the time of the 2026 rollout, per Google’s GML 2026 announcement. The feature became globally available for Performance Max campaigns without product feeds on June 15, 2026, with feed-driven Shopping following in beta. For ecommerce brands, the Shopping beta marked the first time Smart Bidding Exploration applied to feed-driven inventory — typically the highest-conversion-volume campaign type for a product-based advertiser.
Why it matters
Smart Bidding Exploration is gated behind Target ROAS, which means it assumes a working bidding foundation before exploration starts. My hunch is that accounts generating fewer than 50 purchase conversions per month will find the exploration signal too thin to surface meaningful new query categories — the algorithm needs enough conversion history to distinguish genuinely overlooked opportunities from low-quality traffic.
The ROAS tolerance you set determines how aggressively the algorithm explores. Google recommends running the feature for at least 6 weeks before evaluating results. Cutting the window short ends the learning period before signal has accumulated.
Related terms
- Smart Bidding — the parent bidding framework Smart Bidding Exploration extends
- Performance Max — the campaign type Smart Bidding Exploration expanded to in 2026
- ROAS (Return on Ad Spend) — the target metric that defines the exploration threshold
- AI Max for Search — a related AI-powered Search feature that pairs with Smart Bidding Exploration
- Search Intent — the signal Smart Bidding Exploration reads when selecting which queries to pursue
Frequently asked questions
Does Smart Bidding Exploration expand my keyword targeting? No. It does not add keywords or change match types. It redirects the algorithm to bid on queries already within your eligible set that it has historically skipped due to low conversion confidence.
Will my ROAS drop when I turn it on? Yes, in the short term. The algorithm accepts a lower return on individual auctions during the exploration phase. How far it drops depends on the tolerance you set and how much unexplored territory exists in your query space.
Which campaigns are eligible as of June 2026? Search campaigns running Target ROAS (original eligibility), Performance Max campaigns without product feeds (globally available), and Shopping campaigns including Performance Max with product feeds (in beta).
How is this different from simply lowering my tROAS target? Lowering your tROAS target increases the bid ceiling for all auctions uniformly — you pay more for traffic you were already winning. Smart Bidding Exploration directs the algorithm specifically toward queries it has not been bidding on. The spend behavior differs: one raises bids on known traffic, the other pursues new traffic at a defined cost tolerance.