Big changes are hitting Google Ads today (August 17): expansion of Smart Bidding Exploration to chase more incremental demand and changing how target-based bidding behaves when campaigns are limited by budget. Earlier this summer, Google also launched a Promotion Mode beta for short-term demand spikes,
The common theme is that Google is handing its algorithm more room to make spending decisions on your behalf. For advertisers, our job is now much less about managing bids and much more about managing the guardrails you give the system.
Google has added Promotion Mode, expanded Smart Bidding Exploration, and changed target-based bidding for budget-limited campaigns. All three give the algorithm more decision-making room.
There's real upside here (more volume, faster response to demand shifts), but only if your conversion data, efficiency targets, and scale-versus-efficiency limits are clearly defined and you’re using enhanced conversions and offline conversion tracking to integrate your first-party data into the bidding algorithms.
Identify which campaigns are budget-limited and on target-based bidding now. Those are the ones to watch as the changes take root.
Set a clean CPA, ROAS, spend, and conversion baseline before the change so you have something concrete to compare against.
Treat Smart Bidding Exploration and Promotion Mode as tests, not defaults. Use Promotion Mode as a temporary lever for anticipated demand spikes, not a permanent loosening of efficiency.
Each of these updates points in the same direction: Google wants its bidding system to make more of the calls. Smart Bidding Exploration gets more license to pursue demand it thinks is out there. Promotion Mode lets you tell Google you expect a demand spike and you're comfortable being more aggressive. Target-based bidding shifts how it balances efficiency against budget when a campaign is capped.
I'm not skeptical of the updates; the upside is genuine. Handing the algorithm more room can help you find volume you would have missed and respond faster when demand moves, without you sitting in the account making manual adjustments every week. What I'm skeptical of is the assumption that added scale is automatically a win.
Profitable, incremental spend is always the goal. If Google is capturing demand we never would have reached on our own, that's exactly what we want. The moment the added scale stops aligning with the efficiency and business outcomes we actually care about, "more volume" becomes a liability. That’s why the real work now sits in the Smart Bidding guardrails: strong conversion data, realistic efficiency targets, and a clear line on how much efficiency you're willing to trade for scale. Those inputs mattered before, and they’re absolutely critical now that the system has more freedom to act on them.
Of the changes, the target-based bidding update has the clearest near-term operational consequence, and it doesn't touch every account equally. It hits campaigns that are limited by budget and using target-based bidding. Those are the campaigns I'd want eyes on immediately.
The prep work is straightforward, and none of it requires touching settings across every account. Start by pulling a list of which campaigns are actually budget-constrained and on target-based bidding today. That list is your watch list.
Establish a clear baseline from pre-change data. Record CPA or ROAS, spend, and conversion volume so you have something concrete to compare against afterward. For example, a budget-limited nonbrand lead-gen Search campaign might spend about $250 per day, generate 45–55 qualified conversions per month, and typically land within a $140–$165 CPA range. That range—not any single day’s result—becomes the campaign’s working baseline. These figures are illustrative, not universal benchmarks or guaranteed outcomes. Without a baseline, you'll be guessing about whether any movement after Aug. 17 is the change doing its job or normal fluctuation.
When I talk to clients about this, I'm not telling them to brace for chaos. I'm framing it as a shift in how much flexibility Google's bidding has to go after demand and, for some campaigns, how it balances efficiency targets against budget limits. For the budget-limited campaigns specifically, we may see movement in spend, CPA, or ROAS as the system adjusts. Movement isn't automatically good or bad. What I care about is whether performance gets more consistent over time and whether any incremental spend is driving incremental business value.
Promotion Mode has the clearest immediate value to me. Performance already behaves differently during promotions, holidays, launches, and other short windows where demand spikes. Advertisers usually end up making a pile of manual budget and bidding adjustments around those moments, and the timing is easy to get wrong.
Being able to tell Google, in effect, "demand is going to look different for this period and we're comfortable being more aggressive," takes a lot of the manual scrambling out of those windows. The part I like most is that it's built to be temporary. You're not permanently loosening your efficiency goals because you wanted more volume for a few days. You turn it on for the spike, then you turn it off.
That temporary design is exactly how it should be used. Promotion Mode earns its place when you have a known, predictable demand event on the calendar. It does not earn a place as a quiet, always-on setting that stretches your efficiency targets year-round. Use it for the sale, the launch, the holiday, and then let the campaign return to its normal targets.
The theme running under all of this is incrementality. Smart Bidding Exploration and Promotion Mode both invite you to let the system spend more in pursuit of more demand. Before you trust that scale, you need proof it's incremental and profitable rather than just bigger.
I'd treat Smart Bidding Exploration and Promotion Mode as tests, not defaults. Roll either one out only where there's a clear use case and enough quality conversion data to support it. Accounts with thin conversion data or no near-term promotional event have no reason to rush into these. Feeding a hungrier algorithm weak signal is how you get more spend without more results.
This matters most for two groups: First, campaigns already limited by budget and running target-based bidding, because the Aug. 17 change touches them directly; second, advertisers with predictable short-term demand spikes, where Promotion Mode has an obvious job to do.
It matters less for accounts with thin conversion data and no promotional events on the horizon. This is not a reason to make sweeping changes across every account this week. The advertisers who benefit are the ones who match the right change to the right campaign, backed by data clean enough to trust.
With the new features, Google has shifted more decision-making into the bidding system, and the responsibility that used to live in manual bid management now lives in the guardrails you set and the baseline you measure against. Identify your exposed campaigns, set your baseline, treat exploration and Promotion Mode as deliberate tests, and hold every bit of added scale to the same standard: incremental and profitable. Don't overreact to the first few days of data unless something moves materially outside the range you'd normally expect. Consistency over time is the signal that counts.
If you're trying to figure out which campaigns are exposed to Google's Aug. 17 bidding change or whether Promotion Mode is worth testing for your next big sales moment, let's talk it through.
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Google is changing how target-based bidding balances efficiency targets against budget when a campaign is limited by budget. For campaigns that are already budget-constrained and using target-based bidding, you may see movement in spend, CPA, or ROAS as the system adjusts. Set a clean baseline for those metrics from before Aug. 17 so you can tell whether any movement is the change working or normal fluctuation.
Promotion Mode lets you signal to Google that you expect a short-term demand spike (a sale, launch, or holiday) and that you're comfortable being more aggressive during that window. Its value is that it replaces the manual budget and bidding adjustments advertisers usually make around those events, and it's designed to be temporary. Use it as a lever for known, predictable demand events, not as a permanent loosening of your efficiency goals.
No. Treat Smart Bidding Exploration as a test and roll it out only where there's a clear use case and enough quality conversion data to support it. Accounts with thin conversion data or no near-term demand shift have little reason to rush in, since giving a hungrier algorithm weak signal tends to produce more spend without more incremental results.
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