Google Demand Gen: ROI Optimization for 2026

The ad world is getting a shakeup. By October 2026, Google’s phased rollout of Demand Gen campaigns will redefine how we all get ROI optimization. This move absorbs old campaign types like Performance Max (PMax) and Discovery, creating some real challenges but also huge opportunities for anyone who’s ready to adapt. If you want to keep your ad performance up, or even improve it, you need to understand how Demand Gen works and follow a precise plan.

Setting Up Your First Demand Gen Campaign

Making the switch to Demand Gen campaigns isn’t a choice. It’s the direction Google’s audience-centric advertising is headed for good. This means you can’t just keep doing what you’ve been doing with older campaign types.

Accessing Demand Gen in Google Ads

First things first, get into your Google Ads account.

1. Look at the left-hand navigation panel and click Campaigns.
2. Hit the blue + New Campaign button.
3. It’ll ask for an objective. Pick Sales, Leads, or Website traffic. If ROI is your main concern, you should almost always be choosing Leads or Sales.
4. In the “Select a campaign type” section, you’ll see Demand Gen. That’s the one. You might see the old campaign types there for now, but ignore them if you want to build for the future.
5. Click Continue.

Pro Tip: Google’s interface is always changing. By 2026, Demand Gen is front and center. If you’re not seeing it, your account might need an update, or you should check Google’s own support docs to see if it’s still rolling out in your region.

Common Mistake: I see a lot of advertisers try to just copy-paste their old Discovery or PMax setup into a new Demand Gen campaign. That completely misses the point. This campaign type is built for a totally different kind of audience interaction that requires you to rethink your creative and audience strategy from the ground up.

Defining Campaign Goals and Conversion Actions

Once you’ve selected Demand Gen, you have to tell it what your goals are. This isn’t just a box-ticking exercise. It’s how you train the machine learning algorithm.

1. On the “Select conversion goals for this campaign” page, look at what Google has pre-selected from your account settings.
2. This is important: turn off any conversion actions that aren’t your main ROI driver. For example, if you’re chasing qualified leads, make sure “Form Submissions” is on, but turn off something vague like “Page Views.”
3. You can change these by clicking Add goal or the Remove button next to the ones you don’t want.
4. When you’re happy, click Continue.

Expected Outcome: You’ll have a campaign structure that’s perfectly aligned with what your business actually needs, which gives the algorithm clean, clear signals on what a good conversion looks like. This level of precision is the foundation for solid ROI optimization.

Building Your Audience Strategy for Demand Gen

Audience targeting in Demand Gen is everything. It’s far more granular than in the old campaign types, and it’s where you decide who sees your ads and how fast you burn through your budget.

Using Custom Segments and Lookalikes

Demand Gen runs on good audience data, which is why your first-party data is so valuable now.

1. In the “Audiences” step, click + New Audience.
2. Give it a name you’ll remember.
3. Under “Your data segments,” use Customer Match to upload your existing customer lists. A Statista report from early 2026 showed that campaigns using Customer Match saw an average ROI bump of 15% just from the better targeting.
4. Select your uploaded lists and then click Add segment.
5. Now, dive into Custom segments. Don’t just throw in broad keywords. Define segments based on specific actions like “People who searched for any of these terms on Google” or “People who visited these types of websites.” Get specific. If you’re a B2B SaaS company, use terms like “cloud migration solutions” or the URLs of your direct competitors.
6. To find new customers, build Lookalike segments from your best Customer Match lists. Google’s algorithm will then hunt for people who behave like your highest-value customers.

Pro Tip: Don’t just lean on Google’s “Optimized Targeting.” It’s fine for expanding reach later, but your real ROI drivers are well-defined custom segments and your Customer Match lists. I consistently see better performance from advertisers who put in the work here.

Common Mistake: Throwing too many overlapping audience segments into the mix without any real difference between them. This just confuses the algorithm and muddies your targeting. Start with a few distinct segments and only expand after you have some data.

Integrating In-Market and Affinity Audiences

Beyond your own data, Google’s network has some powerful behavioral targeting options you should be using.

1. In the same “Audiences” section, go to In-market and life events.
2. Look through the categories that make sense for your product. Selling home decor? The “Home & Garden > Furniture” in-market audience is a no-brainer.
3. Check out Affinity segments for wider, interest-based targeting. They’re good for building brand awareness while you’re also pushing for direct sales.
4. Layer these segments together. For instance, combining an in-market segment for “Business Software” with a custom segment of people who visited competitor websites is a really potent mix.

Expected Outcome: You’ll have a layered audience strategy that uses the accuracy of your own data and the scale of Google’s behavioral data. This ensures your ads are hitting the people who are actually likely to buy.

Crafting High-Performing Creative Assets

Demand Gen is all about visuals. It relies on engaging creative to grab someone’s attention in their YouTube, Gmail, and Discover feeds. Your old, generic stuff just isn’t going to perform.

Developing Diverse Ad Formats

You need to give the algorithm a lot of different assets to play with.

1. On the “Ads” step, click + New Ad.
2. Demand Gen uses several formats, and you should provide assets for all of them:
   • Image Ads: Upload clean, high-resolution images. You’ll need field (1.91:1), square (1:1), and portrait (4:5) versions. Have at least 5-10 completely different images ready to go.
   • Video Ads: These are huge for engagement. Get some short-form videos (think 15-30 seconds) that feel native to platforms like YouTube Shorts. A recent IAB report showed that these short videos in Demand Gen get a 25% higher click-through rate than static images for top-of-funnel goals.
   • Carousel Ads: These are great for e-commerce or for showing off different product features. You can use 2-10 cards, and each one gets its own image, headline, and link.
3. Write multiple headlines (both short and long), descriptions, and calls to action. The more options you give the system, the faster it can figure out what works.
4. Make sure your landing pages are directly related to the ad copy. Don’t send someone to a generic homepage.

Pro Tip: Test your creative constantly. What kills it with one audience might be a complete dud with another. I always tell my clients to set aside 20% of their starting budget just for creative testing. A simple A/B test between a product-focused video and a problem-solution video can give you some shocking insights.

Common Mistake: Reusing old creative from other campaigns without changing it for Demand Gen’s visual-first feeds. A static banner ad that worked okay in a classic display campaign almost always looks out of place and performs poorly here.

Writing Compelling Ad Copy

Even with great visuals, the words still have to do the heavy lifting.

1. Write at least 5 different Short Headlines (up to 30 characters). Make them punchy and focused on value.
2. Write at least 3 Long Headlines (up to 90 characters). Use this space to add more context or explain a key benefit.
3. Come up with 2-3 solid Descriptions (up to 90 characters). This is your chance to talk about unique selling points or hit on customer pain points.
4. Pick a clear Call to Action (like “Shop Now,” “Learn More,” “Get a Quote”). Google gives you a list to choose from, so pick the one that matches your conversion goal.

Expected Outcome: You end up with a big library of creative pieces. Google’s AI then mixes and matches these assets to serve the best possible ad to different people, which maximizes engagement and your chance of conversion. The system learns what works and your ROI gets better over time.

Budgeting and Bidding Strategies for ROI Optimization

Budgeting in Demand Gen isn’t set-it-and-forget-it. It needs a hands-on approach, particularly in the beginning. Your goal is to feed the algorithm enough data to learn without just burning cash on stuff that isn’t working.

Implementing Smart Bidding with Conversion Value

Demand Gen campaigns are built to run on Smart Bidding.

1. In the “Bidding” section, pick your bidding strategy. If you care about ROI, Maximize Conversion Value is almost always the right choice.
2. If your conversions have different values (like different product prices), you absolutely must have conversion value tracking set up correctly in Google Ads. This is how you tell the algorithm what a conversion is actually worth to your business.
3. You can add a Target ROAS (Return On Ad Spend) if you have enough data (the rule of thumb is at least 50 conversions in the last 30 days). This lets you tell the system exactly what ROAS you’re aiming for.

Pro Tip: Don’t set your Target ROAS too high right out of the gate. You’ll starve the campaign before it even has a chance to learn. A common error is plugging in a 400% ROAS target on day one and then wondering why there are no impressions. Start with something realistic, maybe 200%, and then walk it up as performance gets better.

Common Mistake: Using “Maximize Conversions” but not tracking conversion values. This tells the algorithm to get you the most conversions possible, regardless of their quality, which often leads to a lot of low-value actions that kill your actual ROI.

Monitoring and Adjusting Budgets

These campaigns can take off and spend money fast, so you have to watch your budget like a hawk.

1. Once you launch, check your campaign performance every day for the first week, and then every couple of days after that.
2. Keep a close eye on your Conversion Value / Cost (which is your ROAS) and your Cost / Conversion (your CPA).
3. If you see a specific audience segment or creative that’s just tanking, pause it or change its targeting. Don’t let it keep spending.
4. You should also set up Automated Rules (you can find them under Tools and Settings > Rules). These can automatically pause ads or change bids for you. For example, you can create a rule to pause any ad group that spends $50 without getting a single conversion.

Expected Outcome: You’ll have a campaign that’s smart about where it puts your money, shifting budget to the best-performing combinations of audiences and creative. This constant cycle of monitoring and adjusting is what leads to long-term success and a good return on your spend.

Advanced Optimization Techniques for Demand Gen

Once your campaigns are up and running consistently, you can start fine-tuning to squeeze every last bit of ROI out of them.

Using Exclusion Lists and Negative Keywords

Demand Gen is audience-focused, but you still have some control over where your ads show up, even if it’s broader than in a Search campaign.

1. Go to Settings > Brand Safety to upload Content Exclusions. Here, you can block sensitive content categories or specific placements you don’t want to be associated with.
2. For YouTube, go to Placements > Exclusions. You can exclude specific channels or even individual videos that are off-brand or irrelevant.
3. While there isn’t a direct negative keyword list like in Search, you can effectively create negative targeting by refining your custom segments. For example, if you sell high-end luxury goods, you might want to exclude affinity segments related to “budget shopping” or “discount stores.”

Pro Tip: Check your placement reports regularly (they’re under Where Ads Showed in the campaign view). If you see you’re consistently spending money on weird YouTube channels or irrelevant websites, add them to your exclusion list immediately. This stops wasted ad spend and instantly improves your ROI.

A/B Testing and Experimentation

You have to keep testing. It’s the only way to get sustainable ROI over the long term.

1. Use the built-in Experiments feature in Google Ads (it’s in the left-hand menu under Experiments).
2. You can create a draft of your campaign and then run an experiment to test one thing at a time, a different bidding strategy, a new batch of creative, or a tweaked audience segment, against your original setup.
3. Let experiments run for at least 4-6 weeks. You need that much time to get data that’s actually statistically significant. What’s the point of testing otherwise?

Expected Outcome: Your campaign will always be getting better because you’re making decisions based on real data, not just guessing. The goal isn’t just to launch a campaign. It’s to constantly evolve it based on what’s actually working.

The October 2026 ad platform shift is a fundamental evolution of Google’s entire advertising system. By setting up Demand Gen campaigns correctly, focusing on strong audience signals, and committing to constant creative and budget optimization, advertisers can not only survive this change but actually achieve better ROI. You’re adapting to an advertising environment that’s increasingly focused on the audience. To really get ahead, understanding how AI agents reshape marketing analytics will be a critical skill in 2026.