Google Demand Gen Campaigns for Ecommerce: The 2026 Guide

In one line: Demand Gen is Google's mid-to-upper-funnel campaign type that took over from Discovery ads. It uses visual creative to create demand, rather than catching existing demand the way Search does. For ecommerce the split is clean — PMax and Search harvest people who are ready to buy, while Demand Gen plants the seed before they ever start searching.

Discovery ads were fully replaced by Demand Gen back in 2024. By 2026, Demand Gen has picked up product feeds, lookalike audiences, built-in A/B creative experiments and more granular bidding (all of which you should verify in your own Google Ads account, 2026). This post helps you decide when to run Demand Gen, how to pair creative with audiences, and how it divides labor with PMax vs Search.

Where Demand Gen actually runs

Demand Gen serves on Google's most discovery-oriented surfaces: YouTube (including Shorts and the feed), the Discover feed, and Gmail, and in some cases the Google Display Network too (confirm exact coverage in the 2026 UI). This is the opposite logic of Search — Search is someone actively typing to find you, while Demand Gen puts your products in front of people while they scroll video and Discover.

That makes Demand Gen the closest thing inside Google to a social-style feed ad. If you already run visual prospecting on Meta or TikTok, the mental model transfers cleanly: you pull demand with creative and audiences, rather than catching it with keywords.

Creative: this is what makes or breaks Demand Gen

Demand Gen runs on creative the same way Search runs on keywords. The main formats it supports (verify in the 2026 UI):

• Single image / portrait — good for Discover and Gmail placements.
• Carousel — ecommerce uses this to show several best-sellers or a whole collection users can swipe.
• Video — especially vertical short-form, which taps YouTube Shorts. This is a capability Discovery ads never had.
• Product-feed-driven dynamic ads — connect your Merchant Center feed and the system assembles product images plus pricing automatically.

Practical tip: feed multiple formats and several videos into each ad group and let the system test. Google's own data (May–June 2026 window) claims advertisers with large product catalogs see roughly a 33% conversion lift after adding product feeds to Demand Gen — treat that as a directional signal, not a promise, and verify in your own account.

Audiences: lookalikes plus your own data

Demand Gen's audience toolkit is noticeably stronger than old Discovery. You can use:

• Lookalike / similar audiences — build a seed from your high-value buyers (repeat customers, high-AOV customers) and let Google find people like them. This is the workhorse for ecommerce prospecting.
• Custom / interest audiences — target by search behavior, interests, and purchase intent.
• First-party data (customer lists, remarketing lists) — upload or connect for remarketing and lookalike seeds.

On bidding, Demand Gen in 2026 supports both conversion-based bidding and value-based bidding (tROAS / Maximize Conversion Value). For ecommerce, go with value-based bidding to chase revenue rather than optimizing for raw conversion count — again, confirm the options available in your account.

Demand Gen vs Discovery vs PMax: a table

(Placement and format details vary — verify in your Google Ads account, 2026.)

When ecommerce should use Demand Gen vs PMax / Search

Treat all three as one combination, not a three-way pick:

• Search = the cash cow. Catch existing intent first — it is your most reliable conversion.
• PMax = the scale engine. Once conversion tracking, conversion values and product feeds are solid, use it to harvest across every channel. See the PMax ecommerce guide.
• Demand Gen = the prospecting layer. Use it when you need incremental visual reach, want to create demand before people search, or need more control over creative and audiences.

A common ecommerce starting point: established brands put 70–80% into PMax and 20–30% into Demand Gen for prospecting; new brands or product launches invert that, leaning into Demand Gen to build awareness and using PMax to catch early intent (tune the ratio to your data and margins). For the PMax-vs-Search split, start with PMax vs Search; to run the YouTube lane well, see YouTube ads for ecommerce; for the full picture, read the complete Google ads for ecommerce guide.

Frequently asked

Is Demand Gen the same thing as Discovery ads?

No. Demand Gen is the successor to Discovery ads and fully replaced them in 2024. Demand Gen added video (including Shorts), carousels, lookalike audiences and built-in creative experiments — it is a stronger upgrade, not just a rename.

Should ecommerce use Demand Gen instead of PMax?

Usually not. They do different jobs: PMax leans toward full-funnel harvesting and scale, while Demand Gen sits mid-to-upper funnel to create demand. Most ecommerce brands run both — PMax to harvest, Demand Gen to prospect — rather than choosing one.

Can Demand Gen use a product feed?

Yes. In 2026 Demand Gen supports connecting your Merchant Center product feed to generate dynamic ads with product images and pricing. Ecommerce with larger catalogs especially should connect it — confirm the capability is enabled on your account.

What bidding should Demand Gen use?

For ecommerce, use value-based bidding (Maximize Conversion Value or tROAS) to chase revenue rather than only optimizing conversion count. Conversion-based bidding is also supported. Confirm the exact options in your Google Ads account, 2026.

How much budget does Demand Gen need to work?

It is a learning system, so a budget that is too small keeps it stuck in the learning phase. Give it enough daily budget and a relatively loose target to gather data, then tighten gradually. What counts as enough depends on your average order value and conversion value — validate small before scaling.