What's the Maximum Number of Cards in a Google Demand Gen Carousel Ad?

A Google Demand Gen carousel ad must contain a minimum of 2 and a maximum of 10 cards, according to Google's official Ads API reference documentation for the DemandGenCarouselAdInfo field. That 2-to-10 range is a hard technical limit enforced at the API level, not just a best-practice recommendation.

Where This Limit Comes From

Google's Ads API reference specifies the carousel cards field as required for this ad type, with the field explicitly bounded to between 2 and 10 cards. Because this comes from Google's developer-facing API documentation rather than a marketing blog, it reflects the actual validation Google applies when a carousel ad is created, whether through the Ads API, Google Ads scripts, or the standard Ads interface.

Each Card Carries Its Own Creative

Every card inside a Demand Gen carousel functions as its own mini-ad: its own image, its own headline, and its own destination URL, with all cards in a given carousel required to share the same dimensions. That structure means a 10-card carousel isn't just one creative repeated ten times — it's an opportunity to showcase ten distinct products, offers, or messages within a single ad unit.

How This Compares to Other Platforms

Demand Gen's 2-to-10 card range sits in the same general territory as several other major carousel ad formats across the industry, where a cap in the single digits to low double digits is the norm rather than the exception. Advertisers running the same campaign concept across multiple platforms should check each platform's specific carousel limit individually rather than assuming Demand Gen's range applies elsewhere, since caps and minimums vary by platform and ad format.

Practical Implications for Campaign Setup

Because the floor is 2 cards, not 1, a Demand Gen carousel can't function as a single-image ad dressed up in carousel format — advertisers need at least two genuinely distinct cards ready before the format becomes usable. On the upper end, hitting the 10-card maximum works best when there are enough genuinely different products or messages to fill each card meaningfully, rather than padding out slots with near-duplicate creative just to use the full allowance.

Where Demand Gen Fits in a Google Ads Account

Demand Gen is Google's visually driven ad format built for feed-like, entertainment-focused surfaces such as YouTube Shorts and Discover, which puts it closer in spirit to a social feed format than to traditional text-based Search ads. Carousel is one of several creative formats available inside a Demand Gen campaign, alongside single image and video assets, and advertisers choosing between those formats should weigh whether a 2-to-10-card sequential story actually serves the product or message better than a single strong image or short video would.

Checking the Limit Before You Build

Because this cap is enforced at the API and account level rather than being a stylistic recommendation, any workflow that generates carousel creative programmatically — through the Google Ads API, Google Ads scripts, or a bulk-upload process — should validate the card count against the 2-to-10 range before submission, rather than discovering the rejection after a batch upload fails.

Bottom Line

Plan Demand Gen carousel creative in the 2-to-10 card range from the start, since that span is enforced as a technical requirement by Google's API, not a flexible guideline that can be exceeded with the right settings.

Source: Google Ads API Reference, "DemandGenCarouselAdInfo" (developers.google.com/google-ads/api/reference/rpc/v20/DemandGenCarouselAdInfo).