Google carousel ads let ecommerce brands show multiple products in one swipeable unit. They run across YouTube, Gmail, Discover, and the Google Display Network. This guide covers every spec, copy rule, and setup step you need.
What Are Google Carousel Ads?
Carousel ads pack 2 to 10 product images into a single swipeable format. Each card can carry its own headline, making them ideal for showcasing a product range or walking shoppers through a visual story.
Carousel ads vs. single-image ads
Single-image ads show one product and one message. Carousel ads give you multiple shots at a click. Each card adds context or highlights a different item. More cards means more chances to match what a shopper is looking for.
How carousel ads appear across Google feeds
Carousel ads are created inside Demand Gen campaigns. They appear across YouTube, Gmail, Discover, and the Google Display Network. That is substantial reach from one creative format.
Why carousels work for ecommerce
More products per impression creates more entry points for interest. A shopper who scrolls past card one might stop at card three. Carousels multiply your chances without multiplying your budget.
Google Carousel Ad Specifications and Image Requirements
Per Google's Ads Help Center, carousel ads support three aspect ratios. Every card in a single carousel must share the same ratio. Mixing ratios within one carousel is not allowed.
Supported image aspect ratios
- Horizontal. 1.91:1
- Square. 1:1
- Vertical. 4:5
Recommended dimensions for each format
| Format | Recommended | Minimum |
|---|---|---|
| Horizontal 1.91:1 | 1200x628 px | 600x314 px |
| Square 1:1 | 1200x1200 px | 300x300 px |
| Vertical 4:5 | 960x1200 px | 480x600 px |
Build to the recommended dimensions. Minimum sizes are permitted but they degrade visual quality at larger placements.
File size and format requirements
Each image has a 5MB file size cap. Accepted formats are JPG and PNG only. No GIFs, no WebP, no SVG.
Number of images per carousel
You can include 2 to 10 images per carousel ad. Two is the floor. Start with at least four cards to give shoppers a reason to keep swiping.
Copywriting for Carousel Ads
Strong copy turns a swipe into a click. Know the character limits before you write a single word.
Headline and description limits
Each card headline caps at 40 characters. Descriptions run up to 90 characters at the ad level. Both limits are strict. Google will reject copy that runs long.
Card-level vs. ad-level headlines
Card-level headlines apply on non-Discover placements. They let you tailor the message to each specific product shown. Ad-level copy applies across the entire carousel. Use card-level headlines to highlight the individual product. Use ad-level copy for your brand promise or offer.
Business name and CTA guidelines
Your business name should match your verified domain. Keep CTAs direct and action-oriented. "Shop now," "See the collection," and "Get yours today" outperform vague phrases. Write as if the shopper is already interested, because on Discover and YouTube, they often are.
Step-by-Step. How to Create a Google Carousel Ad for Ecommerce
Six steps. Follow them in order.
Step 1. Prepare your product images
Select 2 to 10 product images. All must share one aspect ratio. Aim for 1200x1200 (square) or 1200x628 (horizontal). Check that every file is under 5MB and saved as JPG or PNG. Reject anything blurry or off-brand before uploading.
Step 2. Choose and optimize your carousel format
Pick one aspect ratio for the carousel. Per Google Ads documentation, Google recommends testing one carousel with horizontal images and a second with square images. Running both helps you learn which format drives better results for your audience and placements.
Step 3. Write headlines and descriptions
Draft a card-level headline for each image. Stay under 40 characters. Write your ad-level description next. Stay under 90 characters. Read each headline out loud. If it sounds generic, rewrite it. Every card competes for the swipe.
Step 4. Set up your Demand Gen campaign in Google Ads
Open Google Ads and create a new campaign. Choose "Sales" or "Website Traffic" as your goal. Select "Demand Gen" as the campaign type. Configure your targeting, including devices, locations, and languages. Set your bidding strategy and daily budget before moving to ad groups.
Step 5. Add carousel ads to your ad group
Inside your ad group, select "Carousel ad" as the format. Upload your images one by one. Add card-level headlines. Fill in the ad-level description, your business name, and the destination URL for each card. Double-check every URL before saving.
Step 6. Review, test, and launch
Check each card for policy compliance. Note. if one card is disapproved, your ad status shifts to "Approved (limited)." If not resolved, it moves to "Disapproved" within 24 hours. The review period takes a minimum of 24 hours. Submit, then monitor performance closely in the first 48 hours after launch.
Best Practices for High-Converting Carousel Ads
Getting the setup right is the floor. These practices raise the ceiling.
Storytelling across cards
Do not just list products side by side. Build a visual progression. Card one. a lifestyle shot or problem context. Cards two through five. specific product features or benefits. Final card. a clear offer or social proof. A story keeps fingers swiping to the end.
Test horizontal vs. square formats
Google's own guidance recommends running separate carousels for each aspect ratio. Square images often perform better on mobile Discover feeds. Horizontal images can win on Gmail. Do not guess. Run both and let the data tell you.
Consistency in visual style
All cards should feel like they belong together. Use a consistent background color scheme, lighting style, and font treatment. Jarring visual jumps between cards break the browsing experience and hurt swipe-through rates.
A/B testing carousel variations
Swap card order to find which product leads best. Try different card-level headlines on the same images. Even small copy changes can shift click-through rate. Run one variable at a time so results stay clean and actionable.
Avoiding common mistakes
Do not mix aspect ratios in one carousel. Do not upload images at minimum dimensions when recommended dimensions are achievable. Do not write card headlines that all say the same thing. Each card should earn its place in the sequence.
Carousel Ads vs. Shopping Ads. Which Should You Use?
Both formats show products. They work very differently.
Carousel ads (creative-driven, feed-independent)
Carousel ads are manual. You choose every image, write every headline, and control every card. They are not connected to your Google Merchant Center product feed. Per Google's Ads Help Center, product feeds from Merchant Center cannot be used with carousel ads in Demand Gen campaigns. That gives you full creative control over the story you tell.
Shopping carousel ads (feed-dependent)
Shopping ads pull directly from your Merchant Center feed. Product title, price, and image come straight from your data. Less creative control, but faster to scale when your catalog is large and constantly changing.
When to use each format
Use carousel ads for brand storytelling, new product launches, or seasonal campaigns where creative matters. Use Shopping ads for broad catalog coverage and price-comparison moments. Many ecommerce brands run both simultaneously. Carousel handles brand narrative. Shopping handles search intent.
Accelerate Carousel Creation with AI
Producing 10 polished product images for multiple carousel variations is slow work. AI cuts that time substantially.
Generating product images at scale
Coinis Image Ads generates product-ready creatives from a product URL. Drop in your link. Get on-brand visuals built for multiple formats, powered by cutting-edge AI models. No designer, no brief, no back-and-forth. Coinis publishes natively to Meta today. For Google Ads, export your finished creatives and upload directly to your Demand Gen campaign.
Editing and resizing images for consistent dimensions
Coinis Revise handles the spec work. Smart Resize converts one creative to horizontal, square, or vertical in one click, keeping your carousel consistent across every format you test. AI Upscale brings low-res product shots up to recommended dimensions without rebuilding the image. Edit text on image lets you update card-level headlines without touching the underlying creative.
A/B testing variations quickly
Variate inside Coinis Revise generates multiple versions of the same creative automatically. Different color treatments, layout variations, and copy combinations across carousel cards. More tested variations means better performance data, faster. No manual export and re-import loop for every single tweak.
Or let Coinis do it.
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Frequently Asked Questions
Can I use Google Merchant Center product feeds with carousel ads?
No. Per Google's Ads Help Center, product feeds from Merchant Center are not compatible with carousel ads in Demand Gen campaigns. Every card must be manually uploaded with your own selected images.
How many images can a Google carousel ad have?
Between 2 and 10 images per carousel. All images in the same carousel must share one consistent aspect ratio.
What happens if one card in my Google carousel ad gets disapproved?
Your ad status shifts to 'Approved (limited).' If the issue is not resolved, it moves to 'Disapproved' within 24 hours. During the limited period, other cards in the carousel may still serve.
What aspect ratio is best for Google carousel ads?
Google recommends testing both horizontal (1.91:1) and square (1:1) in separate carousels. Square tends to perform well on mobile Discover feeds. Horizontal often wins on Gmail. Run both formats and let performance data guide your final choice.