Best Way to Design Google Carousel Ad

What Is a Google Carousel Ad?

Google carousel ads are swipeable image cards that appear natively on Discover, Gmail, YouTube feeds, and the Google Display Network. Users swipe through 2 to 10 cards. Each card shows a unique image and can link to its own landing page. One ad. Multiple products. One story.

Format and where carousel ads appear

Carousel ads run inside Demand Gen campaigns. Google places them across high-intent browsing surfaces on both mobile and desktop. They look native, not interruptive.

Swipeable card design for storytelling

Each card carries an independent image and URL. That makes carousels ideal for product collections, seasonal promotions, and step-by-step narratives. The format rewards creative thinking, not just good specs.

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Key Image Specifications for Carousel Ads

Per Google's Ads Help Center, every image in a carousel must pass these technical requirements before it serves.

Recommended image dimensions by aspect ratio

• Horizontal (1.91:1): 1200×628 px recommended. Minimum: 600×314 px.
• Square (1:1): 1200×1200 px recommended. Minimum: 300×300 px.
• Vertical (4:5): 960×1200 px recommended. Minimum: 480×600 px.

Always hit the recommended resolution. Minimum-spec images can appear soft on high-density screens.

Aspect ratio consistency across cards

Every card in a single carousel must use the same aspect ratio. Mixing ratios causes rejection or limited serving. Choose one ratio per carousel and build all cards to match.

File size and format requirements

Max file size is 5 MB per image. Accepted formats are JPG and PNG. Logos must be 1:1 ratio. Minimum logo size is 144×144 px. Recommended logo size is 1200×1200 px. Max logo file size is 150 KB.

Number of cards (2–10 images)

You need at least 2 cards. The maximum is 10. Google's documentation recommends uploading 3 images per aspect ratio to maximize placement coverage across feeds and devices.

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Design Best Practices for Carousel Ads

Correct specs get the ad approved. Smart design gets it clicked.

Test horizontal vs. square images for your brand

Run one carousel with horizontal images. Run another with square images. Different placements favor different ratios. Let real performance data pick the winner rather than guessing.

Create a visual story across cards

Treat the carousel as a sequence, not a scrapbook. Card 1 grabs attention. Cards 2 through 5 build the case. The final card drives the action. Random product shots waste the format.

Use high-quality, real images with natural backgrounds

Per Google's creative guidance, real photos with natural lighting outperform generic stock. Avoid cluttered or artificial-looking backgrounds. Give your subject visual breathing room.

Keep text simple and legible

Avoid overlaying heavy text on images. If you must add text, keep it short and large enough to read on a small screen. Let the ad-level copy fields carry the message.

One headline and description per ad (not per card)

One ad-level headline and one description apply across all cards. Card-level headlines are available on YouTube and Gmail placements only. Write copy that works for every card in the set.

Include card-level CTAs for each product

Each card can point to a unique landing page. Send card 1 to sneakers and card 2 to boots. One carousel. Multiple destinations. Higher relevance for every swipe.

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Carousel Ad Sizing Guide

| Format | Recommended | Minimum |

|---|---|---|

| Horizontal (1.91:1) | 1200×628 px | 600×314 px |

| Square (1:1) | 1200×1200 px | 300×300 px |

| Vertical (4:5) | 960×1200 px | 480×600 px |

| Logo (1:1) | 1200×1200 px | 144×144 px |

Why you should upload 3 of each aspect ratio

Google rotates image assets automatically across placements. Three images per ratio gives the algorithm more to test. More variation means better coverage and more useful data.

Logo specifications and safe zones

Gmail renders some logos as circles, cropping roughly 5% from each corner. Keep your logo's key elements centered. Avoid placing icons or brand text near the edges of the logo asset.

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Common Carousel Ad Mistakes to Avoid

Mixing aspect ratios within a single carousel

Google rejects mixed-ratio carousels or limits their serving. Use one ratio per carousel. Full stop.

Overloading images with text

Text-heavy images look cluttered on small screens. They can also trigger policy flags. Keep visuals clean.

Using low-quality or generic images

Blurry photos and generic stock both hurt performance. Use real product shots or original brand photography.

Neglecting the full ad preview before launching

Google Ads Manager shows a preview across placements before you publish. Check every card. Catch cropping issues before the campaign goes live and budget starts moving.

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How to Build and Optimize Carousel Ads in Google Ads

Creating the carousel in Demand Gen campaigns

Open Demand Gen in Google Ads. Create a new ad. Select the carousel format. Upload your images organized by aspect ratio.

Setting per-card headlines and landing URLs

Assign each card its own landing page URL. On YouTube and Gmail, add card-level headlines for tighter message match per product.

Choosing automation for CTAs

Google can auto-generate CTAs from your landing page. You can also set them manually per card. Manual control gives you cleaner message alignment, especially across a mixed-product carousel.

A/B testing horizontal vs. square variants

Run both carousel variants simultaneously. Give each at least a week of impressions before reading the data. One ratio will outperform. Scale it.

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