Carousel Ad Specifications

A carousel ad contains a headline, up to six images, and a destination URL. Images will be shown in feed and conversation placements. When clicked, redditors are taken to that image’s landing page. 

You can choose to enable comments for this ad type.

Text

	Maximum length	Quantity	Required
Headline	300 characters Recommended: ≤ 150 characters	1	✓
Destination URL	268 characters	1 for each image	✓
Caption	50 characters	1 for each image
Display URL	100 characters This must match your destination URL’s domain (e.g., reddit.com)	1 for each image

Image

We strongly recommend using the same aspect ratio for all images.

In most cases, any aspect ratio can be used, but it may cause formatting issues, like black bars appearing. Follow our recommendations to limit issues.

Required files	2–6
File type	JPG, PNG, or GIF
File size	GIFs: 3 MB Other file types: 20 MB
Recommended GIF length	3–10 seconds
Call to action	Choose from options

Cross-device

	Ratio	Resolution
	Portrait 4:5	1200 x 1500 px
	Landscape 4:3	1440 x 1080 px
	Landscape 16:9	1920 x 1080 px

Mobile

	Ratio	Resolution
	Square 1:1	1200 x 1200 px
	Portrait 4:5	1200 x 1500 px
	Landscape 4:3	1440 x 1080 px
	Landscape 16:9	1920 x 1080 px

Desktop

	Ratio	Resolution
	Portrait 4:5	1200 x 1500 px
	Landscape 4:3	1440 x 1080 px
	Landscape 16:9	1920 x 1080 px

Thumbnail (for compact view)

This image is only shown in compact view and is automatically generated based on the first image in the carousel. This image can be replaced with an uploaded file. 

File type	JPG, PNG, or GIF (will be converted to a still image)
Maximum file size	3 MB

Recommended resolutions

	Ratio	Resolution
	Landscape 4:3	400 x 300 px

Acceptable suggestions

Using a thumbnail with these or other ratios may cause formatting issues.

	Ratio	Resolution
	Square 1:1	300 x 300 px