Outbrain Carousel ads are square 1:1 still images, measured at 1200×1200 px, up to 2.5 MB per file, delivered as JPG or PNG. They run in the Native — In the Feed (managed only) placement on Outbrain. Use these requirements to brief designers, validate uploads, and avoid creative rejections in Outbrain's ad manager.
| Dimensions | 1200 × 1200 px |
|---|---|
| Aspect ratios | 1:1 |
| Orientation | square |
| Max file size | 2.5 MB |
| File types | JPG, PNG |
| Headline | 60 chars |
|---|
Card image: JPG or PNG, 1:1 ratio, min 300px, max 1200px, up to 2.5 MB per image (GIF/MP4 cards up to 30 MB). 3 cards minimum, 10 maximum. Main title up to 100 characters (60 recommended). Card title up to 100 characters. Brand name up to 60 characters. Brand logo 1:1 ratio, min 40px, max 400px. CTA selected from a dropdown list of 20+ options. Card URL is mandatory. Best for consideration and performance. Devices: all.
Official source: https://www.outbrain.com/help/ads-specs/#carousel