Criteo Rich Media — Carousel ads are 1:1 still images, up to 50 MB per file, up to 30 seconds long, delivered as PNG, JPG, or MP4. They run in the Open Web / Retail Media — Rich Media Interactive (Managed) placement on Criteo. Use these requirements to brief designers, validate uploads, and avoid creative rejections in Criteo's ad manager.
| Aspect ratios | 1:1, 16:9, 9:16 |
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| Orientation | any |
| Max file size | 50 MB |
| File types | PNG, JPG, MP4 |
| Max duration | 30 sec |
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Required assets: HD logo, brand book, branding images and video, brand copy and URL redirection link. Image requirements: 3 images of the same ratio. Image aspect ratio: 1:1 (recommended 1200×1200). Image file type: PNG or JPG. Max image weight: 50 MB. Video ratios: 16:9 / 9:16. Video file type: .mp4. Max video size: 25 MB. Video resolution: 720p (or lower). Video max length: 30 seconds. Devices: Desktop, Tablet, Mobile. Service type: Managed Service only.
Official source: https://www.criteo.com/digital-ad-formats/