Loomly Ads Manager supports single image, single video, and Carousel ads.
Single image ads
Image guidelines
Recommended image dimensions: 1200 x 628 pixels.
Minimum width and height: 600 pixels.
Recommended aspect ratio: between 9:16 to 16:9, but crops to 1.91:1 with a link.
Recommended image format: JPG and PNG.
Images with 20% text or more could increase the chances of failed delivery.
Character limits
Text: 125 characters.
Headline: 25 characters.
Link description: 30 characters.
Single video ads
Video guidelines
Minimum dimensions :600 x 315 (1.9:1 landscape) or 600 x 600 (square).
Recommended aspect ratio: between 9:16 to 16:9 (Horizontal: 16:9, Square: 1:1, Vertical: 4:5 or 2:3 and Full Portrait: 9:16).
Recommended video formats: .MP4 and .MOV (see full list here).
Character limits
Headline: 25 characters.
Link description: 30 characters.
Carousel ads
Carousel ads let you use a combination of all other ad types, running from 2 to 10 images, slideshows, or videos in one single campaign.
Image guidelines
Minimum width and height: 600 pixels (minimum 254 x 133 pixels for Messenger Home Carousel Ads).
Recommended image dimensions: at least 1080 x 1080 pixels
Recommended ratio: 1:1
Max image size: 30MB.
Recommended image formats: JPG and PNG.
Images with 20% text or more could increase the chances of failed delivery.
Video guidelines
Recommended resolution: minimum of 1080 x 1080.
Recommended video formats: .MP4 and .MOV.
Video thumbnails with 20% text or more could increase the chances of failed delivery.
Character limits
Text: 125 characters.
Headline: 40 characters.
Link description: 20 characters (optional on Instant Articles).