Facebook stories ads show in between user’s Stories and can be either video or images. Video stories ads can be up to 15 second long and image stories ads can show up to 5 images.

View details on Facebook Video Stories »

View details on Facebook Image Stories »

Specs & Tips:

Image
Aspect ratios: 9:16 to 1.91:1
Maximum duration: 6 secs
Maximum file size: 30 MB
Supported image types: .jpg, .png

Video
Aspect ratios: 9:16 to 1.91:1
Maximum duration: 15 secs
Maximum file size: 4 GB
Minimum video width: 500px
Supported video types: .mp4, .mov