You have four options of aspect ratios on Biteable Pro. You can choose them in the beginning of your video making process.
What's best for which platform?
16:9 ratio is good for anything landscape (Facebook, YouTube, Vimeo...)
1:1 is best for Instagram and Facebook feed videos
4:5 works for Vertical Instagram and Facebook feed
9:16 is Full Portrait for Instagram Stories, Facebook Feed, and Snapchat
You can also change your preferred aspect ratio after you start your video. Just click Video Settings in your editing page! :)
Also, since Biteable Pro is very new, we'd really appreciate your feedback going forward! Please let us know what you think here! Your insight helps us know which features we need to prioritize.