mojo exports videos in HD.
Here are the exact pixels dimensions for each format:
portrait (9:16 ratio) - 1080 x 1920 pixels
instagram feed (4:5 ratio) - 1080 x 1350 pixels
square (1:1 ratio) - 1080 x 1080 pixels
landscape (16:9 ratio) - 1920 x 1080 pixels