We recommend the following format for the optimal performance per image size:
S = 16:9 (Example: 2048 x 1152 px)
M = 4:3 (Example: 2048 x 1536 px)
L = 5:4 (Example: 2048 x 1638 px)
XL = 1x1 (Example: 2048 x 2048 px)
What is the best format for images in my funnel?
Find our recommended formats here.