Buzz
Horizontal Rectangle Image: 1200 x 900 pixels
Vertical Rectangle Image: 900 x 1200 pixels
Additionally, here are other various ad image sizes for Facebook:
1. Facebook Ad Image Square
2. Facebook Ad with 2 Landscape Square Images
3. Facebook Ad with 2 Horizontal Images, one above the other
4. Facebook Ad with 4 Square Images
5. Facebook Ad with 1 Large Image on Top and 3 Small Images Below
6. Facebook Ad with 1 Main Image and 4 Small Horizontal Images
With standard image sizes and layout for Facebook ads, hope you can easily align and create images that meet your expectations when posting on Facebook.
