We’ve found that these are the best image dimensions for your publication’s design elements:
- Logo: At least 256 x 256 px with a transparent background.
- Email banners: Recommended 1100 x 220 px with a transparent background, but could be taller.
- Cover image: At least 600 x 600 px.
- Social / post preview image: We recommend at least 1456 x 1048 px, but 420 x 300 px is the minimum. 14:10 is the aspect ratio for the preview images.
- Full-width images: The maximum aspect ratio is 1:1 for height — taller images will be automatically cropped to 1:1.
To get more tips from our Substack design team, check out our design guide here.
