Substack Image Size FAQ: The Definitive Guide
Hero Layout
Q: What is the Feature layout image size?
A: The featured image for the Feature layout is 642 × 362 pixels. However, some have found 1456 × 1048 to be better.1
Q: What are the Newspaper layout image sizes?
A: The center image for the Newspaper layout is 626 × 418 pixels. Thumbnails in the left column are 282 × 188 pixels, while thumbnails in the right column are 66 × 66 pixels (an aspect ratio of 1:1).
Q: What is the Magazine layout image size?
A: The center image for the Magazine layout is 626 × 418 pixels. Thumbnails in the side columns are 282 × 188 pixels.
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Post Layout
Q: What is the List layout image size?
A: List layout thumbnails are 162 × 120 pixels. Note that these images can be hidden by making sure the “Hide images from list” box is checked.
Q: What is the Grid layout image size?
A: Thumbnail images for both the Grid post layout are 282 × 188 pixels.
Q: What is the Groups layout image size?
A: Groups layout thumbnail images are also 282 × 188 pixels.
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Other Images
Q: What image size should my logo be?
A: Your logo should be at least 256 × 256 pixels. Logos have an aspect ratio of 1:1.
Q: What is the cover image size?
A: A cover image must be at least 600 × 600 pixels. However, the cover image will be scaled down to 324 × 324 at the largest. The cover image is only displayed on the welcome page.
Q: What size should in-article banner images be?
A: Substack articles are 730 pixels wide. Therefor, in-article banner images should be at least 730 pixels wide. However, it’s important to note that in-article images automatically scale down when they’re larger than that.
Q: What is the word mark image size?
A: The word mark is a stylized image version of your publication name. It’s displayed in the navigation bar at the top of your publication. The word mark should be at least 1344 × 256 pixels. The aspect ratio for a word mark is 21:4.
Q: What is the social/post preview image size?
A: Substack recommends at least 1456 × 1048 pixels, but a logo can be as small as 420 × 300 pixels. Substack claims that the aspect ratio for social preview images is 14:10, but it’s slightly off, which results in poorly cropped images when relying on ratio alone for your image sizes.
Q: What is the image size for email banners?
A: The recommended image size for email banners is 1100 × 220 pixels, although they can be taller.
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Vance, Johnathan. “The Lazy Author’s Substack Bible”, Visceral, Lyrical Grimdark, 17 Apr 2025, https://lazyauthorpromo.substack.com/i/161758710/design-your-substack-like-a-website
Post layout options no longer includes "Groups" and now offers "Feature". The feature image sizes seem to be identical to the "Highlights" hero/header section.
The link for "welcome page" in the question "Q: What is the cover image size?" goes to a website openintel.ca? Hope I didn't just send myself a virus...