All Substack image sizes
2 sizes with exact pixel dimensions, and a free resizer for each one.
| Size | Pixels | Ratio | Resize |
|---|---|---|---|
| Header Image | 1100 × 220 | 5:1 | Resize Substack Header Image |
| Publication Logo | 256 × 256 | 1:1 | Resize Substack Publication Logo |
Substack resizers
About Substack images
Substack's visual requirements are minimal — a publication logo and header image. The platform prioritizes writing over visual design, but these two assets set the tone for your newsletter.
Since Substack newsletters are primarily consumed via email, images need to look good in email clients as well as on the web.