Substack cover image size
The recommended Substack publication cover image size is 600 × 600 pixels (1:1 aspect ratio).
Last updated:
Specifications
| Spec | Value |
|---|---|
| Dimensions (px) | 600 × 600 px |
| Aspect ratio | 1:1 |
| Minimum resolution | 600x600 |
Design at this size with Moda
Start with a canvas pre-set to 600×600px and let AI generate your design.
Create a Substack publication cover image →Design tips
Substack recommends a publication cover image at least 600×600 pixels. A square source keeps the cover usable in compact publication and discovery surfaces without depending on a wide crop.
- •Use a square image at least 600×600 pixels.
- •Keep the focal point and any title treatment legible at thumbnail size.
- •Create a separate square composition instead of center-cropping the email banner.
What you need to know
The publication cover image is separate from the email banner, logo and social preview. Substack's image guide sets a minimum square source of 600×600 pixels.
Use a larger square if the artwork contains detail, but keep the focal point and title treatment readable at thumbnail size. The minimum describes source resolution, not guaranteed on-screen display size.
Avoid reusing a 5:1 email banner here. The cover is square, while the email banner and wordmark are deliberately wide assets with different placement behavior.
How to create a Substack publication cover image at the right size
- 1Open Moda and create a square canvas at least 600×600 pixels.
- 2Compose the cover so its subject remains clear at thumbnail size.
- 3Export the finished image and upload it as the publication cover in Substack.
Frequently asked questions
What size should a Substack cover image be?
Substack recommends a square cover image at least 600×600 pixels.
Is a Substack cover image the same as the email banner?
No. The cover is at least 600×600 pixels; the recommended email banner is 1100×220 pixels.
Specs last verified: August 28, 2026. Dimensions may change as platforms update their requirements.