Substack Header Image Resizer

What matters

Substack Header Image dimensions at a glance

Substack headers at 1100×220 are narrow banners displayed at the top of your publication page. The 5:1 ratio limits visual complexity — treat it as a branding bar.

The header sets your newsletter's visual identity. A clean, on-brand header distinguishes your publication from the thousands of default Substacks.

Complex images become an unreadable smear at 220px tall. Detailed text is too small to read in this narrow format.

Best practices

Use the crop intentionally

• Keep it simple — publication name, optional tagline, brand colors.
• Use large, bold text if including any text at all.
• Test how it looks in email as well as on the web.