Resize for Substack Header

Auto-set to 1100×220 pixels. Newsletter header at Substack's optimal width.

Drop your image here 🍡

PNG, JPG, WebP, BMP — any size, mochi handles it all

Resized Image
Result
Dimensions
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File Size
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Image too small? Sharpen first

If your image is smaller than the target size, use Sharpen for better clarity, then resize.

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Continue your workflow

Crop Profile Picture →Compress Image for Web →Crop Image to 16:9 →
Type Dimensions Ratio
PlatformSubstack
Image TypeHeader
Dimensions1100×220 px
Aspect Ratio5:1

Frequently Asked Questions

What size is a substack header?
Substack recommends 1100×220 pixels for this image type. Uploading at this exact size ensures the best display quality without platform-side compression.
What format works best for Substack?
JPEG works best for photos on Substack. PNG is ideal for logos and graphics with transparency. Keep file size reasonable for fast loading.
Can I use this for multiple platforms?
This tool is optimized for Substack's specific dimensions (1100×220). Other platforms may require different sizes. Check our other platform-specific resize tools.