💡 For best results, start with an image at least as wide as the target size. Upscaling small images can introduce blur.
Ready
Substack profile picture size: the 2026 spec
This guide covers the official Substack profile picture spec and the practical workflow imgsize.cc uses to get it right in your browser.
Why 256×256 pixels
Substack profile pictures render at 256×256 on profile visits and 32×32 in the post byline. The recommended upload is 256×256. The 1:1 aspect ratio is mandatory — Substack auto-masks avatars with a circle.
Crop the central content of your image to the central 80% of the frame. Substack may crop or overlay UI elements near the edges, so critical content should stay well within the safe zone.
Common mistakes
Off-center subject — weird in circular crop
Text in the corners — illegible at thumbnail
Frequently asked questions
Can I use a logo instead of a photo?
Yes. Many Substack writers use logos. Keep the central content clear.
How imgsize.cc handles it
Drop your source image into the workbench above. The crop box defaults to a 1:1 aspect ratio. Resize, crop, and download as a 256×256 pixel PNG — all in your browser, no upload required.
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