💡 For best results, start with an image at least as wide as the target size. Upscaling small images can introduce blur.
Ready
Substack publication logo size: the 2026 spec
This guide covers the official spec, format requirements, and the practical workflow imgsize.cc uses to get it right in your browser.
Why these dimensions
Substack publication logos render at 256×256 on the publication page and 32×32 in the post header. The 1:1 aspect ratio is mandatory. Use a high-quality brand mark.
Crop the central content of your image to the central 80% of the frame. Substack Publication Logo may crop or overlay UI elements near the edges, so critical content should stay well within the safe zone.
Common mistakes
Off-center mark — weird at 32×32
Text in the corners — illegible at thumbnail
Frequently asked questions
Can I update the logo later?
Yes. Substack keeps the last uploaded logo.
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.
Cookies, briefly.
We use cookies for two things: keeping the site working (your language preference) and suggesting the right one for your country. We don't sell your data. Choose what's comfortable. Read the cookie policy.
Cookie settings
Essential
Required for the site to work — language preference, basic state. Cannot be turned off.
Analytics
We use IP geolocation (ipwho.is / ipapi.co) to suggest your local language version, and may add privacy-respecting page-view analytics later. No personal identifiers, no cross-site tracking.
Marketing
We don't run ads or marketing pixels today. If we add any in the future, you'll be asked first.
