💡 For best results, start with an image at least as wide as the target size. Upscaling small images can introduce blur.
Ready
Mastodon profile picture 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
Mastodon profile pictures render at 400×400 on profile visits and 32×32 in the federated timeline. The recommended upload is 400×400. Mastodon auto-masks avatars with a circle.
Crop the central content of your image to the central 80% of the frame. Mastodon Profile 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
Does Mastodon crop to a circle?
Yes. All avatars are masked to a circle.
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 400×400 pixel PNG — all in your browser, no upload required.
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