Seriously, it’s been two months that I’ve been searching for this basic information and still nothing concrete (you’d think it’d be in the docs). FWIW, as close as I can figure it through experimentation, it’s roughly 4:1.15, e.g., 1920×552px or 800×230.
I don’t think there’s a fixed aspect ratio or resolution size for community banners. But your instance might have resolution or file size limits for uploading photos. You can ask your instance admin about it.
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