Tumblr image sizes
Avatar
1:1128×128
Shown as a circle or square, depending on the theme.
Verified July 22, 2026
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Blog header
16:92048×1152
Official recommended header size.
Verified July 22, 2026
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Photo post
2:31280×1920
Best for tall photos. Maximum useful width is about 1280px.
Verified July 22, 2026
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Link card image
40:211200×630
Used for shared link previews.
Verified July 22, 2026
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