Tumblr image sizes
Avatar
1:1128×128
Displayed circular or square by theme.
Verified July 20, 2026
Blog header
600:2113000×1055
Wide header; keep key art centered.
Verified July 20, 2026
Photo post
2:31280×1920
Tall photos work well; max useful width ~1280px.
Verified July 20, 2026
Link card image
40:211200×630
≈1.91:1 for shared links.
Verified July 20, 2026