Bluesky image sizes
Avatar
1:11000×1000
Displayed circular. Upload square for best results.
Verified July 20, 2026
Banner
3:13000×1000
3:1. Keep critical content away from the edges.
Verified July 20, 2026
Post image
1:12000×2000
Up to ~2000px on the long edge; square is common.
Verified July 20, 2026
External link card
40:211200×630
≈1.91:1. Standard OG-style preview.
Verified July 20, 2026