What about profile picture size?

400×400 px square — different asset from header.

Why does my header look cropped on mobile?

Mobile uses a narrower viewport; design with safe margins.

spec · image

X (Twitter) profile header is 1500×500 px, 3:1 ratio. Mobile crops sides — keep subject centered.

Updated 2026-05-21

Asset	Size	Max file	Formats
header	1500×500	5120 KB	jpg, png
profile_photo	400×400	2048 KB	jpg, png

Official source · verified 2026-05-21

Profile header 3:1. Display may crop on mobile.

What is the X (Twitter) header image size?: 1500×500 pixels recommended.
What about profile picture size?: 400×400 px square — different asset from header.
Why does my header look cropped on mobile?: Mobile uses a narrower viewport; design with safe margins.