The recommended Twitter/X post image size is 1200×675 px (16:9). This displays inline in the timeline without cropping. Max file size is 5 MB for photos.

The Twitter/X header photo size is 1500×500 px (3:1 ratio). Keep important content centered and away from the bottom-left corner, which is partially covered by the profile picture.

Twitter/X profile pictures should be 400×400 px (1:1 square). They display at 200×200 px on profiles and smaller in the timeline. The image is cropped to a circle automatically.