Resize Image for X (Twitter) Header (1500x500)

X gives you two image slots and they are nothing alike. The profile picture is a small 400 x 400 square shown as a circle. The header is a wide 1500 x 500 banner stretched across the top of your profile. People often size one and forget the other, which is why a profile can have a crisp avatar and a blurry, stretched banner.

This tool is set to the 1500 x 500 header. If you need the avatar instead, use the profile picture resizer, it is a separate page because it is a completely different shape and size.

Two things eat into a Twitter header. First, your profile picture sits on top of the bottom-left corner on desktop, covering whatever is there. Second, phones display the banner shorter than desktop, cutting the top and bottom edges.

The safe approach is to treat the center of the banner as the only reliable space. Put your name, tagline, or logo in the middle band, away from the bottom-left where the avatar lands and away from the top and bottom edges that mobile trims. Use the outer areas for background that can be cut without losing meaning. Upload at 1500 x 500, or 3000 x 1000 if you want it sharp on Retina screens.