Tips for this size
Your profile picture covers part of the lower left, and phones crop the sides.
Upload at the exact size where you can, because platforms recompress images and resizing twice softens them. If your image has a different shape, it will be cropped or padded. The Image Resizer lets you choose, and everything runs in your browser. Work out other dimensions with the Aspect Ratio Calculator.
All X (Twitter) image sizes
| Image | Size (px) | Ratio |
|---|---|---|
| X (Twitter) header | 1500 × 500 | 3:1 |
| X (Twitter) post image | 1600 × 900 | 16:9 |
| X (Twitter) profile picture | 400 × 400 | 1:1 |
Platforms change their layouts from time to time, so check the current preview before an important post.