https://techcrunch.com/2021/11/11/twitter-no-longer-crops-image-previews-on-the-web/

Twitter will no longer automatically crop image previews on the web after rolling out full-size image previews on mobile earlier this year. On Twitter for the web, images will now display in full without any cropping. Instead of gambling on how an image will show up in the timeline, images will look just like they did when you shot them.

In the past, the platform automatically cropped images to make them display in a more condensed way in the timeline, where users often scroll through without clicking on an image preview. The social media giant first tested the change in March with a small subset of iOS and Android users, saying it wanted to give people an accurate preview of what an image will look like.