It is unclear if videos will also remain uncropped with this update.

A new kind of surprise: show off more of your pic when you Tweet a single image.

Now available to everyone on Android and iOS –– how your image looks in the Tweet composer is how it will look on the timeline. https://t.co/GTD4JGVXmY pic.twitter.com/u5X2kc8dzO

— Twitter Support (@TwitterSupport) May 5, 2021

Up until now, 16:9 and 4:3 aspect-ratio images appeared cropped in the Twitter timeline and would only appear fully when a user tapped on the cropped preview.

Twitter initially announced a test for this change last month – around the same time it announced the ability to upload and view 4K images on its platform.

Sometimes it's better said with a picture or a video. Over the next few weeks, we’ll be testing some ways to improve how you can share and view media on Twitter. ?

— Twitter Support (@TwitterSupport) March 10, 2021