The social network is considering letting users edit photos with the addition of "sticker" images such as hearts to add a bit of personalisation. It could also suggest images to post and show how pictures have been changed by other users.
According to Re/Code, which first reported the story, the feature is being tested among select users and it's experimenting with different names - Stamptags, Taptags and Stickits.
A similar feature on Facebook lets people add smiley faces and other images to photos before they are posted.
Stickers is the latest in a string of innovations designed to increase Twitter's flagging user growth.