The maximum number of images that can be attached to a tweet is four. Twitter introduced multi-image posting so users could combine several photos in one post instead of publishing a separate tweet for each image.
The four-image limit applies to the standard image attachment layout, where the pictures appear together in a collage or grid. Twitter also supports other media combinations, including a single video or animated GIF, but these do not increase the standard image count. The limit is about media attachments, not the number of people or objects visible in the photographs.
A common mix-up is confusing four attached images with Twitter’s older one-photo limitation. Before Twitter’s native photo-sharing tools and multi-image features, users often relied on third-party services such as TwitPic to share pictures. Twitter’s own integrated photo-sharing service was announced in 2011, making image posting more direct. Later changes to character counting also meant that attached photos and videos no longer consumed space from the original 140-character limit, although the media attachment limit remained a separate rule.