Twitter, known for its 140-character limit on tweets, is now allowing users to post longer videos - of up to 140 seconds.
The microblogging site also said that some publishers would also be able to create videos that were as long as 10 minutes.
Twitter also launched Twitter Engage, a new mobile app that allows publishers to analyse interactions with followers.
Twitter previously restricted videos to 30 seconds.
The new 140-second limit also applies to Vine, Twitter's video streaming service, which previously had a six-second limit.
"Video is becoming increasingly central to the real-time conversations happening on Twitter," Jeremy Rishel, Twitter's vice president of engineering, wrote in a blog post.
The news comes a day after Twitter said it bought London-based Magic Pony Technology, a machine-learning startup that specialises in working with images, to deliver better video and picture content.
Twitter's shares were marginally higher in early trading on Tuesday.
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