Twitch now allows simultaneous streaming in landscape and portrait modes, and has also introduced expanded 1440p streaming capabilities and a summary function for latecomers.

Twitch, the live streaming platform, is testing a feature that allows simultaneous streaming in landscape and portrait modes. Viewers will be able to watch the same stream in landscape mode on their PCs and TVs, and in portrait mode when holding their smartphones vertically.
Dual Format Streaming on Twitch (Beta)
Community First: Everything We Announced at TwitchCon Rotterdam 2026
https://blog.twitch.tv/en/2026/05/30/everything-we-announced-at-twitchcon-rotterdam-2026/
The simultaneous streaming function for both landscape and portrait screens is called 'Dual Format Streaming,' and a beta test is currently being conducted for streamers who have registered to participate in the test. Viewers can watch live streams using Dual Format Streaming even without participating in the test. When viewing on a landscape device such as a PC or TV, you can view the stream in landscape mode, and when holding a smartphone vertically, you can view it in portrait mode. Turning your smartphone horizontally will allow you to view the stream in landscape mode, just like on a PC.

The following streaming software is supported: OBS Studio, Streamlabs, Streamrun, and XSplit. OBS Studio is supported from version 31.1.2 onwards, with version 32.0.0 or higher recommended. Additionally,

When streaming in portrait mode on Twitch, you need to be mindful of the following when designing your layout: 'The Twitch header will be displayed in the top 48 pixels' and 'The chat and other elements will be displayed in the bottom half of the screen.'

Beta testers for Dual Format Streaming have already created a variety of layouts.

Dual Format Streaming was announced as part of Twitch's major event, ' TwitchCon Rotterdam 2026. ' Other updates announced at the event included '1440p streaming for all partners and affiliates,' 'providing summaries for viewers joining live streams midway,' and 'improving notifications at the start of live streams.'
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