The YouTube app will make horizontal, vertical and square videos all look great

Who cares if they’re vertical or horizontal? Shot on a mobile phone or DSLR? Square, 4:3 or 16:9? In the coming weeks, the YouTube mobile app will dynamically adapt to whatever size you choose to watch it in. That means if you’re watching a vertical, square or horizontal video, the YouTube player will seamlessly adapt itself, filling the screen exactly the way they should.

Learn more:
https://youtube.googleblog.com/2017/06/updates-from-vidcon-more-users-more.html
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