![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgzQ2TcfhxEnEDhkCOj_V-io5Yuoh4yLxUBZNHllTdG2VSIjVRqtxWLy-ZUzjFD-ywxQvYNnzGzyfrLWjbBaf84iv2t-M8gg6qubFfHD0COjJn8BtPL6SbyP7NAThRRQVlj1PDUcg/s1600/youtube-cache-1.png)
It turns out that YouTube's mobile app for Android now caches the videos you watch. If you watch a video again, YouTube no longer has to download the same chunked files: it uses the cache. After watching a video, I switched to the airplane mode and I could play the video offline, even if it's not supported by YouTube Music Key.
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh97ttL1qav3wUje6SNhK4SaQ8Flu35tAEAXDBCLXVsyVDl5BL-xrxNf7JQCt8rKGlnMwb7RIp9-RP4olgAjbZBChO50b4HrLc_DIL_iEeTBlpQe40sFOHu83EcvVeAtROwQE77FQ/s1600/youtube-cache-2.png)
Even YouTube's desktop site started to cache videos again. Since switching to adaptive streams (DASH) in the HTML5 player, YouTube downloaded videos every time you watched them, wasting a lot of bandwidth.
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgQSwVyGrZPCc59_ZDEXWvvLRgiNkRgi8jhgfuuDXk2MNLlEpmm1uG2s5L7cHVGse6w8_MexbbwlUGya-6u9LuF6ulAHUlZWvHyyuT4ZdJJOWAxW1Vq-2wW8xWSypSDbY9CQoi9rQ/s1600/youtube-cache-chrome.png)
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