When I watch this YouTube video it's in Flash.

But when I click on this other video - that video is in HTML5.

Why are some videos in Flash and some in HTML5? Also how can I force HTML5 for videos (for example, when I want to use the speed-up feature)?


3 Answers 3


The issue with the first example is that you are not going straight to the video. Instead of watching as part of a playlist, view the video only: http://youtu.be/KqnB2Ew0SFM

This is the full URL: http://www.youtube.com/watch?v=KqnB2Ew0SFM Now you'll get all the features supported by HTML5.


The previous answers don't work for me, however switching my user agent to iPad/Safari will enable HTML5 playback.

  • This should be a comment.
    – serenesat
    Sep 25, 2015 at 3:03
  • @serenesat no it shouldn't. It answers the question. Answers don't belong in comments. Sep 25, 2015 at 19:56

You can do this by changing the URL with any video.

Simply take the video id (like the KqnB2Ew0SFM above in the 1st answer

and add it after this: http://www.youtube.com/watch_popup?v=

(getting http://www.youtube.com/watch_popup?v=KqnB2Ew0SFM if using that video)

This way, the video takes up your whole screen and is forced to play in HTML5 (well, just make sure you're in the HTML5 player trial to begin with, if you aren't already...you can opt-in by going to www.youtube.com/html5)

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