What keyboard shortcut will open up full screen mode while playing YouTube videos?
Viewing on a Windows 7 machine.
If the YouTube video is the active part of the screen, F seems to work for me.
While not a simple shortcut, there are several ways to achieve fullscreen play without a mouse:
Visit https://youtube.com/html5 and opt-in to the experiment.
After that most (but not all) youtube videos will use the native
<video> tag instead of Flash, with a slightly different UI. The fullscreen control is reachable in this UI by pressing (quite a lot) Tab/Shift+Tab.
Edit the URL (Alt+D) from
https://youtube.com/watch?v=t9HMeYs2Yas form to
This will give you the player filling the whole browser window; you can now press F11 to really go full screen (being browser fullscreen, it behaves better than Flash fullscreen, especially with multiple monitors).
A major drawback is that you're trapped into that one video — no access to comments, related videos, search etc.
Edit the URL to
https://www.youtube.com/tv#/watch?v=t9HMeYs2Yas form (if you're signed in you can just visit https://youtube.com/tv, navigate Up to My Watch History and press Enter to open your last video).
This is by far the most keyboard-friendly way to consume youtube.
Unfortunately, there is no built-in keyboard shortcut for going full screen on Youtube.
This is the current list of shortcuts.
Press F11 it will display the video in full screen and when you press Esc it will change it back to normal size.
There seems to be some indication that pressing F should switch to full-screen mode, but http://www.makeuseof.com/tag/comprehensive-guide-youtube-player-keyboard-shortcuts/ states that it doesn't work for everyone. Didn't work for me, anyway.
You can check out these links and create your full screen YouTube launcher.
It’s quite simple, just press Shift+F.