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5KPlayer > YouTube Download > Fix YouTube Won't Go Full Screen
Written by Christina
YouTube won't go fullscreen problem is totally annoying, here below are the top quickest fixes and workarounds.
Some certain YouTube video won't fullscreen is reported by many users watching online YouTube videos in Chrome Firefox Safari on mobile devices like iPhone Android phone and Macbook Windows 10 PC alike. This seems to be a bug of YouTube or of the browsers we use, but neither the YouTube nor the browers sides have officially explained the problem or given an ultimate solution as if they do not care for over 5 months now. How to completely fix YouTube video won't play full screen problem? We have to deal with it on a case-by-case basis.
Online YouTube video won't go full screen, how about having it downloaded within a sec and watch it in full screen mode without gliches or buffering? Seems like making a fuss about itm, but things will surely go 100% smoothier with this YouTube video downloader in fullscreen mode.
YouTube won't play full screen in Chrome Firefox Safari is the most commonly met problem. Here, let's make sure that those browsers are not getting in the way of fullscreen mode by firstly upgrading those browers to the latest version availiable and reboot the browsers. If the fullscreen not working problem still exists, then follow the instructions concerning each browsers below respectively to enable automatic fullscreen.
Fix YouTube Wont Fullscreen Chrome:
1. Open the YouTube video in Chrome on your computer, Windows 10 or Mac.
2. In the address bar, click the Lock icon ahead of the "https". For other sites' fullscreen display permission setting, you may click the Page icon.
3. Under the Permissions tab, find the site's Full Screen setting
Note: if you cannot see it in the list, click the "Site settings" and you'll then be directed to Chrome setting page.
4. Slide down to find full screen setting and click manage exceptions to enable this YouTube video page.
5. Click the "Manage Exceptions" to set the YouTube video fullscreen permission.
Fix YouTube Wont Fullscreen FireFox:
You may have read about the instruction below as i did in YouTube Help Center about "YouTube fullscreen disabled". It is said that
"On Firefox, try the following steps:
1. In the location bar (where you enter URLs), type "about:permissions" and hit enter.
2. Under "All sites", look at the permissions for sites you may have used fullscreen on, like youtube.com
3. You'll see a Fullscreen setting. Select "Always ask" or "Allow" to allow YouTube to go fullscreen on these sites.
4. Try using fullscreen on YouTube again."
However, this instruction did not work out for me, because, first i couldn't find the Permissions for sites by typing "about:permissions" in the location bar and when i did get there (another way to enter Firefox permission page is to right-click a Firefox page, select View Page Info, and click Permissions), there was no Fullscreen Permission item listed for setting. The reason is that Firfox has enabled HTML full-screen API to replace this permission. Only the below two workarounds are tested and confirmed:
YouTube Fullscreen not working in Firefox/Chrome top workaround 1:
The another most possible reason to YouTube won't fullscreen problem might be that your internet connection is not so good which leads to online YouTube video glitches so that it fails to send "go fullscreen" instruction to your browsers automatically. Users have to do it manually:
Hit F11 to let the browers go full screen and simultanously the video will fill the entire screen. This is at present the most efficient and convenient workaround for this matter since videos on Twitch, CNN and NFL.com sometimes won't go fullscreen properly too and the case is not YouTube-exclusive, while the only petpeeve of this method is that you have to press F11 all the time. You may also try hardware acceleration before tapping F11.
YouTube Fullscreen not working in Firefox/Chrome/Safari top workaround 2: Use 5KPlayer and get rid of both browsers and poor internet connection factors completely!
No choppy playback, no gliches, a totally full-screen offline watching tool – 5KPlayer.
Even if the shortcut of F11 can make the YouTube video go full-screen, some videos of 4:3 aspect ratio won't fit your entire screen with black strips on both sides of the video. Therefore, you might need a real tool to adjust aspect ratio to make them fullscreen totally. 5KPlayer is born to help.
This YouTube downloader can quickly download almost any YouTube videos or videos from other over 300+ online sites including KissAnime, Vevo, Vimeo, Facebook, metacafe, CNN and NFL.com videos, and gives 100% smooth playback properly rendered. Then one can adjust the video aspect ratio on right click to make it a real fullscreen display. This YouTube video downloader player can handle over 4K 8K video and VR 3D video download and do adjustment like subtitle settings, synchronization, snapshot etc.
Quick guide on how to download YouTube videos with 5KPlayer:
Step 1: Copy the link of the video on your browser: Chrome, Firefox, Safari and what so ever.
Step 2: Paste the URL in the link adress box on the 5KPlayer YouTube download interface.
Step 3: Click "Analysis" button and wait for video content being analyzed.
Step 4: Click "Download" button when the video info strip is shown on the interface.
You can also choose the video format and resolutions you like before downloading the video.
At present, there is no official fix to this random YouTube fullscreen not working issue, but the provided 2 workarounds and settings checks can at least help ease the pain. Free download 5KPlayer now to enjoy both YouTube video fullscreen and offline smooth video playback as well as free video streaming to bigger screen previlege.
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