How to Fix YouTube Fullscreen Problem

A friend of mine is a total YouTube addict for his channel. He complained to me that he got in trouble with YouTube fullscreen problems a few days ago. The fullscreen button appears in the lower right corner, but isn't responsive. "Why is my YouTube video not full screen?" You probably have the same question as my friend. Actually, YouTube fullscreen not working issue is a frustrating common error reported by numerous YouTube users while watching preferred videos. Don't worry, here you can find some solutions to fix YouTube in fullscreen problem.

Why is YouTube fullscreen not working? Actually, there are many cases leading to YouTube fullscreen glitch issue. Let's check the related solutions to fix full screen on YouTube not working problem now.

1. Update Graphics Card Driver

Sometimes, YouTube videos full screen problems are probably caused by outdated video card driver. Set Windows system as an example. You can follow the steps below to update your PC graphics card driver for fixing YouTube screen problem.

Step1: Open "Control Panel" and click "Hardware and Sound", then go to Device Manager.

Step2: After opening the Device Manager, expand Display adapters and right-click on graphics card and choose "Update Driver Software…".

Step3: It will go to corresponding manufacturer's official website, where you can download and install the latest driver to possibly fix YouTube fullscreen bug.

2. Update Browser & Flash Player

If you're using Google Chrome, you may experience YouTube fullscreen not working Chrome which is mainly caused by the out-of-date version of browser and Flash Player. Besides updating your browser to the latest version, you can also follow the method to check whether or not the browser supports HTML 5 player and make it available.

Step1: Visit https://www.youtube.com/html5 to check whether the browser supports html5 player.

Step2: Make sure "HTMLVideoElement" and "The HML5 player is currently used when possible" are checked.

Similarly, while most YouTube videos use html5 player now, a few videos still supports Flash player. So go to http://www.adobe.com/software/flash/about/ to check if your Flash plugin is up-to-date. If not, update Flash there to fix YouTube screen size problem.

3. Disable Hardware Acceleration

You may be encountered with the problem after you have checked and updated your browser and players, fullscreen not available YouTube issue still exists. Here I show you a more detailed procedure to fix YouTube fullscreen not full screen on Google Chrome. It also applies to Safari YouTube full screen and Firefox full screen YouTube issues.

Step1: Just go to your Chrome address bar, type " chrome://settings/ " and hit "Enter"

Step2: Then, click on the "Advanced" button.

Step3: Scroll down and find "Use hardware acceleration when available".

Step4: Disable the hardware acceleration option.

Now you can open YouTube to check whether YouTube full screen problems are gone.

4. Disable Add-ons/Extensions/Applications

Certain browser add-ons/extensions/applications may make YouTube videos not full screen, e.g. AdBlock. Try disabling your plugins one by one until you determine which is causing YouTube not showing full screen mode.

Step1: Open Chrome and go to chrome://extensions.

Step2: Disable single extensions and open YouTube fullscreen mode.

Step3: If the fullscreen mode works, you don't need to disable other extensions anymore. If it doesn't, disable extension one by one to find the one.

5. Enter the Original YouTube Page

Another kind of YouTube not fullscreening properly problem is special. If you cannot watch embedded videos in YouTube full screen size on other sites out of YouTube, the most likely reason is the website administrator has disabled the fullscreen function. You should click the "YouTube" icon in the lower right corner to watch the original videos on YouTube.com.

How to fix YouTube fullscreen glitch? As you can see, downloading YouTube videos is also a good method to fix full screen YouTube not working issues.

You must get all the common solutions to YouTube not going fullscreen now. However, you can find that this problem relates to many aspects, so you need time to eliminate the irrelevant factors and find the crux. Meanwhile, due to the differences of browsers, Operating Systems, development of the internet and other unknown reasons, the solutions above may not be appropriate for all of you. In this case, you are highly recommended to download YouTube video which applies to all situations without any trouble.

Also, you are welcomed to share your experience below if you've solved YouTube full screen problem.