Software Tips & Tutorials

[Solved] YouTube Fullscreen Not Working? Get Fix Tips to Solve YouTube Fullscreen Problem

Last Updated: Sep 12, 2019

How to Fix YouTube Fullscreen Not Working Problem on Chrome, Firefox etc.?

YouTube embeds a fullscreen option delivering a better view experience to watch HD videos on computer. It usually works well on browsers. But sometimes, YouTube won't go fullscreen like words described as following question: "When I click YouTube fullscreen button, it only fills my chrome browser window, whereas it used to actually go full screen. I haven't changed anything. Any help would be appreciated. Thanks in advance!"

UPDATE: Since Sep 11, 2019, I cannot advance or move back videos. Bar underneath does not work. Cannot x-out ads anymore either. The video now just has to run straight through. And I cannot get YouTube video playing in fullscreen.

How to fix YouTube fullscreen not working problem during playing videos on browsers, like Chrome, Firefox etc.? Read this article to get troubleshooting tips.

Download YouTube Videos and Play on PC with Fullscreen

WinX YouTube Downloader is one top-ranked YouTube video downloader available to download SD/(1080P) HD/4K/8K/3D videos from YouTube and similar sites (300+) while delivering original quality and help you achieve fullscreen playback on PC via video players without trouble. It is 100% FREE & SAFE!

Tips to Solve YouTube Fullscreen Not Working/Won't Go Full Issue

There are multiple reasons, browsers, plug-ins, flash players or unknown errors which may result in fullscreen not working of YouTube videos. Here, we roundup most common solutions to solve YouTube videos not going fullscreen problem.

Update Browser to Fix YouTube Fullscreen Problem

1. Update Browser & Flash Player to Latest Version

No matter which browser you use right now, we suggest you to update it to the latest version with the support of HTML5 player to avoid fullscreen problem when playing HTML5 video on YouTube. You can open to confirm that "HTMLVideoElement" and "The HML5 player is currently used when possible" options are checked.

Apart from browsers, Flash Player may cause various YouTube playback problems as well. It's better to keep Flash Player for Chrome, Firefox and other browsers up-to-date. Visit and follow instruction to download and install the newest Flash Player version. After all is done, please restart your browser and play YouTube videos in fullscreen mode again.

Disable Browser Extensions to Fix YouTube Fullscreen Problem

2. Disable Browser Extensions

You may install several extensions for browsers to achieve some tasks, for example AdBlock to remove YouTube ads, Video DownloaderHelper to save YouTube videos, or YouTube to MP3 plug-ins. All those tools probably cause YouTube fullscreen not working problem. Disable them or all your installed extensions.

Input "Chrome:extensions" on address bar for Chrome or "about:addons" for FireFox. Hit enter to get full lists of plug-ins. Uncheck "Enable" for Chrome or click "Disable" for Firefox to eliminate their interruptions on YouTube video fullscreen playback.

3. Download YouTube Videos

If you have tried the above two ways but YouTube fullscreen is still not working, we can suppose that fullscreen is disabled for a YouTube video (especially embedded ones on other sites) by owner. Therefore, the best way to make any YouTube video play in fullscreen is to download YouTube videos to computer or devices and use a video player to reach fullscreen playback.

WinX YouTube Downloader a well-reviewed video downloader, features free downloading all types of video (movies, TV shows, music videos, sports, news etc.) from YouTube and other 300+ sites at 5-8x real-time download speed. It can get videos in diverse qualities, 8K/4K/(1080P) HD/SD/3D off online while keeping original images and hi-fi audios. It is a 100% free and clean program bundled no adware, spyware or virus.

Download YouTube Videos to Fix YouTube Fullscreen Problem

Download and install WinX YouTube Downloader on your PC (compatible with Windows 10/8/7/Vista/XP). Next, follow the steps to download YouTube videos to fix YouTube fullscreen not working error during online playback.

Step 1. Launch WinX YouTube Downloader and hit +link-shaped button on navigation bar. Copy and paste URL of the YouTube video which won't go fullscreen to address bar of pop-up window.

Step 2. Hit Analyze button to load video information, including title, duration and output options varying from resolution, format, size and code. Select one option and click OK.

Step 3. Hit Browse button to set a target folder and click Download to start saving the YouTube video to computer. After that, you can open the video via video player software and play it with fullscreen mode.

See also: YouTube/YouTube App Not Working, Fix YouTube Crash Error

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