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[Fixed] YouTube Fullscreen Not Working on iPhone, iPad, Android, etc.

YouTube embeds a fullscreen option delivering a better view experience to watch videos on computer. It usually works well on browsers. But sometimes, YouTube won't go fullscreen properly on iPhone, iPad, Android, Mac, and various browsers. In this post, we have list 100% effective fixes to YouTube fullscreen not working problems on browsers, like Chrome, Firefox etc.? Read this article to get troubleshooting tips.

 YouTube won't go fullscreen error
YouTube Fullscreen Not Working

Free Download YouTube Videos and Play in Fullscreen

WinX YouTube Downloader - 100% FREE & SAFE YouTube video downloader! Free download SD/(1080P) HD/4K/8K/3D videos from YouTube and similar sites (300+) with high quality. Play YouTube videos in fullscreen on iPhone, iPad, Android, PC, Mac, etc. without trouble.

Fix 1 Update Browser & Flash Player to Latest Version

YouTube fullscreen not working on Safari, Chrome, Firefox, or Edge is a known error. No matter which browser you're using, 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.

Update Browser to Fix YouTube Fullscreen Problem
Update Browser to Fix YouTube Fullscreen Problem

Fix 2 Disable Browser Extensions

You may have installed several extensions for your browser to achieve some tasks. You may also use some YouTube-related extensions for certain purposes. For example, there are AdBlock to remove YouTube ads, Video DownloaderHelper to save YouTube videos, and YouTube to MP3 plug-ins. All those tools probably cause YouTube fullscreen not working problem. When your YouTube video won't go fullscreen properly, try to disable them or all your installed extensions.

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

Hot search: YouTube Shorts not showing up

Fix 3 Turn off Hardware Acceleration

While the Hardware Acceleration is designed to make things faster by using the computer's hardware, it can sometimes cause problems. In fact, there are users confirmed it's one of the culprit that cause YouTube not to go full screen. Anyway, it's worth trying this quick fix to YouTube fullscreen problem. Disabling hardware acceleration on Chrome, Firefox, Safari, other browers are quite the similar. For example, in Chrome:

  1. Launch Chrome, then select Menu and open the Settings.
  2. Scroll down the dropdown menu to the bottom and select the Advanced option.
  3. Scroll to the System and uncheck the Use hardware acceleration when available option. Then restart Chrome.
Disable hardware acceleration to Fix YouTube Fullscreen Problem
Disable hardware acceleration to Fix YouTube Fullscreen Problem

Fix 4 Clear Cookies and Cache

Don't forget to clear your browsing data, the cache, and the cookies regulary, as they will also cause YouTube fullscreen not working errors on iPhone, Android, Mac, PC, or other devices. To fix, simply clear the Cache and remove the Cookies from your browser or browser app.

To remove the Cookies from websites that cause problems:

  1. Open your browser/brower app and go to the Options/Preferences -> select Privacy & Security
  2. Find Cookies and Site Data -> Manage Data

To clear the Cache:

  1. Open your browser/brower app and go to the Options/Preferences -> select Privacy & Security
  2. Find Cookies and Site Data -> Clear Data -> Cached Web Content: Clear
clear browing data to Fix YouTube Fullscreen Problem
Clear browsing data to Fix YouTube Fullscreen Problem

Fix 5 Try YouTube Hotkey

If the YouTube won't go fullscreen with the full screen button, try the YouTube keyboard shortcut. The hotkey for  going full screen on Youtube is F (F11). This is reported to be useful for some users. Sometimes it works on the first try, sometimes on the third. Anyway, it's simple and worth a short. To activate YouTube full screen with your button, hit the F (F11) button on your keyboard enable full screen mode, and press escape to exit the full screen mode.

Ultimate Fix Free Download YouTube Videos to Go Fullscreen Offline

If the above fixes won't work and the YouTube fullscreen is still not working, there is an ultimate fix for you - download YouTube videos to iPhone, iPad, Android, computer or devices and play any YouTube videos in fullscreen mode. For this purpose, try:

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. Free download 8K/4K/(1080P) HD/SD/3D with original images and hi-fi audios. It is a 100% free and clean program bundled no adware, spyware or virus.

How to Free Download YouTube Videos in Clicks

Download and install the FREE 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.

download videos that won't go full screen from YouTube
Free Download YouTube Videos

Step 1. Launch the 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 downloading the YouTube video to computer. After that, you can open the video via video player software and play it with fullscreen mode.

Disclaimer: Digiarty Software does not advocate downloading or copying copyright content for any commercial purpose and suggests referring to the copyright laws in your countries before doing so.


author - Kistent Waung

Kistent Waung twitter icon

Graduated from Nanyang Technological University, Singapore, she employs herself in IT related content creation (since 2013) and happens to perfectly combine her major (computer & science) and her gusto (writing). She's seasoned at offering video audio conversion workarounds and always passionate about new trends, from hot HEVC, 4K to the new AV1 codec.

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