Here's what YouTube's TOS states specifically: However, downloading videos is legal for personal use or under the fair use provision in most countries. YouTube specifies in their Terms of Service that you shouldn't download content by any other means than their download-button. YouTube was also fined $136 million for collecting personal data without consent. They've previously faced lawsuits in the UK for running highly targeted ads to 'influence vulnerable young minds'. YouTube has a spotty track record when it comes to privacy. When you watch a YouTube video, both the owner and YouTube can access information regarding what parts of the video you watched, on what device you watched it, and tie this information to your account if you're logged in.

For privacy protection, you may want to download a YouTube video rather than watching it.

In case you don't have access to YouTube Red, downloading videos is one way to avoid interruptions during video playback due to advertisements.

This way, you don't have to pay for an expensive subscription for a file hosting or file transfer service such as WeTransfer, Dropbox, Google Drive, etc.

If you'd like to share a big video with friends or family, you could upload it to YouTube and recommend that they download it using Viddly.

As a content creator, then you'll likely want to use clips of other people's YouTube videos at some point.

If you have an iPod or a multimedia player that's not compatible with YouTube, then you're best off first converting the videos to MP4 or the music to MP3.

Not all devices support the YouTube app.

If you'd like to watch YouTube content while flying or traveling, downloading YouTube videos is your best bet to avoid buffering or interruptions! When traveling, you may encounter low-bandwidth networks or no Internet connection at all.

By saving a backup of the video locally, you ensure that you'll always have access. The owner may remove the video at any point in time, which happens a lot more frequently than you might expect.There are many potential reasons to convert YouTube videos to MP3 or MP4 format and store them on your local hard drive.

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