Another problem many people run into with not downloading videos is that they often forget how they got there in the first place. You might forget the title or who posted the video or even some of the key features. That makes it difficult to find the video again in the future. When it comes to downloading those videos, however, you won’t have to worry about that because you’ll have the videos you like to watch available right there. You won’t have to worry about how you’re going to track it down later on because you’ll have it in whatever folder you want with a name that means something to you.
Ororsoft Youtube TV is unique software which turns your PC to customizable internet TV, bringing the best of Youtube videos to your desktop. With the channel filter feature and other useful search options you can easily find the videos you look for and play them live or download to your hard drive. The intuitive interface makes this a perfect tool for both new and experienced users - you can initiate a batch download of selected videos or watch these in live mode without having to download. Features: Youtube TV - play youtube videos from your playlist with high quality. Get the playlist searching for best ranked videos matching typed keyword or compose it by manually choosing the films. All items can be played in full screen mode with auto advance feature. Flexible search - with options to search by categories or sort by view counts, ratings and publish date. You won't need to open your browser any more to find the videos you are interested in. Filter results by channel - Search only in your favorite channels, this feature will greatly increase the effectiveness of your searches. Download or play all the videos from your favorite channels. Use this feature to backup your content of your own channel on youtube. Favorite Channel Manager - maintain the collection of your favorite channels using the predefined list of best channels in youtube category. Easy view and Quick Select modes - two modes optimized for better comfort. In "Quick select" mode you can quickly add videos to the playlist. Switch to "Easy view" mode if you prefer to see the detailed information. Download Manager - Save all your preferred videos to your hard drive by a single click. Video conversion - automatically convert videos to MPG, AVI, MP3, MOV and many other video formats. Video Player - play your downloaded videos by a simple double click, without a need for special programs or codecs.

That said, with Android it is possible to install apps without going through Google. The latest is InsTube – Free Video and Music Downloader just for Android—you can only get it at InsTube's site. You download the APK (Android application package) file to sideload on an Android device. Find it in your device's downloads and click it to install. (You may have to go into your security settings and enable "Unknown sources.") There is a similar side-load app from YTD.
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Using a strong password is a good way to protect your YouTube channel and Google account, but it's often not enough. The best way to secure your YouTube and Google account from hackers is to use Google's 2-Step Verification, which utilizes something you know (your password) and something you have (your phone). To login to your account, you'll need to enter both your password and a temporary code that Google sends you via text message or voice call on the phone. I highly recommend you enable 2-Step Verification for your Google account. Here's a step-by-step tutorial on how to enable and setup 2-Step Verification on your Google account and YouTube channel.
When you copy a YouTube URL (even for a playlist), click in the WinX software to launch. You start with the "analyzer," which checks all the options. This tool also tried to default to the 1,920-by-1,080 version in MP4; I picked the 4K version (3,840 by 2,160 pixels) in WebM format, a subset of the MKV format—you can rename a .webm file to a .mkv and it'll work fine. In settings there are options to default to WebM at highest res. You can set up a number of videos to back up before you even click the download button. The 4K 575.4MB file took 1 minute and 39 seconds to download, more than double that of 4K Video Downloader.
Totally free, 5KPlayer from DearMob is a media-playing utility that is a lot more than a downloader—but it's got a heck of a downloader integrated. Promising no viruses, ads, or plug-in requirements is a good start. It is, sadly, one of the few I tested that asks for a registration of your name and email—you have to do that to get the full download function across 300+ sites. You may still use it if you don't register; I didn't and was able to download 4K vids from YouTube.