The most successful website of the decade YouTube is the biggest search engine for any video.
We often needs videos to view from YouTube and there are basically two ways to download videos, either via a web app or via a desktop application.
Personally, I like the web applications better simply because you don’t have to clutter up and slow down your computer with all kinds of software!
You may use proxy websites to access YouTube but, here in this post I have created a list of 14 websites to Download YouTube videos.
We wrote one more post where you can download YouTube videos in 3GP format directly.
Keepvid
On this site you will gain access to the possibility of downloading all kinds of videos from different sites such as YouTube, Google, iFilms and more. Once you have downloaded the video of you preference from the web page you also have the possibility of converting that file into other formats.
Video Download X
On this site you will find a software that will allow you to download and save YouTube videos. The home page of this website allows you to use this online software by pasting the video URL into a determinate field for downloading, converting or sharing with your friends any video you want.
Keep-Tube
Download high quality videos from Vimeo, HD Youtube videos and other top social media and video websites.
FlashVideoDownloader
Flash Video Downloader helps you to download embedded flash video from YouTube-like video sharing websites with no download link available.
Clip Nabber
Next time you come across a YouTube video that you want to save in your HD for posterity, a site like ClipNabber will let you have your way. At its most basic level, the site will enable you to cut and paste the URL of the video that you are keen on and then proceed to download it to your HD.
Media Converter
It is a free audio and video converter. It requires you to signup to access the features like downloading videos from Youtube and other websites. It only supports top 5 video sharing websites you can download videos from.
Clip converter
This is one of free online tool to convert and download videos. Clip converter
allows you to convert them into your favorite format. To get more information, simply browse the link.
Airy
It is an individual popular site for downloading youtube videos directly. 
Airy is one click & easy to use site with a wide range of formats.
Softornio
Softornio is an exclusive featured website which is especially designed 
for converting videos in support of iPad, iPhone or other Mac platforms.
VD youtube
This is a web service which allows you to download videos, audios 
from youtube and other popular sites. It provides the quality from low to high and wide range of formats.
Savevideo
This site will help you to download youtube videos. The services of 
Savevideo are completely free. Additionally, it support to various formats.
Savefrom
Savefrom is a source of downloading and save the videos from youtube. It 
supports to all possible qualities and formats. To download it now, browse the link.
Zamzar
Zamzar is an amazing video downloading site where you can download a 
couple of latest vidoes. It converts all types of files and send them through E-mail to download. To get more information, browse the above link.
Tubemate
Last but not the least; Tubemate is one of the best options to download youtube videos. Tube mate is easy to use video downloader and it is compatible to all devices.
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good collection of sites,but i myself prefer it has better search options and also downloading format options.
P.S:- I dont own the site