Best YouTube Downloader

YouTube Downloader is a popular, free program that enables you to download and convert online videos (legal content, to which you have the rights) for later viewing on your desktop or mobile device. It can convert files to MOV, MP4, 3GP, WMV, AVI, or MP3.
The name "YouTube Downloader" is terribly misleading because the program, in fact, downloads a whole lot more than just YouTube videos. On the developer's site, you can find an extensive list of additional supported sites including Facebook and Vimeo. This wide net of support easily pushes YouTube Downloader to the top of its category.
When you find a video you'd like to download, copy the URL of the video page and open YouTube Downloader. From there, you'll notice that the program automatically pastes the URL into the appropriate field. Choose your desired Download quality (Best Available is a nice option) and your destination folder, then hit Download. Once your download is finished, hit the Play tab to watch. The Convert tab lets you export to a different file format for playing elsewhere, and gives you a convenient mini editor for making minor alterations before your export. You can change video volume (or remove audio altogether) and splice footage by setting specific start and end times.

One thing that disappointed us was the absence of a one-step download-and-convert function in the free version. If you want the one-step convenience, you'll have to upgrade to Pro ($19.90), which also gives you the capability of downloading multiple videos at once. Also, it would've been nice to be able to name files before downloading them, but that's certainly not a deal-breaker.
For online video enthusiasts looking to download non-copyrighted or personally owned videos, YouTube Downloader appears to be a near-perfect tool. Sure it's missing a few minor conveniences, but its simplicity and the fact that it casts such a wide net of support for online video sites make it virtually unbeatable.

The converter in YouTube Downloader is a bit slow but it's a nice add-on to have. One problem you may have is that when you've downloaded the clip, there may be no sound. This is easily remedied by downloading a codec which can be found on the developer's website.
YouTube Downloader's interface may feel a bit confusing at first, and the design could be improved a bit, but in any case the program works fine and does what it says on the tin.

YouTube Downloader allows you to download videos from YouTube, including HD and HQ videos, Facebook, Vevo, and dozens of other video sites and convert them to other video formats. The program is easy to use--just specify the URL for the video you want to download and click the Download button. The program also allows you to convert downloaded videos for iPad, iPod, iPhone, PSP, Cell Phone, Windows Media, XVid and MP3, or play video that you have previously downloaded or converted.

The YouTube Downloader interface includes a tabbed format for easy downloading, converting, and playing, and a new Activity tab allows you to keep track of multiple downloads and conversions in real time. The program has the ability to download full playlists as opposed to just one video. YouTube Downloader is available in English, Albanian, Arabic, Belarusian, Bulgarian, Chinese, Chinese Simplified, Croatian, Czech, Dutch, Estonian, Finnish, French, German, Greek, Hungarian, Italian, Kurdish, Norwegian, Polish, Portuguese, Romanian, Russian, Serbian, Spanish, Swedish, Turkish. A premium version ($19.90) will unlock enhanced features such as faster download times or multiple concurrent downloads.

What's new in this version: Version 3.6 allows you to convert files to upload on your iPad. If you have the PRO license, you can now select more videos to convert at the same time. We also support new languages: Albanian, Belarusian, Estonian, Kurdish, and Turkish.

Sure you can download  YouTube Downloader