How to free download YouTube HD video?

“YouTube Downloader HD is software to free download YouTube high definition videos. While normal YouTube videos have a picture resolution of 320 x 240, high quality MP4 videos have a picture resolution of 480 x 320 and YouTube HD videos have a picture resolution of 1280 x 720 (720p). The video bit rate is 200 Kbps, 512 kbps and 1024 Kbps respectively. The video codec is flash for normal videos and h.264 (iPod compatible) for high quality and high-definition YouTube videos. Likewise audio codec is MP3 for normal videos and AAC for high quality and HD videos.”

From Wikipedia.com

Do you want to convert FLV to AVI with YouTube downloader? YouTube Downloader can do what you haven’t achieved before, especially download YouTube HD video.
Part1: Free download YouTube HD video under win OS X

If you want to download YouTube HD video under Win OS X, Free YouTube Downloader will help you greatly.

http://download.huludownloader.com/free-youtube-downloader_full384.exe

But if you want to enjoy those HD YouTube video to iPod, iPod Touch, you need to use YouTube Downloader, which has 30-days for trial. Besides download FLV to AVI, it can also convert those downloaded files to other popular formats like WMV, M4V, MOV…

A tutorial on how to download and put YouTube HD video to iPod, iPhone.

 

Part2: Free download YouTube HD video for Max OS X

• Free Download YouTube HD Video with Safari Browser

Everything that is visible to eyes is downloadable and for Safari web browser, all files can be spotted inside Activity Monitor. So we can download YouTube HD videos with Activity Monitor now.
Amongst all of files listed inside, there exists a file linking to the HD Video. To spot and download it, follow these steps.
Step 1: Open YouTube URL to video. Append URL with &fmt=18 to view HD video
Step 2: Show up Activity Monitor (Command-Option-A)
Step 3: Seek for file with largest size and Option-Click it
Step 4: The download should be started with default name video.mp4

• Free Download YouTube HD Video with Firefox Browser

 

For Firefox users, HD YouTube video is downloadable using bookmarklet. Just drop the bookmarklet on Bookmark Bar and click on it when you are opening YouTube page. New link will appear afterwards.
Bookmarklet to Download YouTube HD
Here is the bookmarklet: YouTube HD
Drag it to your Bookmarks Bar and it will look like screenshot below.