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The fastest way to download 4K and 8K Ultra HD videos from YouTube.

4K Ultra HD is becoming more and more popular. Most new mobile phones, computers, television sets, and other electronic devices support 4K Ultra HD. Many people have also had one or more devices that support 4K UHD video playback or recording.
4K Downloader is a simple Windows app for downloading and converting 4K and 8K Ultra HD videos from YouTube and other video streaming sites. It accelerates your downloads by up to 5 times.
Easy to use
Click "Add Download" button to download an online video. You can also directly drag and drop video link/URL from your browser to the Drop Box of 4K Downloader to add a download.
4K Downloader can download UHD 8K, 4K, QHD 2K, FHD 1080p, HD 720p, and 3D videos from YouTube if they are available.
4K Downloader allows you to download only audio stream from YouTube, without downloading the entire video file.

Speed up your downloads
4K Downloader features an advanced download acceleration engine that lets you download videos up to 5 times faster than normal speed.
4K Downloader allows you to pause, resume, and cancel downloads at anytime.
While downloading, you can click "Preview" button to play incomplete video and make sure it is really the video of your choice.

Convert and optimize videos
4K Downloader can automatically convert downloaded videos to any format and optimize them for your portable devices. It supports MP4, FLV, WMV, MOV, AVI, MPG, VOB, WEBM, DVD, VCD, and many other formats.
4K Downloader can extract audio stream from video, and save it as WAV, WMA, AC3, AAC, OGG, FLAC, MP2, or any other audio format.

iTunes compatible
Optionally, 4K Downloader can automatically add downloaded videos to your iTunes library, so you can easily synchronize your videos to your iPhone, iPad, iPod, etc.

4K Player
4K Downloader includes a simple media player for playing MP4, FLV, WebM, and any other format video/audio files that Windows Media Player cannot play.