Although you could use a free online video downloader, these sites are often not the most reliable and you might run into technical issues while trying to download content. If you’re a Mac user then VideoDuke is your best option for Mac video download. It’s a reliable video downloader that knows how to download videos. VideoDuke lets you download videos from most popular video sharing sites - and you can get started by downloading two videos for free in demo mode before deciding to purchase the full version.