Sometimes, it can be useful to download videos from online video sharing services if we want to show them at a time when we don't have an Internet connection or the service is blocked by a firewall, for example, in a school. There are some online tools that make this download easy. With KeepVid (http://keepvid.com), we can download and convert videos from several video services on the Web, without installing any kind of software.

With this online tool we can directly download the video in the MPEG-4 format. In this case, we just need to provide the URL and click on the DOWNLOAD button.

If we are using the Mozilla Firefox browser, there's a very practical tool in KeepVid, called the Bookmarklet, that we can drag onto the Firefox bookmarks toolbar.

When we are watching a video and want to download it, we just need to click on this bookmark and the download links will be automatically created and presented to us.

To download the video, we just need to right-click on the download link and choose the Save link as… option.