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Go to a YouTube, Dailymotion, or Clipfish video. Select the video's address. Copy the address. Open the Convert2MP3 website. Click the video link text field. Paste in your video's address. Click the mp3 ▼ box. Click mp4. Select a quality. Click Convert. Click Download.
In your browser, go to a video that you want to download from one of these sites. Click the address bar at the top of your browser to highlight the address. Press Ctrl+C (Windows) or ⌘ Command+C (Mac) to do so. Go to http://convert2mp3.net/en/ in your browser. While this website is based around creating audio (MP3) versions of YouTube, Dailymotion, and Clipfish videos, it can also convert videos from these sites into downloadable video (MP4) files. If this site opens in German and you prefer English, click the American flag icon in the upper-right side of the page. It's below the "Insert video link (URL) and select format" heading in the middle of the page. Press Ctrl+V (Windows) or ⌘ Command+V (Mac) to do so. You should see the address that you copied earlier appear in the text field. It's to the right of the text field. A drop-down menu will appear. You'll see this option in the mp3 ▼ drop-down menu. Doing so selects MP4 as your video's format. Click the drop-down box to the right of the "MP4 quality" line of text, then select the quality level in which you want to download the video. The quality that you select here can't be higher than the video's maximum quality. For example, you can't download a 720p video in 1080p. It's an orange button to the right of the file format. Doing so will generate an MP4 download link for the video. If clicking convert results in an error that says "pick another video" or "cannot be downloaded", Convert2MP3 is undergoing site maintenance. You'll most likely be able to use it again within 24 hours. This green button is in the middle of the page. Your video's MP4 file will begin downloading onto your computer, though you may be prompted to select a download location and click Save depending on your browser.