These are a few online tools to convert and download videos in desired format.
They allow conversion of uploaded files, a file from a remote URL or files hosted on famous video hosts like youtube,dailymotion.
http://www.mediaconverter.org/
http://www.onlinevideoconverter.com/
http://www.zamzar.com/
http://www.convertfiles.com/
http://beta.mux.am/
http://vixy.net/
http://www.videocodezone.com/conversion.php
http://www.convertdirect.com/
http://online.movavi.com/
http://www.flvix.com/
http://www.all2convert.com/
http://converttube.com/
