Zamzar is a web application to convert files. It allows user to convert files without downloading a software tool. Users can type in a URL or upload one or more files (if they are all of the same format) from their computer and hit convert button, Zamzar then converts the file(s) to another format, After that, you wait for an email from Zamzar with a link to your converted file. That's it!
ZamZar, offers free online file conversion and allows users to upload and convert the files upto 100 Mbs in one go. The files are kept on the servers of Zamzar for 24 hrs. and it sends you the link of the file for download on your specified email address. It is safe to submit your email address as well. It currently supports 5 image formats, 14 document formats, 11 video and 9 audio formats. This is a good list, however it will be nice to see the support of PNG format as well as it is one of the most used formats on the internet for images.