What is Zamzar.com? Their company mission says it all:
“To provide high quality file conversion for as many file formats as possible.“
The interesting thing is that they are able to provide file conversion services without having to install any application on your computer. All you basically need to do is specify the source file, select the destination format, and provide an email address so that they can email you a download link for the converted file.
Their main strength is the wide range of files they can convert. It is pretty comprehensive! That is why I mention that their service is the “mother of all online file conversion” services. You can convert video, image, audio, and CAD files just to name a few of the major ones.
On top of that, you can even take a Youtube or some other online video content provided you have the video URL, and download a copy of it to your computer!
There is a limit of 100MB for the free account. You don’t even have to register to get the conversion services. However, if 100MB is too small for you, you can purchase their service for a price. Go to their pricing page for the latest pricing information.
For the free service, you get no online storage and you only get 5 concurrent file conversions at a time. As for support, response time is only best effort.
Bottom line though, even the free version is a great deal since most people will only want to convert some files once in a while.