Online Convert - Convert files like images, video, documents, audio and more to other formats with this free and fast online converter.
FileInfo.com - FileInfo is the central file extensions registry and contains a database of over 10,000 file types.
Zamzar - Free conversion online of many type of documents (images, text, video, audio...
File-Extensions.org - Large computer file extension library with detailed explanation of each file type with links to download free or associated software programs.
Convertio - File Conversion in the Cloud
FILExt - Open, view and convert files online