FileProInfo.com is the file information database of over 15,000+ file types, software, free online apps/tools, so tools, guest blogs, videos, and images.
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Zamzar - Free conversion online of many type of documents (images, text, video, audio...
Convertio - File Conversion in the Cloud
Free File Converter - Using Free File Convert you can convert your files into different formats.
File-Extensions.org - Large computer file extension library with detailed explanation of each file type with links to download free or associated software programs.
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.