A few free online format conversion tools that can do everything

Many times we need to convert files between different formats, such as converting doc to pdf, rmvb to 3gp, etc. These tasks usually require some conversion software. In most cases, these softwares are either not all-inclusive or they come with a price. Are there any free, no-installation-required, and multi-format-supported options? Yes! Online services have many advantages; sometimes online conversion is faster than downloading a conversion tool. This article introduces 3 free, all-inclusive online format conversion tools. These 3 services support almost all file formats.