A document converter is a type of file converter that converts one type of document file format, such as PDF, XLSX, DOCX, TIF, or TXT, into another type. If you can't open or edit a document because you don't have a program that supports it, converters can help.

I prefer Zamzar for converting documents because it works online and supports many common word processing, spreadsheet, presentation and other document formats. A big plus is that it can convert files as large as 50 MB.

It also supports document to MP3 conversion, which means it functions as an online text to speech tool. Various image formats are also supported as output options for many types of files, as is the SWF video format.

Zamzar works with any operating system that supports a web browser, including all versions of Windows, Linux, and macOS. All you need to do is upload the file to the site from your computer, a URL, or a file storage site like Dropbox or OneDrive.