File format The format in which data is stored in a file. Data can be stored in files in different file formats. For example, Word normally stores a document in "Word" file format, which includes the text and all the formatting applied to the document. A file can also be saved in "Text-Only" file format, where the text is saved but without any formatting; in "Text Only with Line Breaks" format; or in "Rich Text Format" (RTF). Use the File Save As command to save a document in a file format other than Word file format. See also: File; Import.