By default, all software supports multiple file extensions. TextEdit supports at least 178 different file extensions. The basic files that TextEdit supports are .JSON. However, not all of the extensions listed on the list are always used to save the effects of work in TextEdit. Very often, files with such extensions are used as source data files used by TextEdit.
TextEdit can be used to convert file formats between the file extensions listed below. You can open a file with one of the file extensions below via TextEdit and try to save it in another file format, also supported by TextEdit.