1804 Krita Document Format Image (Raster) Krita is a free raster graphics editor. Krita's native document format is Krita Document (.kra), which is loosely based on the Open Document standard. The format is used for handling layered raster based graphics. 1 Digital Preservation Department / The National Archives 22 Mar 2017 This format can be identified via a container signature in DROID version 6 or later. The PRONOM database cannot currently represent container signatures. 22 Mar 2017 application/x-krita MIME fmt/999 PUID kra File extension