DD is a raster image format used by Commodore 64 computers. DD files are created with a drawing application "Doodle!" and can be opened on modern systems using XnView image viewer.

DD files use no compression whatsoever. Archived DD images are saved as files with JJ extension. DD files created on C64 computer should not be confused with similar files created with Atari Doodle application. DD files can be identified by their distinct size (9216, 9026 or 9346 bytes).