Uncompressed bitmap image created by the X Windows System, a visual application used to manage networked client-server computers; stores a screenshot, or "screen dump," of a background or window from the application's GUI; created by the xwd client process.

Different XWD files may contain different amounts of colors depending on the capabilities of the video card used to capture the image. XWD files may be very large in size since they are uncompressed. NOTE: Since X10 and X11 use slightly different XWD formats, some XWD files may not be compatible with certain image viewers.