Editing utility

A checked version of this page, approved on 5 October 2022, was based on this revision.

DEU was the first fully-featured Doom level editor that appeared in 1994 as Doom's file formats were reverse engineered, and spawned a number of derivatives and imitators.

An editing utility, often called an editor, is a program that allows a user to create or modify portions of the games using or based on the Doom engine.

Doom is recognized as one of the earliest games to explicitly support the modification of the game for the extension of gameplay, through the use of arbitrary WAD files (PWADs). With all the technical information now known about the Doom games, Heretic and Hexen, it is possible to modify nearly anything and everything within the Doom environment. Some of the utilities that enable this are listed below.