What Is a LISP Files for AutoCAD?

A LISP file, also known as a LISP program, is a text file that contains a series of instructions written in the LISP programming language. In the context of AutoCAD, LISP files are used to customize and automate various tasks within the software.

Understanding LISP Files

LISP (List Processing) is a high-level programming language that was developed in the late 1950s. It is known for its powerful capabilities in manipulating lists and symbols, making it widely used in the field of artificial intelligence and computer science.

In AutoCAD, LISP files can be used to extend the functionality of the software by creating custom commands or automating repetitive tasks. These files are written using plain text editors and have a .lsp file extension.

Creating and Loading LISP Files

To create a new LISP file, simply open any text editor such as Notepad or Notepad++ and start writing your code. Make sure to save the file with a .lsp extension to indicate that it is a LISP program.

Once you have written your LISP code, you can load it into AutoCAD using the “Appload” command. This command allows you to browse and select the desired LISP file from your computer. Alternatively, you can use the “Drag & Drop” method by dragging and dropping the LISP file directly into AutoCAD’s drawing area.

Using LISP Files in AutoCAD

LISP files offer immense flexibility and customization options within AutoCAD. They allow users to create their own commands, automate repetitive tasks, or enhance existing features of AutoCAD.

  • Create Custom Commands: By writing specific functions in your LISP code, you can define custom commands that perform a series of actions when executed. These commands can be assigned to keyboard shortcuts or toolbar buttons, making them easily accessible.
  • Automate Repetitive Tasks: LISP files can automate repetitive tasks by defining functions that perform a sequence of actions.

    For example, you can create a LISP program to automatically insert a block at specific coordinates or generate complex geometries based on certain parameters.

  • Enhance Existing Features: LISP files can be used to enhance existing features of AutoCAD by adding additional functionality. For instance, you can create a LISP program that extends the capabilities of the “Hatch” command or modifies the behavior of certain tools.


LISP files are a powerful tool for customizing and automating tasks within AutoCAD. By writing LISP programs, users can extend the software’s functionality and streamline their workflow. Whether it’s creating custom commands, automating repetitive tasks, or enhancing existing features, LISP files offer endless possibilities for customization in AutoCAD.