How to flatten AutoCAD drawing to remove the Z axis (for AutoCAD and LT)

It seems like for almost no reason some AutoCAD drawings made on flat 2D plane develops lines, polylines and other features along Z axis.

Like the image shown here.

To fix this problem and to flatten AutoCAD drawing you can use the methods explained in this article.

These methods work for AutoCAD as well as AutoCAD LT.

If you prefer the video version of this article then here it is, but if you prefer the article then read on.

Flattening drawing in AutoCAD or AutoCAD LT

This method works for AutoCAD as well as AutoCAD LT.

This method involves moving all objects in the drawing to infinity along the Z axis and then moving them back again to XY plane.

While this method may seem unconventional, it is the only one available if you are using AutoCAD LT.

First, select all objects from your drawing that you want to flatten, then use the MOVE command (M or MOVE) and specify a base point for the move operation.

In this case, click on any point (preferably lower left corner of the drawing) and then move the drawing to origin by typing the coordinates 0,0,0 on the command line.

Select all the objects of your drawing again and select the MOVE command again.

Specify the same base point (lower left corner) for the move operation, and then type 0,0,1e99 and press enter key.

This will move your entire drawing to infinity along Z axis.

Here 0,0 is the coordinate of X and Y axis but 1e99 is 1×10^99 which is essentially 1 followed by 99 zeroes.

In AutoCAD, the concept of using “∞” (infinity) as a coordinate is not directly supported so you can use 1e99 as a workaround.

Now we will move the entire drawing again back to XY plane.

For that double click your middle mouse wheel and the entire drawing will show up.

Select the drawing then type M for move command and press enter key.

Now select the lower left corner as the base point again and then type 0,0,-1e99 as the point where you want to move the entire object and press enter key again.

Now your drawing is back again at flat XY plane but this small process will eliminate any extensions along Z axis and your drawing will be completely flat.