# Undo a mistake

> Undo the last thing you did with Ctrl+Z or Undo, and do it again with Redo if you undid too much.

2 min · Updated 2026-11-11 · https://vcad.dk/en/help/undo-a-mistake

Once you are done, the drawing is as it was before you made the mistake. You can undo many steps, one at a time. One change is one step, even when it touches many objects, for example a delete or an import.

Every session has its own history, and it is saved in the browser. So you can still undo after you have been in another session, or when you open VCAD again in the same browser.

## Undo the last thing

1. Click **Undo** on the toolbar, the left of the two arrows just right of **Snap**, or press **Ctrl+Z**.

    ![The whole toolbar with the mouse on Undo just right of Snap, and below it the drawing, where the two kerb lines and the boundary line that had been deleted are back and ringed](https://vcad.dk/help/undo-a-mistake/undo-en.png)

    > If the cursor is in a field, for example in the **Properties** panel, **Ctrl+Z** only undoes what you typed in that field. Click **Undo** on the toolbar instead.

2. Click **Undo** again to undo the step before. Keep going until the drawing is the way you want it.

> **While you draw a line:** once you have placed two or more points with **3D Polyline**, **Ctrl+Z** removes the last point and you can keep drawing.

> On a Mac, press **Cmd** instead of **Ctrl**.

## Redo what you undid

1. If you undid too much, click **Redo**, the right of the two arrows, or press **Ctrl+Y**.

    ![The whole toolbar with the mouse on Redo, and below it the drawing, where the small building that had been undone is back and ringed](https://vcad.dk/help/undo-a-mistake/redo-en.png)

    > If you make a new change after undoing, you can no longer redo what you undid.

## If something doesn't work

| What you see | What to do |
| --- | --- |
| Ctrl+Z does nothing while you draw a line | You have only placed the first point. Press **Esc** to remove it. |
| A deleted session does not come back | A session you deleted with the cross on its tab cannot be undone. |
| **The undo history was cleared because a step in it could not be read. The drawing is unchanged.** | The earlier steps cannot be undone. Carry on working as normal. |

## Related guides

- [Delete objects](https://vcad.dk/en/help/delete-objects.md): Delete the objects you have selected with the Delete key or from the right-click menu.
- [Change an object's layer, color or linetype](https://vcad.dk/en/help/change-object-properties.md): Change the layer, color, linetype and elevation of one or many objects at once in the Properties panel.

Stuck? Write to us at info@vcad.dk