# Eraser

### Eraser

Select the Eraser tool, and click anywhere you want to erase.

The eraser size is directly related to the grid size. Try temporarily changing the grid [Units](/really-sketch/options/units.md) if you want to make the eraser bigger.

![](/files/-M6rU-yhVqC8aDePnZ6y)

### Undo

The Undo button may be a better option in many cases. It will undo the last thing that was drawn. You can use it repeatedly to undo more than one thing.

![](/files/-M6rUYj_Z3dif7dg4yN1)


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://chrispalmeri.gitbook.io/really-sketch/tools/eraser.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.