# Drawable canvas Drawable Canvas allows you to draw by free-hand on a runtime only (newly created) file-data source. Very useful for e.g. signatures. The "Value" property of the Drawable Canvas must be data-bound to a runtime only data source (file object class) with cardinality one. You must make sure the object in the data source has been populated. The drawing will be saved back to this data source, as an image, and you may save it (persist). {% hint style="info" %} A full example setup of Drawable Canvas is available in our [Showroom](https://showroom.appfarm.app/ui-components/drawable-canvas)! You may view a demo, as well as access the setup in Appfarm Create. If you do not have access, you may register [here](https://showroom.appfarm.app/sign-up). {% endhint %} --- # 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://docs.appfarm.io/library/ui-components/drawable-canvas.md?ask= ``` 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.