Unfortunately, since there’s no official support for watermarks in Google Docs, you first need to create a watermark. Watermarks are essential for protecting your documents from copying or usage without your permission.
But even without official support, you can still add a watermark in Google Docs. However, you may want to add a watermark to your documents from time to time. For example, watermarking is a unique feature that is not yet officially available in Google Docs. Over the years, it has grown powerful, but it still doesn’t match the robustness of Microsoft’s Office suite in every way. Google Docs is a free product from Google for creating documents.