Windows macOS Your handwritten signature gives your document a personal touch. You can scan your signature and store it as a picture to insert in the document. You can also insert a signature line to indicate where a signature should be written. Create and insert a handwritten signature You need a scanner to do this. Write your signature on a piece of paper. Scan the page and save it on your computer in a common file format: .bmp, .gif, .jpg, or .png. For information on how to use your scanner, use the manufacturer's manual or Web site. ...