Open the Excel document needing a signature if it's not open already. Then open the "Sign" dialog box by either double-clicking the signature line or by right-clicking it and selecting "Sign." Add ...

Learn how to create, add or remove the digital signatures in the Microsoft Excel files. You will first need to have a signing certificate.

Add a layer of security with a signature line in any Word, Excel and PowerPoint document, or record your own digital signature in a document that includes a signature line.