How to Put a Signature on Microsoft Excel. Microsoft's Office programs have powerful options for creating and editing documents as well as protecting those documents.

You can add a signature to an Excel spreadsheet using electronic signature software or using the Insert feature in Excel. Open an Excel spreadsheet and select Insert > Add a Signature Line.

You may already know you can add a watermark to a Word document, but you might not know that you can also add a watermark to an Excel sheet. Here's how.

This screenshot guide shows you hwot to create, customize and insert a watermark in Microsoft Excel using two different methods.