This will add an & [Picture] code to the header. Simply click anywhere on the sheet and your watermark image will appear in the workbook. Now, if you want to put the watermark image at the centre ...

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.

How to Create an Image of an Excel Spreadsheet. Screen-capturing programs such as the Windows Snipping tool are fine for capturing graphics you see on your screen's visible area.

You can insert or add Header and Footer in Excel spreadsheet using this tutorial. Insert page number, current date and time, etc.