Add a watermark in Excel
https://support.office.com/en-us/article/Add-a-watermark-in-Excel-A372182A-D733-484E-825C-18DDF3EDF009
1Select Insert > Header & Footer. 2Tap on the header and on the Header & Footer tab on the ribbon, click Picture. 3Select one of the available options to insert your image. In the header, you'll see & [Picture]. 4Tap anywhere outside the header to see the watermark.
1Select Insert > Header & Footer.
2Tap on the header and on the Header & Footer tab on the ribbon, click Picture.
3Select one of the available options to insert your image. In the header, you'll see & [Picture].
4Tap anywhere outside the header to see the watermark.
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