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Using MS Excel, it is not possible to insert watermark. References: Using Essential XlsIO, a text or image watermark can be inserted as mentioned in the below workaround: To insert a text watermark, one can take the image of a watermark and insert in the worksheet as background. Image watermark can also inserted using the same method. Please refer to the codesnippet that illustrates this: C# // Set the image as sheet background sheet.PageSetup.BackgoundImage = new System.Drawing.Bitmap(@"image.png"); VB ' Set the image as sheet background sheet.PageSetup.BackgoundImage = New System.Drawing.Bitmap("image.png") Sample |