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Ziyue Gao
add watermark into PDF
Have already upload a PDF file to Salesforce, added a link in the custom page, click on the link to download the PDF file, at the same time the login name in the form of watermark is added to the PDF, my problem is I don't know how to add watermark into PDF
Please go through the following link which gives a sample code you can test in your org to create a watermark on PDF generated by a VF :
http://www.opfocus.com/blog/how-to-watermark-a-visualforce-pdf/
I too got a PDF watermark for Mac software but as you said that you got the file on server so it won’t be helpful to you. But if you got a PDF document and wish to add text or image watermark on it then go with this tool. Sorry for not being helpful