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Ziyue GaoZiyue 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
You can do this using HTML tags to specify a background image. Check out this blog post (not mine) for more information:
Ziyue GaoZiyue Gao
Thank you very much for your help, but my PDF is on a server, I can only get its URL, to embed the watermark according to the URL to it
sophian smithssophian smiths
Use this PDF Watermark Tool you need to third party software 
For windows OS you can use fast and easy solution