Add a Water mark to PDF when downloading or viewing PDF

You can't use Acrobat for this, as you're not allowed to run it on a server. This will require a back-end application that will add the watermark to the template file on-the-fly, and then server the customized version of it to the end-user.

I've developed some tools like this in the past, so if you're interested in hiring a professional to create it for you, feel free to contact me privately by clicking my user-name and then on the blue "Message" button.

Hi @eliud_5554 not sure what happened that your post moved back to the Enterprise forum. I've posted an answer above as this is an Acrobat related question, I've moved your post back to the Acrobat forum.

Acrobat has watermarking capabilities https://www.adobe.com/in/acrobat/roc/blog/step-by-step-guide-to-online-pdf-watermarking.html however if you intend to have the watermark added only if the PDF is downloaded - that would require a custom solution similar to this https://helpx.adobe.com/acrobat/kb/adding-watermark-pdf.html