Hi, there are several online platforms which allow adding text to pdf in the form of watermarks, as plain text or as an image. After trying several, I recommend you to use PDF escape (https://www.pdfescape.com/) which doesn't require downloading or subscription, and since you mentioned you are always using the same text, you can prepare it as a *.png file and insert it as an image. This is a very easy tool to use. I'm attaching the generated pdf with image. I've also tried PDFCandy, which is great if what you need is to add a watermark, but unlike PDF escape it doesn't allow to add images, only text. I'm attaching the generated pdf with watermark.