The PDF, by its nature, is a read-only format. Yeah, you got the Ocr Pdf that allows you to modify it, etc.; and the Reader allows for some markup, but it was initially designed to be a global standard for read-only documents and/or digital forms that you can fill out. As such, people donât create documents in PDF â t create them in some other app (MS Word, Apple Pages, etc.) and then export them to PDF to be readable on any device. So what you need to do is add the watermark to your document in your designer app, and then export it to PDF together with the watermark. If you donât have access to the source document, only the PDF â then chances are you are not the creator of that PDF, so you donât really have any right to add a watermark to it. The above holds true for Mac, Windows, Linux, etc.
After the jump. The easiest way is to just download the free and open Source file, rename it to something like 'Hint.pdf', which means your document can be read by any app or website and the watermark will be preserved. And if you do not want to leave the source files, make sure you can view and print them directly from your computer, or email them to your friends! And if you are a bit geeky, here are a few more interesting things you can do with PDFs: 1. Print it: PDFs can be printed from the app. 2. Make a PDF slideshow: Here's the code for a PDF slideshow maker. 3. Create a simple, user-friendly, and simple-to-understand PDF, e.g., a school report / teacher notes, or some other documents you can easily manipulate with your phone or desktop (I created this one, but there are a bunch of others here on the net). 4. Scan-and-email.