Q1: What is the best way to add watermark to PDF for me?
There are two types of add watermark to PDF to choose from: online and offline. The online to insert watermark to PDF does not require the installation of task software, as long as you have internet access. But the offline version needs to download and install the software in order to work.
Q2: How to insert watermark to PDF on mac?
You don't need to install the task software. You can add watermark to PDF online, just use the browser that comes with your system.