Simple functions If it is simple to sign, tag and add text to a pdf, you can use the "Preview" that comes with your Mac, double-click the pdf to open it, and find the pen icon in the toolbar, as shown below:

You can trigger the function of free graffiti, you can sign, and you can also see the functions of other toolbars.

Complex editing functions If you need complex pdf editing functions, such as text editing, adding and deleting pictures, and converting ORC pictures into text, you can use professional mac pdf editing software, such as:

Adobe Acrobat Pro DC

PDF expert?

Wondershare PDFelement Pro for mac

Among them? Adobe Acrobat Pro DC has complete functions, but it is relatively large. The other two softwares are small and practical.