Merging multiple PDF documents into a single document usually requires you to use an external app or an online service, but you can do it with your system's built-in Preview app if you have a Mac.

Pranay Parab is an independent tech journalist based in Mumbai, India. He covers tech for Lifehacker, and specializes in tutorials and in-depth features. Ever wanted to merge a few different PDF files ...

Working with PDFs on your Mac can really suck. Even just adding your signature to a PDF document can be an ordeal. Luckily, there’s a great Mac app that can simplify the experience of PDF signing, ...