Open the pdfs in separate preview windows, show the sidebar/thumbnails, highlight all. Right now, my strategy is to print them and scan them into one file. If you're afraid of privacy related issues or if anybody at i love pdfmight steal your content, then you should check out big pdf converter — they don't have access to your files.
If you have a mac or have access to a mac, you can do this for free in preview. Is there a way to combine multiple pdf files into one from a computer desktop? I love pdf this is dumb and i don’t know if i can ask questions here but yesterday i was in a hurry and i decided to use i love pdf to put an image of my handwritten signature.