Best of all, PDFpen lets you flatten a PDF and merge it with other PDFs, preserving all the changes you’ve made. Its biggest superpower is a rich editing toolkit enabling you to redact sensitive info in PDFs, add signatures, attach notes and comments, etc. PDFpen is a full-featured PDF editor with OCR support. But if your document contains any scripts, annotations, or custom changes, you will have trouble saving it. If all you need is to insert a page from another PDF or merge small files, Apple’s native utility won’t let you down. No judgment, Preview is still a stunning tool to apply basic changes. Let’s explore all the ways to combine PDFs on Mac to cover your particular scenario. These and other issues might force you to search for better options.
Preview doesn’t cover flattening and makes your system slow down if you merge large files. To combine PDF files while saving your edits might be a huge problem.
