Apple Preview (macOS)

Apple Preview is the built-in, free PDF viewer and editor included with every Mac. Often underestimated, it is a remarkably capable tool for basic to intermediate PDF tasks, particularly annotation and form filling. It allows users to highlight, strike through, underline text, add notes, shapes, and arrows with ease. Its signature feature, using the Mac's camera or Trackpad to capture and place a handwritten signature, is simple and effective for basic signing needs.

Preview can also combine PDFs, reorder pages, and apply basic password security. Its performance is excellent due to its native integration with macOS. While it lacks true text editing (you cannot edit a paragraph of existing text), OCR, and advanced form creation, it handles a vast majority of what casual users and students need. For Mac users, it's the first and often only PDF tool required, offering exceptional value and convenience.