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Luckily, there are a lot of different PDF apps available, which allow all sorts of additional functions and features to be opened up. This includes the ability to edit PDF files, which can be invaluable for users. Other features might include the ability to annotate PDF files as well as print them out, or even insert forms and similar for really user-interactive PDF files
PDF Viewer Pro is a fast and beautiful app, allowing you to view, search, and annotate PDF documents with ease on your Mac.VIEW DOCUMENTS ON YOUR MAC• Open files from the Finder. Supports Drag & Drop.• Search for the exact text you are looking for within the document.• Annotate images (JPEG, PNG) non-destructive, just like PDF documents. (PRO)ANNOTATE WITH EASE• Highlight and markup text while reviewing a document.• Leave comments by adding a note, text, or drawing directly on the PDF.• Add images or audio
– MakeUseOf“The best app for managing, editing, and reading PDFs on your iPad”. EDIT ORIGINAL PDF TEXT• Edit or modify existing text. The font, size, and opacity of the original text are automatically detected, so you can make edits easily.ADD AND EDIT IMAGES• Easily add, replace and resize images in your PDFs