Finding a low-cost program that can edit or add notes to a PDF file can be hard. Finding one that can collate all of the changes as well seems almost impossible. However, Skim For Mac might be able to solve your dilemma, as it allows users to place marks and notes into PDF files and save all of those adjustments separately as well.
Skim For Mac allows for a variety of marking and annotations to be inserted into PDF files. This free program includes movable text boxes for notes as well as highlighting, underscoring and strike-through functions. You can even change the color of the different editing marks and the notes. Hiding the marks can be done easily and can be undone just as quickly. Notes and marks can be saved as separate text files which can be useful for editing and studying. The program also allows for text searches within the PDF file. Extra tools are available to help with reading longer PDF files, including bookmarks and reading lines. The interface is easy to use but lacks a comprehensive toolbar, so you are forced to use the drop-down menus at times.
Overall, Skim For Mac seems to be a useful tool for annotating and editing PDF files with few limitations and many options. This program would be suitable for both students and personal use with editing, noting and reading PDF files.
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Skim is a PDF reader and note-taker for OS X. It is designed to help you read and annotate scientific papers in PDF, but is also great for viewing any PDF file.
- lots of options to annotate
- like that you can choose more than 5 colors (vs. preview)
- for those multi colored highlighter users this can get quite annoying, you cannot just select a color and then highlight. and then choose another color to highlight other areas. Instead you set a default highlight color and every time you want a section of document to be in another color you have to select that individual section and change the color (quite annoying for me as I use ~4 different colors, all mixed interchangeably in the same document, when highlighting to mean different things) - there's no way to mass edit your previous annotations (can't select multiple lines/highlights and change their color or move them to a different location in the document) you have to select each individual line and move/change it one by one (REALLY annoying for the "diagrams" I make to add in the side of the documents I edit)
useful for some people I'm sure, the options seem limitless, but the more you use it the more you realize how annoying little things are that should be simple. Like the fact that you can't select multiple annotations or that you have to click the object and then click the color you want for EVERY line. Tried to write a recommendation about fixing these features and got a seemingly rude response about my suggestion. Overall, I'm not very happy, so I'm on the search for something better.
1 Skim has by far the best annotation tools&management in the PDF reader/editor spectrum, and this is including the really pricey apps (My work involves a lot of pdf-reading, note-taking, annotation and form-filling, used to do it mostly on PDFPen Pro and still own the latter, but Skim has pretty much become my default reader/editor, unless I need abstruse PDF-creation functions. It is the ONLY mac app that allows dealing with annotations in bulk. Annotation/form filling capabilities have never given me any problem, and I filled a good deal of state/tax etc forms. 2 it is LIGHTNING fast, a lot faster than any of the contenders. 3 I don't know about earlier versions, but the versions I've used on Mac since mid-2013 have all been quite stable and reliable, more so than commercial alternatives 4 The interface though not stunning, it stays out of the way , various sidebars on either side of the screen can be used for practical reasons, or turned off with a click for full-screen reading
Doesn't have detailed PDF creation/bulk-editing tools, not a replacement, say, for pricey publishing-oriented software, but if your PDF-use revolves around reading and typical annotations, that won't be restrictive. All 'core' functions, like printing customization, or dictionary-integration, are there and work like a charm.
I've been using Skim since late 2013 , and in that period it was regularly updated and I never encountered any error, or problem with forms/annotations etc. I'm ever surprised by that Skim hasn't gone immensely popular already, as I can't think of a second software that I could recommend this easily (excepting, maybe, Pythonista on iOS)