The problem with working with PDFs as text - even in emacs - is that they are often compressed and otherwise unreadable. Of course, like most things in Linux, you can also use the command line. There are a few dedicated non-free editors out there and at least one open-source PDF-specific editor. So if you don’t mind working inside the PDF format - very much like PostScript - you can do your editing in emacs or even another text editor. After all, most of the PDF file format is text and emacs can even handle binary files. You can use Control+C Control+C to switch to view a text representation. Unsurprisingly, emacs can display a PDF file if it is running under X.

For example, Okular’s review mode can add annotations like highlights and freehand lines. Both of these tools can’t really edit the file but can import them as images that you can further manipulate.

Other options include Scribus and Okular. If you don’t mind using a Web-based tool, PDFEscape is free and works very well. It largely depends on how the creator made the PDF to begin with. Sometimes text isn’t even text at all, but images. Changing something that causes a line to wrap will require you to change all the other lines to match. For example, columns of text will probably turn into a collection of discrete lines. The biggest problem is that most of these tools deal with the PDF as an image or, at least, a collection of objects. If all you want to do is remove something with a white box or make an annotation, these tools are usually great, but for more complicated changes, or pixel-perfect output, they may not be the right tool. Anything will work for this: LibreOffice Draw, Inkscape, or even GIMP. You can use lots of tools to edit PDF files, but the trick is how good the results will look. But what about editing them? Turns out, that’s easy, too, if you know how. Sure, there are other competing formats but they hold a sliver of market share compared to PDF. Hardly a day goes by that you don’t see some kind of PDF document come across your computer screen. But PostScript also spawned the Portable Document Format or PDF and that has been crazy successful. While PostScript printers are still a thing, there are many other ways to send data to a printer. PostScript started out as a programming language for printers.

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