For maximum privacy and control, you need to self-host any available open-source PDF editors on your own server.

Consider PDF Reader Options Before you open a PDF file, know that you have both native and alternative PDF reader applications to choose from. Here are a few popular choices to consider: ...

Press "Alt-F2" to open a command line prompt within Unity. Type the command for Evince with your PDF file's name, file extension and its full path relative to the Home directory.

PDF Files will not open in Internet Explorer 1. Press Windows Key + R combination, type put Regedt32.exe in Run dialog box and hit Enter to open the Registry Editor.

Q: Sometimes when I try to open a file or e-mail I get the message: "The selected file has an extension (PDF) that is not recognized by Windows Media Player but the player may be able to play it.

As such, it could open a PDF file as long as the %PDF-header started within the first 1024 bytes of the file. There’s, however, a change in the scheme of things now.

It is said that it can open files in a wide range of formats, including DjVu, XPS , which is similar to PDF, and CHM , which is a Windows help file, so I actually tried using it to see what kind ...

However, as mentioned, it's not a dedicated PDF editor and can't open PDF files as an editable document in a word processing sense. It can also struggle with complex layouts and fonts.