If you work with PDF documents and need to annotate them, this article provides a list of 20 free PDF tools that can help you annotate your PDF documents quickly and easily. The tools include UPDF, Sejda, PDFsam Basic, LibreOffice Draw, Xodo PDF Reader & Editor, Skim, Okular, Adobe Reader, PDF-Notes free for iPad, UPAD Lite, Mendeley, PDF Max, PDFescape, Foxit, Nitro PDF Reader, PDF-XChange Editor, Preview (Mac), Master PDF Editor, MuPDF, and Kami PDF Editor. These tools offer various annotation features such as highlighting, underlining, adding comments, drawing shapes, and signing documents electronically.
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