Professional PDF tools without the cloud. 100% offline, native performance, and zero data collection. Your documents stay where they belong: on your device.




Skim is described as 'PDF viewer and annotation tool for macOS supports scientific paper reading, note-taking, highlighting, bookmarks, multiple annotation types, and AppleScript' and is a popular PDF Reader in the office & productivity category. There are more than 50 alternatives to Skim for a variety of platforms, including Windows, Mac, Linux, Android and iPhone apps. The best Skim alternative is SumatraPDF, which is both free and Open Source. Other great apps like Skim are Okular, Foxit PDF Reader, Xournal++ and PDF-XChange Editor.
Professional PDF tools without the cloud. 100% offline, native performance, and zero data collection. Your documents stay where they belong: on your device.




A powerful, privacy-respecting PDF editor built for Linux users. Edit, annotate, merge, and manage PDF documents—without subscriptions or cloud dependencies.



A privacy-first PDF tool suite that processes files entirely in your browser. Merge, split, and convert PDFs without ever uploading them to a server.
