Take out just the pages you need, or break a PDF into several files. Select pages by clicking their thumbnails or by typing ranges such as 1-3, 5.
Yes. Arabic digits and the Arabic comma work, for example ١-٣، ٥.
Choose "Every page as its own PDF". You'll get a ZIP file with one PDF per page.
No. Your original stays as it is; the tool creates new files.
Everything happens in your browser. Your files are never uploaded to a server, so nobody else can see them.