Extract PDF Pages makes a new PDF from only the pages you choose, and leaves your original untouched. Tap the page previews to select them, Shift+click to select a run, or type the pages in the box (1-3, 7, 10-), and the unselected pages fade so you can see what you will get. Then choose how to save: all selected pages together in one PDF, or each selected page as its own PDF, downloaded as a ZIP.
The extraction runs in your browser with pdf-lib. Pages are copied as they are, so text stays selectable and images keep their quality. When you save them as one PDF, the title and author of the original stay, as do links and fillable form fields on the pages you took.
Honest limits: the pages come out in their original page order, whatever order you clicked them in; to change the order, use Organize PDF afterwards. Bookmarks to pages you didn't take no longer jump anywhere. Password-protected PDFs need to be unlocked first, and files up to 200 MB are accepted.