Specify page numbers to remove – comma-separated or as ranges: '2, 5, 8-10'. Pages are counted from the beginning. If unsure of numbers, review the thumbnails first.
Deletion does not modify the original file: the service creates a new PDF with the remaining pages. Order and content of remaining pages are unchanged.
If you need to keep only a few specific pages, the split tool with range selection is more intuitive – same result, clearer 'what to keep' logic.