Open a PDF — drop it anywhere on the page, or click the dashed box. A password-protected file asks for its password. "Choose another PDF" starts again with a different file.
Cut — click the ✂ between two pages to cut the file there. Click it again to take the cut away. With the keyboard: Tab to the scissors, move with the arrow keys, press Enter or Space to cut. "Cut after every page" makes every page its own file. "Clear all cuts" takes every cut away.
Parts — pages of the same colour go into the same new file. The label on a page shows where a part starts. The list on the right shows every part with its pages and its file name.
Download — "Download all (ZIP)" gets every part in one ZIP file. The ⤓ next to a part gets just that part as a PDF.
What stays — pages are copied as they are: text, fonts and images are not re-printed or blurred. Links and bookmarks go with their pages; a link to a page in another part stops working. Form fields stay fillable. A file that had a password comes out without one.
How to use — the ▶ How to use button at the top shows a short tour of this screen, any time.
Nothing is uploaded. Everything happens in this browser tab.