In short
This tool splits a PDF into several files: separating statements bundled into one document, isolating the chapters of a book, slimming down an attachment that is too heavy for email. It offers four modes: every N pages, by ranges (“1-3, 5, 8-10”, one range per file), one page per file, or by size, with each file staying under the limit you choose in MB. A page that exceeds this limit on its own becomes a separate file. The pages are copied without being re-printed, with the document's title and author, but without its bookmarks. As soon as there are several files, they are delivered in a ZIP archive. The splitting happens in your browser.