PDF Splitter

Yes — this splitter runs entirely in your browser. Your file is read locally, the pages you choose are copied into new files on your own device with the pdf-lib library, and the downloads come straight from your browser. Nothing is sent to a server at any point. That matters more for splitting than for most PDF jobs, because the files people split — a 300-page invoice bundle, a medical record, a legal discovery file — are usually the files they least want uploaded anywhere. There is no sign-up and no page limit, and the split pages come out at exactly the original quality, because splitting copies whole pages rather than re-rendering them.

The question that prompted this tool came from a real 300-page file: hundreds of invoices scanned into one PDF, some one page, some two or three, that needed separating. We built a 300-page test file and ran all three split modes against it to verify the arithmetic:

The every-40 row is the one to notice: 300 does not divide evenly by 40, so the last file holds the 20 remaining pages rather than the tool failing or dropping them. Every output file was re-opened and its page count checked — 12 files of exactly 25, the 8-page extract, and the 100/200 split all came out exact.

This tool splits by page, not by reading invoice numbers out of the text — and any tool that claims to split your invoices automatically is making promises about your scan quality it cannot keep. Scanned invoices are pictures, not text, and even text-based PDFs lay invoice numbers out differently on every template. The workflow that actually works: open the file in your PDF reader, search for the first invoice number, and note the page it sits on. Repeat for the next invoice. The gap between those two page numbers is the first invoice's range. Extract that range here, and you have one file per invoice. For a 300-page bundle this takes a few minutes of searching — slower than magic, but every file it produces is correct, which is the part that matters when the files go to an accountant or a client.

Two habits make it faster. First, work from a list: write down each invoice's start page before you extract anything, so you are not switching back and forth between the reader and this tool. Second, extract one invoice, open the output, and check its first and last pages before doing the rest — if your ranges are off by one page, you find out on the first file, not the thirtieth.

Password-protected PDFs cannot be split: the lock that stops editing also stops page copying, so unlock the file in your reader first. Splitting copies pages, so bookmarks, outlines and interactive form fields do not carry into the output files — if a page holds a filled-in form, flatten it (print to PDF) before splitting so the entered text becomes part of the page. Very large files are limited by your device's memory rather than by any rule in the tool, and splitting into dozens of files means dozens of downloads, which some browsers ask permission for first. If you need the pieces back together afterwards in a different order, the PDF Merger recombines them.