Split a textbook or lecture pack into chapters
A course pack that holds the whole syllabus in one heavy file opens slowly on a phone, and the page you want gets lost in it. Break it into chapters, or pull out just the chapter you are studying tonight. It all happens in your browser and the file never leaves your device.
Drop your files here
Files are processed on your device and never uploaded
Count pages the way the file counts them, not the book
This is where most splits go wrong. The page number printed at the bottom of a book page usually does not match the page number inside the PDF, because the cover, contents, and introduction come before the first numbered page. If chapter two starts on printed page 45 and the front matter runs ten pages, the page you actually need is 55 inside the file. Open the file and read the page number from your reader's own counter before typing a range, not from the corner of the page.
One range, or split it all
There are two ways to work. Type a range like 45-88 to get a single file holding one chapter, which is the fastest route the night before an exam. Or turn on the split-every-page option to get a ZIP with one PDF per page, which suits you when you want to rebuild the order from scratch. To cut a whole course into chapters, repeat the split once per chapter with a different range, and you end up with a clean file per unit.
Pages are copied exactly as they are
Splitting here does not redraw or recompress pages. It copies them into a new file untouched, so Arabic text stays sharp, selectable, and searchable, and diagrams and tables keep their original quality. If the pack is a large scan, compress after splitting rather than before, so you only compress the chapter you actually need.
Three steps, that's it
Drop the textbook or lecture pack into the tray
Type the chapter range like 45-88, or choose split all pages
Download the chapter as one file, or a ZIP of every page
Frequently asked questions
The file is very large. Will it work on a phone?
Splitting runs inside the browser and depends on your device's memory. Medium files handle fine on a phone; for a huge scanned textbook, split it on a computer instead.
How do I pull out more than one chapter at once?
Write the ranges separated by commas, like 12-30,45-88, and you get a single file holding both chapters in the order you typed.
Does it affect diagrams and charts?
No. Pages are copied with no recompression, so diagrams and charts come out identical to the original.
