Split PDF
Turn a long PDF into chapters you can actually study
Split a book along its own chapter marks, in your browser. Drop a PDF below and see its contents — nothing is uploaded, and nothing is cut until you say so.
Free account · No credits · Everything happens in your browser
See your own book's chapters
Drop one here, or choose a file.
Nothing is uploadedNothing is splitNothing is downloadedYour PDF never leaves your browser. Up to 250 MB on a computer, 80 MB on a phone or a narrow window.
How it cuts
Along the book's structure, not an arbitrary page number
If your PDF carries bookmarks — the contents list your reader shows in its sidebar — every one of them becomes a place the file can be cut.
- By chapterTick the ones you want, or take all of them at once. The cuts land exactly where the outline says a chapter begins.
- By handClick any page to add a cut there, or remove one you added. Useful when a chapter is really two topics.
- Every N pagesFor a book with no outline at all: pick a number and get even parts.
Why bother
A book is something you reference. A chapter is something you can finish.
A nine-hundred-page PDF is a place you open, scroll, lose your position in, and close again — and every tool you point at it inherits that. A chapter has a beginning, an end, and a size you can hold in your head, and it is small enough for a tool to read all of at once.
- You can tell when you are doneFinishing chapter four is a fact. “Making progress on the textbook” is a feeling.
- Everything downstream gets betterA test, a set of questions, a mindmap — all of them are sharper when the material has an edge.
- You can come back to one partRe-reading the chapter you struggled with does not mean scrolling through eight hundred pages first.
Where your file goes
Nowhere. And you can check that yourself.
Your PDF never leaves your browser — no upload, no server, no copy of your file anywhere.
How to verify it in about ten seconds
- 1Open your browser's developer tools and go to the Network tab.
- 2Drop a PDF on the box at the top of this page.
- 3Watch what is requested: the PDF reader and its worker, and nothing carrying your file.
What the network tab shows
- the PDF reader
- its worker
- your filenever requested
What we will not claim
The page is not silent. It loads the PDF reader, and it records that a file was read — as one of three words: outline, no-outline, or refused. Not the name, not the size, not the page count. And in the app the tool sits behind a login, so “works offline” would be false.
The edges
What it will refuse, and what it will not do
All of it happens in a browser tab, and a browser tab has a ceiling.
On a computer250 MB
On a phone or a narrow window80 MB
Pages3,000 max, 2 min
The ceiling is the tab's memory, not a plan: reading a PDF costs several times its size while it is open.
The lower figure applies to a narrow window as well as a phone — it is the width that decides, not the device.
Up to 250 MB on a computer, 80 MB on a phone or a narrow window. Up to 3,000 pages, and at least two.
What it does not do
- It splits. It does not merge, reorder, rotate or compress anything.
- The parts together are a little larger than the original — each keeps its own copy of the fonts and images its pages use.
- Bookmarks and internal links are dropped from the parts; links to the web are kept.
- A chapter list needs bookmarks. There is no text scanning and no OCR.
Questions
Before you cut anything
No. Your PDF never leaves your browser — no upload, no server, no copy of your file anywhere. The reading on this page and the splitting in the app both run on your own machine.
The edges
One chapter, and a place to work through it
Splitting is the boring half. The useful half is what a chapter-sized file lets every other tool in Ritsu do with your material.
Free account · No credits · Everything happens in your browser