Free PDF Splitter

How It Works

PDF splitting runs entirely in your browser using pdf-lib to copy pages into new documents and pdfjs-dist to render live thumbnails — your file is never uploaded to any server.

1. 1
   pdf-lib reads the PDF structure

   When you drop a file, pdf-lib loads the raw ArrayBuffer and parses the PDF's internal page tree. It counts the pages and makes them available for copying without decoding every embedded font or image.
2. 2
   pdfjs-dist renders page thumbnails

   In parallel, pdfjs-dist (loaded via CDN worker) rasterizes each page onto an offscreen Canvas element at a fixed 220 px width. The JPEG data URLs fill into the thumbnail grid progressively as each page renders, so you can start selecting pages before the whole document is ready.
3. 3
   You choose a split strategy

   Three modes are available: split every page into its own PDF, split into chunks of N pages at a time, or cherry-pick individual pages by clicking thumbnails or typing a range like '1-3, 7, 10-12'. The thumbnail grid highlights selected pages and alternating chunk boundaries so the split plan is visible before you commit.
4. 4
   pdf-lib writes new PDFs; JSZip bundles the output

   For each output group, pdf-lib creates a new PDFDocument and copies only the selected pages into it using copyPages(). When the result is multiple files, JSZip collects them into a single ZIP. A single extracted range downloads directly as a PDF without zipping.

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