Split a PDF Into Multiple Files — In Your Browser
Splitting a PDF is the complement to merging. Instead of combining multiple documents into one, you're dividing one large document into smaller, more manageable pieces. Cluster Tools handles this entirely in your browser using PDF-lib — no upload required.
Split Modes
Split into individual pages — each page becomes its own PDF. Useful for: splitting a multi-page scan where each page is a separate document, creating individual page exports for workflows that process one page at a time.
Split every N pages — divide the document into equal chunks. A 60-page report split every 20 pages produces three 20-page PDFs. Useful for: breaking up large reports into chapters, dividing a document for multiple reviewers.
Split at specific page numbers — define exact split points. "Split at pages 10, 25, 45" produces four PDFs: pages 1–10, 11–25, 26–45, and 46–end. Useful for: separating documents with known chapter boundaries, splitting a combined scan at document boundaries.
Step-by-Step: How to Split
- Drop your PDF into the tool above.
- Choose a split mode — individual pages, every N pages, or custom page numbers.
- Configure the split — enter N (for "every N pages") or the page numbers (for custom splits).
- Click "Split" — the tool generates multiple PDFs in memory.
- Download — all output PDFs are bundled in a ZIP file.
Frequently Asked Questions
Does splitting preserve the original formatting? Yes — PDF-lib copies pages faithfully from the source. Fonts, images, annotations, and layout are preserved exactly.
Can I split a password-protected PDF? Only after supplying the correct password to unlock it.
What's the maximum PDF size I can split? No server limit. Processing is done in your browser; very large PDFs (hundreds of MB or thousands of pages) may take longer but will complete given sufficient browser memory.
Will each split PDF be self-contained? Yes — shared resources (fonts, embedded images) are copied into each split file as needed, so each output PDF opens correctly on its own.
Related Tools
- Merge PDF — combine split PDFs back together.
- Extract PDF Pages — select specific non-contiguous pages rather than splitting by range.
- Delete PDF Pages — remove specific pages before splitting.
- Compress PDF — reduce the size of your split PDFs.