Split and Merge PDF
Split a PDF into multiple files by page range, or merge several PDFs into a single document. Both directions run entirely in your browser.
Click to upload a PDF file
Your file is processed entirely in your browser
Recommended Settings
Pro Tips
- •When splitting, each comma-separated group (like 1-3, 4-6) downloads as its own separate PDF file
- •When merging, use the up/down arrows to reorder files before combining - pages are added in the order files are listed
- •Merging preserves each source document's page sizes and content exactly as they were
- •The whole process runs locally in your browser using pdf-lib - nothing is uploaded anywhere
Most Popular
Most users split a scanned document into chapters, or merge several single-page scans into one file
When to Use This Tool
Merge separate PDF files - like scanned pages, signed forms, or exported reports - into a single combined document.
Split a large PDF book or report into separate files by chapter or section for easier distribution.
Merge individually scanned pages into one properly ordered PDF document.
Pull out just the pages you need from a large PDF into a smaller, focused document.
How It Works
For splitting: read the uploaded PDF, parse the page ranges you enter, and create a new PDF document for each group by copying the specified pages
For merging: read each uploaded PDF in the order listed and copy every page into a single combined PDF document
Both operations use pdf-lib's page-copying API, which preserves the original content, fonts, and images exactly
Save the resulting file(s) and trigger a download for each
100% Private
Files never leave your device. All processing happens locally in your browser.
Lightning Fast
Powered by pdf-lib for optimal performance on modern browsers.
Open Source
Built with verified, open-source libraries. Fully transparent.
Frequently Asked Questions
How do I specify page ranges when splitting?
Enter comma-separated groups, where each group becomes its own output file - for example 1-3, 4-6, 7 creates three files: pages 1-3, pages 4-6, and page 7 alone.
Can I merge PDFs with different page sizes?
Yes. Each page keeps its original size and orientation when merged - pdf-lib doesn't resize or reformat pages to match each other.
Why do multiple files download at once when splitting?
Since each page range becomes a separate PDF, the tool triggers a download for each one in sequence. Your browser may ask for permission to allow multiple downloads the first time.
Is my PDF uploaded to a server?
No. All splitting and merging happens locally in your browser using the pdf-lib library. Your documents never leave your device.
Can I reorder files before merging?
Yes. Use the up and down arrow buttons next to each file in the list to change the order before merging - pages are combined in the order shown.