How to Merge PDF Files
Merging PDF files is one of the most common document management tasks. Whether you need to combine reports, merge invoices, or consolidate research papers, our free online PDF merger makes it effortless.
Why Merge PDFs?
Combining multiple PDFs into a single document offers several advantages: easier sharing via email, better organization of related documents, reduced clutter in your file system, and professional presentation when submitting combined reports.
How Our Merger Works
Our PDF merger uses the pdf-lib JavaScript library running entirely in your web browser. When you upload files, they are loaded into your browser's memory — never sent to any server. The merger then combines the page objects from each PDF and saves the result as a new file.
Tips for Best Results
- Upload PDFs in the order you want them merged, or drag to reorder after uploading
- Each PDF can be a different page size — the merger preserves original dimensions
- For very large files (50MB+), ensure your browser has enough available memory
- Test with a small sample first if you're working with critical documents