PDF Merger
PDF Merger
Merge multiple PDFs into one document.
Runs entirely in your browser
How to use this tool
- Fill in the inputs.
- Read the result.
- Copy or download as needed.
About the PDF Merger
The PDF Merger combines two or more separate PDF files into a single, unified document, preserving every page from each source file in the order the files were added. Upload your PDF files, confirm the list, and download one combined PDF containing every page.
Merging PDFs is a common task when assembling a report from several separately authored sections, combining multiple scanned documents into one file, or consolidating a set of related PDFs for easier sharing and organization.
The tool uses the pdf-lib library to create a new, empty PDF document, then loops through each uploaded file in order, reading its pages and copying them one by one into the new combined document. This page-copying approach preserves the original formatting, images, and text of every page exactly as it appeared in its source file.
Because every file is loaded and processed directly in your browser's memory, the merging happens quickly for typical document sizes, and the final combined file is only made available for download once every source file has been fully processed and appended.
Common use cases
- Combining multiple chapters or sections of a report, each saved as a separate PDF, into one complete document.
- Merging several scanned pages, each saved as an individual PDF, into a single multi-page file.
- Consolidating a set of related contracts, invoices, or forms into one PDF for easier sharing.
- Combining a cover page or table of contents PDF with the main body of a document.
- Assembling multiple people's individually submitted PDF sections into a single combined submission.
Tips and best practices
- Files are merged in the order they appear in your selected file list, so double-check the order before merging if page sequence matters.
- At least two PDF files are required to use the merge function, since merging a single file would have no effect.
- Very large PDF files or a large number of files may take a bit longer to process, since everything happens within your browser's available memory.
- After merging, review the combined PDF to confirm that page order and content appear exactly as expected before sharing or submitting it.
