PDF Merger
Combine multiple PDF files into one.
About This Tool
PDF Merge is a free online tool that combines multiple PDF files into a single document in seconds — entirely in your browser, with no upload required. Upload any number of PDFs, drag to arrange them in the order you want, and click Merge to get an instantly downloadable combined PDF. No registration, no size limits beyond your device's memory.
The merge is powered by pdf-lib, a JavaScript library that runs entirely client-side. Your documents never leave your device, making it safe for sensitive contracts, legal documents, financial reports, and other confidential files. Each source PDF's page content, formatting, and embedded resources are preserved in the output.
PDF Merge is most useful for consolidating invoices, combining multi-chapter reports, assembling application documents from separate files, and packaging multiple scanned pages into a single shareable PDF. It pairs well with PDF Split for dividing the result into sub-ranges after merging.
Add PDF Files
How to Use
- 1
Upload two or more PDF files by clicking Add PDF Files or dragging them in.
- 2
Drag to reorder the files in the list to set the page order you want.
- 3
Click Merge PDFs and download the combined document.
- 4
Open the merged PDF to verify page order and content before distributing.
- 5
Add additional files and repeat the merge if you need to include more documents.
Features
Combine Multiple PDFs
Merge any number of PDF files into a single document in just a few clicks.
Reorder Files
Drag and drop to reorder the PDFs before merging to get the exact page order you need.
Browser-Based Processing
PDF files are merged locally in your browser using pdf-lib. No uploads required.
Instant Download
Download the merged PDF immediately after processing with no delays.
Common use cases
- ›Combine monthly invoices or receipts into a single PDF for accounting or expense reports.
- ›Merge separately scanned pages of a document or contract into one complete PDF.
- ›Assemble job application materials (CV, cover letter, certificates) into a single file.
- ›Join multi-chapter reports or presentations from different contributors into one document.
Read our guide
PDF Merger — Complete Guide →FAQ
Is there a file size limit?
Processing happens in your browser, so it depends on your device memory. Most files work fine.
Can I reorder the PDFs?
Yes, use the up/down buttons to reorder files before merging.
Does it preserve PDF bookmarks and hyperlinks?
pdf-lib preserves the page content of each PDF. Bookmarks (outlines) from individual files are not merged into a combined outline, but page content and embedded links are preserved.
Can I merge password-protected PDFs?
Password-protected PDFs cannot be processed in the browser. You will need to remove the password protection before merging.
How many PDF files can I merge at once?
There is no hard limit on the number of files. However, very large PDFs or many files may require more browser memory. Merging in two passes (merge A+B, then merge result+C) helps with large batches.