Merge PDF Files Locally
Combine multiple PDFs into a single file right in your browser. Your files stay private — no upload.
Select PDF files to merge
Click or drag and drop multiple PDF files here
How to merge PDF files
- 1
Select your PDFs
Click or drag and drop the PDF files you want to combine.
- 2
Reorder your pages
Drag and drop to rearrange pages. Rotate individual pages if needed.
- 3
Download the merged PDF
Click Merge and download your combined PDF — all done in your browser.
Frequently asked questions
Are my PDFs uploaded anywhere?
No. Merging happens entirely in your browser. Your files never leave your device.
Is there a limit on file size?
There is no hard limit, but performance depends on your device and browser. Very large files may take longer.
Can I rearrange pages across documents?
Yes. You can reorder pages from all documents in any order before merging.
Related PDF Tools
Split PDF | Extract PDF Pages | Delete PDF Pages | Reorder PDF Pages
When to Use Merge PDF
Combining invoices
Merge multiple invoice PDFs into a single file for easier record-keeping and sharing with accountants or clients.
Merging scanned chapters
Combine separately scanned book chapters or sections into one complete document for reading or printing.
Assembling reports
Join cover pages, body content, and appendices from separate PDFs into a polished final report.
Combining contracts
Merge signature pages, terms, and exhibits into one complete contract package before sending for review.
Limitations & Known Issues
- Large files may be slow. Merging very large or many PDFs can be memory-intensive and may slow down on older devices.
- Password-protected PDFs need password removal first. Encrypted or locked PDFs cannot be read by the browser. Remove passwords before merging.
- Digital signatures may be invalidated. Merging signed PDFs typically breaks digital signature verification since the document content changes.
- Form fields may not merge correctly. Interactive form fields from different PDFs may conflict or be lost during the merge process.
Browser & Device Support
This tool works in all modern browsers: Chrome, Firefox, Edge, and Safari. Processing performance varies by device memory — larger files perform best on desktop with 8 GB RAM or more. Mobile devices may struggle with very large merges.