Local browser tool
Merge PDF
Combine several PDFs in the order you choose without uploading them.
● Selected files stay on this deviceChoose PDF files
Drop files here or browse your device
Steps
How to use Merge PDF
- Choose PDFs in the order they should appear.
- Check the filenames and sizes before processing.
- Download one combined PDF.
Worked example
Combine a cover and three appendices
Select cover.pdf first, then appendix-a.pdf, appendix-b.pdf and appendix-c.pdf.
Result: The result begins with the cover and keeps every source page at its original dimensions.
Supported
What this tool handles
- Mixed portrait and landscape pages
- Different page dimensions
- Ordinary text, vector and scanned PDFs
Not supported
Important limitations
- Password-protected files
- Preserving cryptographic signatures
- Repairing broken bookmarks or conflicting form fields
Operational limits
- 2–20 PDF files
- Maximum 50 MB combined and 500 pages
- Encrypted PDFs are not supported
Troubleshooting
Common problems
The order is wrong
Choose the files again in the intended sequence; the browser uses picker order.
A signed file shows a warning
Merging changes the PDF bytes and normally invalidates existing digital signatures.
Questions
Merge PDF FAQ
Are my PDFs uploaded?
No. This tool runs locally in a browser worker and never sends the selected files to the conversion API.
Are pages resized?
No. Each copied page retains its original dimensions.
Learn before converting