What is Merge PDF?
Merge PDF joins several PDF documents into a single file. Add the PDFs you want to combine, drag them into the right order, and download one merged PDF. Everything happens locally in your browser using PDF-lib, so your documents are never uploaded to a server.
How Merge PDF works
How to merge PDF files
- Drop your PDFs onto the box or click to choose them.
- Use the ↑ ↓ buttons to set the order you want.
- Click Merge PDFs to download the combined file.
Private and free
The merge runs entirely in your browser — nothing is uploaded, there is no file-size sign-up wall, and the output carries no watermark.
Common uses
- Combine scanned pages into one document
- Join chapters or reports into a single PDF
- Merge invoices or receipts for filing
- Assemble a portfolio from several PDFs
Frequently asked questions
How do I merge PDF files for free?
Add your PDFs, arrange the order, and click Merge — it is free with no watermark.
Are my PDFs uploaded?
No. Merging happens entirely in your browser; your files never leave your device.
Is there a limit?
No fixed limit — though very large files use more memory in your browser.
Can I reorder the files?
Yes — use the up/down buttons before merging.