How to merge PDF files
- Add your PDFs. Drag your files onto the box or click to browse. The page count for each file is read instantly, on your device.
- Set the order. Use the ↑ and ↓ buttons to arrange the files top to bottom — that becomes the page order in the final document. Remove any file with ✕.
- Merge & download. Press Merge & download. Every page from each PDF is copied into one new file in order.
- Save your file. The combined
merged.pdfdownloads straight to your device — no email, no link, no waiting.
Why combine PDFs into one file?
A single PDF is simply easier to handle than a folder full of separate documents. Merging is the quickest way to assemble a complete record from pieces that were created or scanned at different times.
- One attachment to send. Email a finished report or signed agreement as a single file instead of five.
- Tidy paperwork. Join scanned receipts, an ID, a cover letter and a CV into one application packet.
- Better for printing & archiving. A combined PDF keeps pages in a fixed, predictable order for printing or long-term storage.
- Portals that accept one file. Many upload forms allow a single PDF only — merging gets you under that limit.
Is it private?
Yes. Unlike most “merge PDF” websites that upload your documents to a server and process them in the cloud, this tool combines your files entirely on your device using the open-source pdf-lib library. Your PDFs and the finished file arenever uploaded or stored anywhere — which matters when the pages contain contracts, bank statements or personal identification. It even keeps working offline once the page has loaded, and the merged file exists only on your computer.
Frequently asked questions
Does it upload my PDFs?
No — the files are merged in your browser with JavaScript; nothing leaves your device.
Can I reorder the files before merging?
Yes, use the ↑ ↓ buttons. The merged document follows the order shown in the list, top to bottom.
Will it work on a password-protected PDF?
It can often read encrypted files for merging, but a PDF with a strong open-password may fail. Remove the password first if you hit an error.
Is there a page or file limit?
No fixed limit. Since it all runs locally, only your device's memory caps how large the merge can be.
Related: turn images into a PDF first, then merge them with your other documents here.