Merge PDF — free, private, in your browser

How to merge PDFs

Combining your PDF files takes just a few seconds, and everything happens right here in your browser:

1. Add your PDFs. Drag PDF files onto the drop zone above, or click Choose PDFs to pick them. You can add as many as you like.
2. Set the order. Each file shows in a numbered list. Use the up and down arrows to reorder them, or the ✕ button to remove one — the order on screen is the order of pages in your merged PDF.
3. Click "Merge PDFs". All the pages from every file are combined in order, and the finished document downloads as merged.pdf.
4. Done — privately. Your files were never uploaded. The whole merge ran on your own device.

Why combine PDFs into one file

• One tidy document. Bundle chapters, invoices, scanned pages, or signed contracts into a single file that's easy to share and print.
• Simpler sharing. One attachment instead of ten — easier to email, upload to a portal, or archive.
• Better for paperwork. Many forms and offices want a single combined PDF — perfect for applications, reports, and submissions.
• Privacy by design. Because this tool is fully client-side, confidential documents never touch a server.

Private and offline by design

Most online "merge PDF" sites upload your files to their servers to combine them. This one doesn't. It uses the open-source pdf-lib library to build the merged PDF directly in your browser, so your files never leave your device — you can even disconnect from the internet after the page loads and it still works. For heavier, repeatable jobs on Windows — running OCR on scans, editing text inside PDFs, splitting or compressing, or processing folders of files in bulk — try Kaizen OCR & PDF.

Frequently asked questions

Yes — completely free and unlimited, with no signup and no watermarks. It runs locally in your browser, so you can merge as many PDF files as you like.

No. The merge happens entirely inside your browser using JavaScript. Your PDFs never leave your device and are never sent to any server, which keeps confidential documents fully private.

Yes. After you add your files, use the up and down arrows to set the order, or remove any file with the ✕ button. The order you see is the exact order of the pages in the merged PDF.

Encrypted or password-protected PDFs cannot be merged until the password is removed. The tool shows a clear message if a file is encrypted or corrupt. Remove the password first, then add the file again — or use Kaizen OCR & PDF, which can add and remove PDF passwords offline.