How to Merge PDF Files – Fast, Secure & Free
This 100% client-side PDF combiner lets you merge multiple PDF documents into one file directly in your browser. No file uploads, no server processing – your privacy is guaranteed.
⚡ Instant & Offline
All processing happens locally using PDF-Lib.
🔁 Drag & Reorder
Simply drag PDF cards to change merge order.
🔒 100% Private
Your files never leave your device.
📌 How to use this tool
- Click “Add PDFs” or drag & drop files into the upload area.
- Drag any PDF card and drop it before/after another to change the merging order.
- Click “Merge PDF” – the tool will combine all documents instantly.
- Click “Download Merged PDF” to save the final file to your computer.
❓ Frequently Asked Questions
❓ Are my PDF files uploaded to a server?
No, never. The merging happens entirely inside your browser using the PDF-Lib library. Your files remain on your device.
❓ Is there a file size limit?
It depends on your device’s memory. Typically, merging up to 150–200 MB total works smoothly on modern computers.
❓ Can I merge password-protected PDFs?
Unfortunately, no. You must unlock protected PDFs first using appropriate software.
❓ Does merging affect quality?
Not at all. The original quality, fonts, images, and layout are perfectly preserved.
❓ Is this tool really free?
Yes! It is completely free for personal and commercial use, with no watermarks or hidden fees.
⚙️ Powered by PDF-Lib • Client-side processing • No tracking