How to Use Merge PDF
Upload your PDF
Drag and drop a file into the upload area, or click it to browse — it's processed on your device, never uploaded to a server.
Set your merge options
Adjust the settings for this tool to get exactly the result you need.
Download the result
Click the action button to generate your file and download it immediately.
Features
🔒 Private by default
Your files are processed locally in this browser tab wherever this tool supports it — never uploaded to a server.
⚡ Fast, in-browser processing
Powered by pdf.js and pdf-lib running directly on your device — no waiting on a server queue.
🖥️ Works on any device
Use it from desktop, tablet or mobile — the tool interface adapts to your screen.
💸 No install required
It's a web tool — nothing to download or set up before you can use it.
FAQ
Drop two or more PDFs into the upload area, arrange them in the order you want using the up/down arrows, then click Merge & Download.
There's no hard limit in the tool itself — it's bound only by your browser's available memory, since everything is processed on your device.
Yes — use the ▲ / ▼ buttons next to each file, or uncheck a file to leave it out of the merge.
No — merging happens locally in your browser tab using pdf-lib; files are never transmitted anywhere.
Yes, a single merged.pdf downloads automatically as soon as merging finishes.