Is it safe to merge PDFs online?

Yes. UnblockPDF processes your files entirely in your browser. Your documents never leave your device, so your data stays private and secure at all times.

How many PDFs can I merge at once?

You can merge up to 10 PDF files in a single batch. Each file can be up to 50 MB for anonymous users or 100 MB for registered users.

Can I reorder pages before merging?

Absolutely. After uploading your files, you can drag and drop them into any order you prefer before merging them into one document.

Do I need to install any software?

No installation needed. UnblockPDF works directly in your web browser on any device — desktop, tablet, or phone.

Merge PDF Files Online

Combine two or more PDF files into a single document in seconds. Simply drag and drop your files, reorder them as needed, and download the merged result. All processing happens in your browser for maximum privacy.

Try it now

Key Features

Combine unlimited PDFs into one document
Drag and drop reordering
Browser-based processing for privacy
No watermarks or file size limits for basic use
Works on any device with a modern browser

How to use Merge PDF Files Online

1
Upload your PDF files
Click the upload area or drag and drop multiple PDF files from your computer.
2
Arrange the order
Drag and drop the files to arrange them in the order you want them to appear in the final document.
3
Merge and download
Click the Merge button to combine all files into one PDF. Your merged document will be ready to download instantly.