Protect PDF
Add password protection to your PDF documents with AES-256 encryption. Set permissions for printing, copying, and editing.
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Drop your PDF here or browse
Single file - Max 50MB
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How It Works
1
Upload Your File
Drag and drop your PDF file or click to browse. We support files up to 50MB.
2
Process Your File
Configure your settings and let our tool do the work. Processing takes just seconds.
3
Download Result
Your processed file is ready instantly. Download with a single click.
Why Use 4uPDF?
100% free for basic usage
No registration required
Secure processing - files deleted after 1 hour
Works on any device - desktop, tablet, or mobile
Fast processing with powerful servers
No software installation needed