Protect PDF
Add password protection to your PDF
Drop your file here
or click to browse from your computer
Supported: .pdf • Max 10MB
How to protect pdf
1
Upload your PDF
Select the PDF file you want to protect.
2
Enter a password
Choose a strong password for the document.
3
Click Protect PDF
Password protection is applied instantly in your browser.
4
Download
Save the protected PDF and share it securely.
About Protect PDF
Secure your sensitive PDF documents by adding password protection with PDFNinja. Set a password that recipients must enter before they can open the file. This adds a layer of access control suitable for sharing confidential reports, contracts, and personal documents.
All encryption happens in your browser — the file and password never leave your device, making this the most private way to protect a PDF online.
Features
- Set open/access password
- Metadata-level protection
- Processing done entirely in-browser
- Password never sent to any server
- Compatible with all major PDF readers