Protect to PDF
A fully client-side PDF protection tool that secures your documents with passwords directly in your browser. No uploads, no servers, your data stays private.
Secure & Private
All processing happens in your browser. Your files never leave your computer.
Password Protection
Add strong passwords to prevent unauthorized access to your PDFs.
Fast Processing
Quick encryption without waiting for server processing or uploads.
No Installation
Works directly in your browser on any device. No software to install.
Select PDF File
This tool works entirely in your browser. Your PDF files are never uploaded to any server.
Drag & Drop your PDF file here
or
Maximum file size: 25MB
example.pdf
2.4 MB
Process & Download
Select a PDF file and set your protection options on the left to get started.
Once you click "Protect PDF", the encryption process will begin. This may take a moment depending on the file size.
How PDF Protection Works
This tool uses PDF encryption to secure your document:
- Passwords are hashed using strong encryption algorithms
- The PDF content is encrypted with AES-256 when possible
- Permissions control what users can do with the document
- Encryption happens locally in your browser
Important Information
- This tool works entirely in your browser. No data is sent to any server.
- For maximum security, use strong passwords with a mix of letters, numbers, and symbols.
- If you set both user and owner passwords, they should be different for better security.
- Remember your passwords! We cannot recover them if you forget.
- The original file remains unchanged. The protected version will be downloaded separately.
Note: Due to browser limitations, very large PDF files (over 25MB) may cause performance issues. For best results, use files under 10MB.