Protect PDF Online
Add password protection to PDF files — free, private, and instant. Your file never leaves your device.
🔒
Drop your PDF here, or click to browse
PDF · PDF files up to 200 MB
What Is PDF Password Protection?
PDF password protection encrypts a PDF document so that it requires a password to open. This is useful for sharing sensitive documents securely.
TweakFiles protects PDFs entirely in your browser using pdf-lib. Your file and password are never sent to any server.
Common Use Cases
- Sharing confidential contracts and legal documents
- Protecting financial statements and tax forms
- Securing medical records and personal information
- Distributing internal company documents
How to Protect a PDF in 3 Steps
1
Upload Your PDF
Drag and drop your PDF into the drop zone above, or click to browse.
2
Set a Password
Enter a strong password to protect the PDF.
3
Download Protected PDF
Click download to save the password-protected copy.
TweakFiles vs Other PDF Protection Tools
| Feature | TweakFiles | Others |
|---|---|---|
| Price | Free forever | Free / Paid |
| Privacy | 100% client-side | Server upload |
| Signup | Never | Often required |
Frequently Asked Questions
Yes, 100% free with no limits.
Yes, everything is processed in your browser.