Protect PDF
Encrypt and secure your PDF files with strong passwords. Protect sensitive information and prevent unauthorized access. 100% private.
Drag & drop your PDF here
Upload one PDF to password protect
Max file size: 100 MB
How to Protect PDF online for free
Upload the PDF document you want to password protect.
Enter a strong password of your choice in the security settings.
Click the 'Protect PDF' button to encrypt the file client-side.
Download your secure, password-protected PDF.
Features of our Protect PDF tool
100% Privacy & Security
All processing occurs locally in your browser using WebAssembly. Your files never leave your computer.
Fast & Free
Instant processing with zero wait times. No subscriptions, limitations, or hidden costs.
No Installation Needed
Access PDFCraft from any modern browser on Windows, Mac, Linux, iOS, or Android.
High Fidelity
Our client-side rendering engines maintain high quality, formatting, and layout styles.
Frequently Asked Questions
What encryption standard is used?▼
Our tool utilizes secure PDF encryption algorithms (RC4/AES) to apply owner and user passwords, which are compatible with all standard PDF readers like Adobe Acrobat.
Can PDFCraft see my password or files?▼
No. Since all encryption operations happen locally inside your web browser, your password and files never leave your device.