Free PDF Password Protector
Secure your confidential PDF documents with strong password encryption. Prevent unauthorized access, restrict document permissions, and download your locked PDF instantly.
PDF Encrypted Successfully!
Your document is now password protected.
How to Password Protect a PDF Online
Select PDF
Choose or drag & drop the PDF file you want to secure from your device.
Enter Password
Create a strong password and select your desired encryption standard.
Download Encrypted PDF
Click Encrypt. Your protected PDF is generated instantly in your browser.
AES-256 Encryption
Protected using industry-standard AES 256-bit encryption for bank-grade document protection.
100% Confidential
Your password and documents never leave your browser. Encryption is computed strictly on your device.
Instant Processing
No waiting on server uploads. Even huge PDF files encrypt in just a fraction of a second.
Cross-Platform Compatible
The resulting encrypted PDF can be opened with any standard PDF reader (Adobe Acrobat, Preview, Chrome, iOS/Android).
Frequently Asked Questions
No. When you set an open password with AES-256 encryption, the contents of the document cannot be read or viewed without supplying the correct password in a standard PDF viewer.
Never. Files Craft performs all cryptographic operations strictly inside your web browser via the Web Crypto API. We have zero knowledge of your files or passwords.
Because the encryption is genuine and strong, lost passwords cannot be recovered. Be sure to keep a record of your password or retain your original unencrypted file.
No, Files Craft PDF Protector is 100% free with no limits or signups.