Protect PDF Files with Password Encryption

Encrypt your confidential PDF documents with strong AES-256 military-grade or AES-128 password protection in seconds.

Drop your PDF file here to password protect
Strong AES-256 encryption • 100% In-Memory & Private • Up to 100MB • Free

How to Password Protect PDF Files in 3 Simple Steps

Lock your documents with unbreakable AES-256 encryption.

1

Upload Your PDF File

Drag and drop your confidential PDF file into the secure workspace.

2

Set & Confirm Password

Type a strong password and verify it with the real-time strength meter.

3

Encrypt & Download

Click "Protect & Download PDF" to receive your password-encrypted document immediately.

Frequently Asked Questions About PDF Protection

Learn more about password encryption and document security.

How does PDF password protection work on PDFRack?+
PDFRack encrypts your document using industry-standard AES 256-bit or 128-bit encryption. Anyone opening the file must enter the password to view its contents.
What encryption standards are supported?+
PDFRack supports AES-256 (Military-grade maximum security) and AES-128 (Standard high-security compatibility across all PDF readers).
Does PDFRack store or remember my document password?+
Never. Passwords and files are processed strictly in memory and purged immediately. PDFRack never logs, reads, or retains your passwords or document contents.
Will the protected PDF work on mobile devices and all PDF readers?+
Yes! AES encryption is natively supported by Adobe Acrobat, Apple Preview, Google Chrome, Microsoft Edge, iOS Files, Android PDF viewers, and all standard PDF software.
Is there any fee or file limit to password protect PDFs?+
No. PDFRack Protect PDF is 100% free with unlimited document size up to 100MB and zero daily quotas.