Protect & Unlock PDF
Add strong client-side password encryption to confidential PDFs, or unlock and remove restrictions with your known password. 100% on-device.
Drag & drop a PDF file here, or browse
Encrypt with a new password or unlock an existing protected file. Zero uploads.
document.pdf
Checking encryption status...
Removes all passwords and permission restrictions from the document in your local browser memory.
Processing document security...
Applying client-side cryptography
Security Process Completed!
Encrypted in seconds • zero uploads
Encrypt and protect your PDF documents
AES Encryption
Add strong user and owner passwords with custom permission flags.
Password Removal
Remove security restrictions from authorized PDF documents easily.
Local Key Generation
Passwords are processed locally and never stored or sent anywhere.
How to Encrypt PDF with Password Protection
Follow these 4 simple steps to process your files directly on your device with 100% privacy.
Select PDF
Choose the PDF document to encrypt. The file is held safely in browser memory.
Set Strong Password
Enter an owner password for editing permissions and an optional user password for opening.
Apply Encryption Standard
Standard PDF encryption dictionary is generated locally using WebCrypto.
Download Protected PDF
Save your encrypted PDF. Any recipient will require your password to view or print.
Supported Formats & Processing Limits
Built for Everyday Productivity
Protect Financial Reports & Payroll Summaries
Before sending confidential quarterly earnings, tax summaries, or payroll files over email, protect them with password encryption to prevent unauthorized interception.
Set Separate Open vs Owner Passwords
Allow clients or partners to read a contract without permitting them to alter form fields, extract vector artwork, or modify document terms.
How to Password Protect and Encrypt PDF Documents Securely
Encrypt confidential documents using standard AES-128 and AES-256 cryptographic handlers directly in browser memory.
Frequently Asked Questions
Everything you need to know about browser processing, file safety, and format capabilities.
Can DocuShrink recover my file if I forget the password?
No. Encryption keys are generated mathematically on your device and are never sent to any server. Keep a safe copy of your password.
What encryption standard is applied?
We apply standard PDF password security compatible with Adobe Acrobat Reader, Apple Preview, and modern web browsers.
Are my passwords transmitted across the internet?
Never. The encryption key derivation and byte-scrambling occur exclusively within your browser's WebCrypto subsystem.
Can password-protected PDFs be opened on mobile devices?
Yes. Any modern mobile PDF viewer (iOS Files, Android Drive, Acrobat Reader) natively supports standard PDF password prompts.