PDF Password Protect

Encrypt your PDF document with a secure password and restrict unauthorized access.

Processing Architecture: Client-Side (Processed locally in your web browser with zero server uploads)

How to Use PDF Password Protect

  1. Step 1: Upload PDF

    Select the PDF file you wish to lock.

  2. Step 2: Enter Password

    Type a strong password and confirm it.

  3. Step 3: Download Encrypted PDF

    Save your password-protected PDF document.

Key Features & Capabilities

  • Client-side password hashing and PDF security tagging
  • Password strength indicator and verification check
  • Ensures documents prompt for password upon opening in Acrobat or browser

Specifications & Limits

  • Supported Formats: .pdf, application/pdf
  • Max File Size: 50 MB
  • Batch Processing: Single Item
  • Free Tier Limit: Standard AES encryption setup

Frequently Asked Questions

Is the password sent to any server?

Never. The encryption instructions and permissions are applied directly in your browser.

What encryption standard is used?

Standard 128-bit / 256-bit AES encryption compliant with modern PDF readers.

Related Tools

  • PDF Unlock — Remove password security and permissions restrictions from PDF files you own.
  • PDF Metadata Remover — Strip hidden author names, creation software, GPS data, and edit history from PDFs.
  • Strong Password Generator — Generate cryptographically secure, randomized passwords with custom length and symbols.