PDF Lock (Add Password)

Add password protection to PDF files

Upload PDF File
Select a PDF document to protect with a password

Local Development Only

This tool requires qpdf system binary and works only in local development or custom server deployments. It will NOT work on serverless platforms like Vercel.

For local use:
• Mac: brew install qpdf
• Linux: sudo apt-get install -y qpdf

Recommended alternatives: Adobe Acrobat DC, PDFtk, or online services like tools.aback.ai

Drag and drop a PDF file here, or click to select

How It Works

1. Upload PDF

Select or drag & drop your PDF document

2. Set Password

Create a strong password and confirm it

3. Add Protection

Click to apply password protection

4. Download

Save your password-protected PDF

Recommended Tools for PDF Password Protection

Desktop Software (Free)

  • • PDFtk Free: Command-line tool for PDF password protection
  • • LibreOffice: Export to PDF with password protection
  • • Microsoft Word: Save as PDF with encryption

Desktop Software (Paid)

  • • Adobe Acrobat DC: Professional PDF password encryption with AES-256
  • • PDF Expert (Mac): Easy-to-use password protection

Online Services

  • • Aback Tools: tools.aback.ai - Comprehensive PDF tools including password protection
About PDF Lock

PDF password protection prevents unauthorized access to your documents by requiring a password to open them.

This tool adds password protection to your PDFs, keeping your sensitive information secure. Only users with the correct password will be able to view the document.

Important: Remember to save your password securely. If you lose it, you won't be able to access your PDF.

Privacy: All processing happens in your browser. Your PDF and password never leave your device.