PDF Tool
PDF Lock
Password protect your PDF files with real AES-256 encryption. 100% in-browser — nothing is uploaded.
🔒 Your PDF never leaves your device. 100% in-browser AES-256 encryption.
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How to use this PDF Password Protector
Upload your PDF using the drop zone above. Enter a strong password, confirm it, then click Lock PDF. The encrypted PDF will download instantly to your device.
The entire process happens in your browser using AES-256 encryption. No server, no upload, no account needed.
What this PDF password protector does
- ✓Real AES-256 encryption — Produces a genuinely encrypted PDF — not just instructions.
- ✓Password strength indicator — Visual feedback to ensure your password is strong.
- ✓100% in-browser — Your file never leaves your device for complete privacy.
- ✓User & owner passwords — Sets both user password (to open) and permission controls.
- ✓No sign-up required — Completely free with no account needed.
- ✓Instant download — Encrypted PDF downloads directly after processing.
Common use cases
- •Protect confidential business documents with strong passwords
- •Secure personal documents like tax returns and financial statements
- •Add password protection to client deliverables and contracts
- •Secure sensitive legal documents before sharing via email
- •Protect employee records and HR documents
- •Add security to academic papers and research documents