PDF Security
Lock PDF with Password Free — Protect Your Documents
Add modern AES-256 password protection to PDF files in your browser. Optional reader permissions are configured in the output, but PDF permissions remain advisory in some viewers.
Select PDF to protect
⚡ Fast • Max: 100MB • Instant
PDF Locked Successfully!
Your PDF is now password protected
AES-256 encryption runs locally; your PDF is not uploaded. Keep your password safe because it cannot be recovered.