100% Local Processing

Lock & Unlock PDF

Password-protect a PDF to restrict access, or remove an existing password from a PDF you own. Entirely in your browser — no upload, no server.

Drop your PDF to lock it

Add password protection — 128-bit AES encryption in your browser

Files stay on device No upload 100% free

PDF Preview

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New Password

Confirm Password

Permissions (owner password required to change)

Allow Printing

Allow Copying Text

Allow Editing / Annotations

pdf-lib uses 128-bit AES encryption. The password never leaves your device.