Put a password on your PDF with real AES-256 encryption — without the password the file will not open. Optionally block printing or copying. The file stays in your browser.
Drag one PDF here
or click to choose a file
Keep the password safe: without it the file truly cannot be opened — there is no back door.
All tools run entirely in your browser: nothing is sent to the server. A password-protected PDF will not open here; remove the protection first with the Unlock tool.