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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
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Keep the password safe: without it the file truly cannot be opened — there is no back door.
This tool runs entirely in your browser: your PDF is not sent to a server. A password-protected PDF will not open here; remove the protection first with the Unlock tool.