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Drop a PDF to password protect, or browse
Add a password to your PDF. AES encryption applied locally — files never leave your device.
Drop a PDF to password protect, or browse
Common questions about Encrypt PDF
WhisperDocs uses AES-256 encryption, the same standard used by governments and financial institutions. It is the strongest PDF encryption available.
No. Encryption happens entirely in your browser using the Web Crypto API. Your file never leaves your device.
Yes. You can set a user password to restrict opening and an owner password to control permissions like printing and editing.
Yes — if you know the password, you can open and re-save the PDF without encryption using the same tool.
AES-256 encrypted PDFs cannot be recovered without the password. Store your password safely — WhisperDocs does not retain it.