Password Protect PDF
Encrypt your PDF with a password to prevent unauthorized access.
Your file stays private. Password encryption is applied locally in your browser using pdf-lib — no uploads, no servers. Set a password and download your protected PDF instantly.
About Password Protect
Secure your sensitive documents by adding a password with our protect tool, keeping your files safe from unauthorized access. To password protect PDF online free, upload your file, enter a strong password, and download the encrypted version instantly. The encryption is applied entirely in your browser using pdf-lib, so your document never leaves your device and no data is transmitted over the network. This is essential for protecting confidential business reports, personal financial documents, legal contracts, or any PDF that contains sensitive information. Once protected, the password must be entered to open the file, giving you full control over who can view it. Encrypt PDF file securely with our fully client-side tool — no data transmission, no server storage, complete privacy guaranteed.